BS EN 288-9
Content
BRITISH STANDARD
Specification and
approval of welding
procedures for metallic
materials Ð
Part 9: Welding procedure test for
pipeline welding on land and offshore
site butt welding of transmission
pipelines
The European Standard EN 288-9:1999 has the status of a
British Standard
ICS 25.160.10
NO COPYING WITHOUT BSI PERMISSION EXCEPT AS PERMITTED BY COPYRIGHT LAW
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BS EN
288-9:1999
BS EN 288-9:1999
National foreword
This British Standard is the English language version of EN 288-9:1999.
The UK participation in its preparation was entrusted by Technical Committee
WEE/21, Pipework welding, to Subcommittee WEE/21/7, Field welding, which has
the responsibility to:
Ð aid enquirers to understand the text;
Ð present to the responsible European committee any enquiries on the
interpretation, or proposals for change, and keep the UK interests informed;
Ð monitor related international and European developments and promulgate
them in the UK.
A list of organizations represented on this subcommittee can be obtained on request
to its secretary.
Cross-references
The British Standards which implement international or European publications
referred to in this document may be found in the BSI Standards Catalogue under the
section entitled ªInternational Standards Correspondence Indexº, or by using the
ªFindº facility of the BSI Standards Electronic Catalogue.
A British Standard does not purport to include all the necessary provisions of a
contract. Users of British Standards are responsible for their correct application.
Compliance with a British Standard does not of itself confer immunity
from legal obligations.
Summary of pages
This document comprises a front cover, an inside front cover, the EN title page,
pages 2 to 19 and a back cover.
The BSI copyright notice displayed throughout this document indicates when the
document was last issued.
This British Standard, having
been prepared under the
direction of the Engineering
Sector Committee, was published
under the authority of the
Standards Committee and comes
into effect on 15 August 1999
BSI 08-1999
ISBN 0 580 32580 6
Amendments issued since publication
Amd. No.
Date
Comments
EN 288-9
EUROPEAN STANDARD
NORME EUROPEÂENNE
EUROPAÈISCHE NORM
March 1999
ICS 25.160.10
English version
Specification and approval of welding procedures for metallic
materials Ð Part 9: Welding procedure test for pipeline welding on
land and offshore site butt welding of transmission pipelines
Descriptif et qualification d'un mode opeÂratoire de
soudage pour les mateÂriaux meÂtalliques Ð
Partie 9: Epreuve de qualification d'un mode
opeÂratoire de soudage pour le soudage bout a bout
de canalisations de transport sur site, sur terre et
en mer
Anforderung und Anerkennung von
Schweiûverfahren fuÈr metallische Werkstoffe Ð
Teil 9: SchweiûverfahrenspruÈfung fuÈr
baustellengeschweiûte StumpfnaÈhte von
Versorgungsrohrleitungen an Land und Offshore
This European Standard was approved by CEN on 3 March 1999.
CEN members are bound to comply with the CEN/CENELEC Internal Regulations
which stipulate the conditions for giving this European Standard the status of a
national standard without any alteration. Up-to-date lists and bibliographical
references concerning such national standards may be obtained on application to
the Central Secretariat or to any CEN member.
This European Standard exists in three official versions (English, French, German).
A version in any other language made by translation under the responsibility of a
CEN member into its own language and notified to the Central Secretariat has the
same status as the official versions.
CEN members are the national standards bodies of Austria, Belgium, Czech
Republic, Denmark, Finland, France, Germany, Greece, Iceland, Ireland, Italy,
Luxembourg, Netherlands, Norway, Portugal, Spain, Sweden, Switzerland and
United Kingdom.
CEN
European Committee for Standardization
Comite EuropeÂen de Normalisation
EuropaÈisches Komitee fuÈr Normung
Central Secretariat: rue de Stassart 36, B-1050 Brussels
1999 CEN All rights of exploitation in any form and by any means reserved worldwide for CEN national
Members.
Ref. No. EN 288-9:1999 E
Page 2
EN 288-9:1999
Foreword
This European Standard has been prepared by
Technical Committee CEN/TC 121, Welding, the
Secretariat of which is held by DS.
This European Standard shall be given the status of a
national standard, either by publication of an identical
text or by endorsement, at the latest by
September 1999, and conflicting national standards
shall be withdrawn at the latest by September 1999.
According to the CEN/CENELEC Internal Regulations,
the national standards organizations of the following
countries are bound to implement this European
Standard: Austria, Belgium, Czech Republic, Denmark,
Finland, France, Germany, Greece, Iceland, Ireland,
Italy, Luxembourg, Netherlands, Norway, Portugal,
Spain, Sweden, Switzerland and the United Kingdom.
Contents
Foreword
Introduction
1
Scope
2
Normative references
3
Definitions
3.1 repair
3.2 full penetration repair
3.3 internal repair
3.4 make
4
Preliminary welding procedure
specification (pWPS)
5
Welding procedure test
6
Test piece
6.1 General
6.2 Shape and dimensions of test pieces
6.3 Welding of test pieces
7
Examination and testing
7.1 Extent of testing
7.2 Location and cutting of test specimens
7.3 Non-destructive examination
7.4 Destructive tests
7.5 Re-testing
8
Range of approval
8.1 General
8.2 Related to the manufacturer
8.3 Related to the material
8.4 Common to all welding procedures
8.5 Specific to processes
8.6 Period of validity
9
Wedling procedure approval record
(WPAR)
Annex A (normative) Repairs
Annex B (informative) A-deviations
Annex C (informative) Welding procedure
approval record form
Page
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BSI 08-1999
Page 3
EN 288-9:1999
Introduction
2 Normative references
All new welding procedure approvals are in
accordance with this standard from the date of its
issue.
However, this standard does not invalidate previous
welding procedure approvals made to former national
standards or specification, providing the intent of the
technical requirements is satisfied and the previous
procedure approvals are relevant to the application
and production work on which they are employed.
Also, where additional tests are carried out to make
the welding procedure approval technically equivalent,
the additional tests are made on a test piece which
should be made in accordance with this standard.
Consideration of previous procedure approvals to
former national standards or specifications should be
made at the time of the enquiry or contract stage and
agreed between the contracting parties.
This European Standard incorporates by dated or
undated reference, provisions from other publications.
These normative references are cited at the
appropriate places in the text and the publications are
listed hereafter. For dated references, subsequent
amendments to or revisions of any of these
publications apply to this European Standard only
when incorporated in it by amendment or revision. For
undated references the latest edition of the publication
referred to applies.
EN 288-1, Specification and approval of welding
procedures for metallic materials Ð Part 1: General
rules for fusion welding.
EN 288-2, Specification and approval of welding
procedures for metallic materials Ð Part 2: Welding
procedure specification for arc welding.
EN 439, Welding consumables Ð Shielding gases for
arc welding and cutting.
EN 760, Welding consumables Ð Fluxes for submerged
arc welding Ð Classification.
EN 875, Destructive tests on welds in metallic
materials Ð Impact tests Ð Test specimen location,
notch orientation and examination.
EN 895, Destructive tests on welds in metallic
material Ð Tranverse tensile test.
EN 970, Non-destructive examination of welds Ð
Visual examination.
EN 1043-1, Destructive test on weld in metallic
materials Ð Hardness testing Ð Part 1: Hardness
test on arc welded joints.
EN 1290, Non-destructive examination of welds Ð
Magnetic particle examination of welds.
EN 1321, Destructive test on welds in metallic
materials Ð Macroscopic and microscopic
examination of welds.
EN 1435, Non-destructive examination of welds Ð
Radiographic examination of welded joints.
EN 1714, Non-destructive examination of welds Ð
Ultrasonic examination of welded joints.
EN ISO 6947, Welds Ð Working positions Ð
Definitions of angles of slope and rotation.
(ISO 6947:1993)
EN 10045-1, Metallic materials Ð Charpy impact
test Ð Part 1: Test method.
EN 24063, Welding, brazing, soldering and braze
welding of metals Ð Nomenclature of processes
and reference numbers for symbolic representation
on drawings.
(ISO 4063:1990)
EN ISO 6520-1:1998, Welding and applied processes Ð
Classification of geometric imperfections in metallic
materials Ð Part 1: Fusion welding.
(ISO 6520-1:1998)
CR 12187, Welding Ð Guidelines for a grouping
system of materials for welding purposes.
1 Scope
This standard specifies how a welding procedure
specification is approved by welding procedure tests
for on land and offshore site butt welding of
transmission pipelines under normal atmospheric
conditions.
Tests are carried out in accordance with this standard
unless additional tests (e.g. CTOD tests and all weld
metal tensile tests) are specified by the relevant
application standard or contract when these apply.
This standard defines the conditions for the execution
of welding procedure approval tests and the limits of
validity of an approved welding procedure for all
practical welding operations within the range of
variables listed in clause 8.
It applies to the arc welding of steels of groups 1, 2
and 3 according to CR 12187. The principles of this
standard can be applied to other fusion welding
processes subject to agreement between the
contracting parties.
The requirements for welding procedure specification
and qualification for hyperbaric and ªwetº welding are
not covered by this supplementary standard.
Arc welding is covered by the following processes in
accordance with EN 24063:
111 Ð metal-arc welding with covered electrode;
114 Ð flux-cored wire metal-arc welding without
gas shield;
121 Ð submerged arc welding with wire
electrode;
131 Ð metal-arc inert gas welding, MIG-welding;
135 Ð metal-arc active gas welding, MAG-welding;
136 Ð flux-cored wire metal-arc welding with
active gas shield;
141 Ð tungsten inert gas arc welding,
TIG-welding.
Other fusion welding processes by agreement e.g.
metal cored wire arc welding.
BSI 08-1999
Page 4
EN 288-9:1999
3 Definitions
For the purposes of this standard, the definitions listed
below and in EN 288-1 apply.
3.1
repair
any operation which involves welding to rectify the
weld, outside the normal welding cycle
3.2
full penetration repair
welded repair through the whole thickness of the
qualification joint
3.3
internal repair
welded repair carried out from the inside surface or
the root side of a weld, after excavation and
repreparation, using either a single or a multi-pass
weld deposition sequence
3.4
make
specific trade or brand name of the consumable, but
not its designation
4 Preliminary welding procedure
specification (pWPS)
The preliminary welding procedure specification shall
be prepared in accordance with EN 288-2. It shall
specify the range for all relevant parameters including
the following additional items:
Ð steel grade and supply conditions
(N, TM, QT steels);
Ð number and location of welders;
Ð time lapse between start of root pass and start of
hot pass;
Ð partially completed joint: number of runs before
the joint is permitted to cool to ambient
temperature;
Ð type of line up clamp;
Ð time of clamp removal;
Ð number of runs completed before lowering off or
barge move up;
Ð preheating method;
Ð method to control cooling.
5 Welding procedure test
The making and testing of test pieces representing the
type of welding used in production shall be carried out
in accordance with clauses 6 and 7 of this standard.
When a welding procedure is to be qualified and
approved for pipe-reeling, the proposed welding
procedures shall include relevant previously
documented strain ageing data and/or any additional
tests specified.
NOTE These tests can include representative strain cycles and
accelerated ageing typically for 1 h at 1008 C.
Where data regarding pipe material performance/weldability
exist, these data shall be considered when selecting
suitable welding parameters and conditions for
incorporating into the pWPS. Where such data do not
exist it can be necessary to carry out preliminary
welding trials to establish these data.
The welder who undertakes the welding procedure test
satisfactorily in accordance with this standard can be
approved, by agreement between the contracting
parties, for welding on site within the ranges covered
by the approved welding procedure specification.
6 Test piece
6.1 General
The welded assembly to which the welding procedure
will relate in production shall be represented by
making a standardized test piece or pieces, as specified
in 6.2.
6.2 Shape and dimensions of test pieces
Test welds shall be made between whole pipe lengths
(if agreed between the contracting parties the length
could be reduced to a minimum of one diameter)
under simulated site conditions (this may include the
application of installation strains). Welding shall follow
the pWPS, with removal of line-up clamps, lowering
off, partial completion and recommencement where
applicable.
6.3 Welding of test pieces
Preparation and welding of test pieces shall be carried
out in accordance with the pWPS, and under the
general conditions of production welding which they
shall represent. Welding positions and limitations for
the angle of slope and rotation of test piece shall be in
accordance with EN ISO 6947 (see also 8.4.2).
If tack welds are to be fused into the final joint they
shall be included in the test piece.
Welding and testing of the test pieces shall be
witnessed by an examiner or examining body.
7 Examination and testing
7.1 Extent of testing
The testing includes both non-destructive examination
(NDE) and destructive testing which shall be carried
out in accordance with the requirements of Table 1.
When Charpy impact tests are specified for welds
exceeding 20 mm thick, they are required at two
different thickness locations (see 7.4.3).
Repairs outside essential variables need full approval
in accordance with annex A.
7.2 Location and cutting of test specimens
The location of test specimens shall be in accordance
with Figures 1 and 2.
Test specimens shall be taken after non-destructive
examination (NDE) has shown satisfactory results. It is
permitted to take the test specimens from locations
avoiding areas showing acceptable imperfections.
BSI 08-1999
Page 5
EN 288-9:1999
Table 1 Ð Examination and testing of the test pieces
Test piece
Butt-weld
Type of test
Visual examination (EN 970)
Radiographic examination (EN 1435) or
Ultrasonic examination (EN 1714)
Surface crack detection
Transverse tensile test (EN 895)
Impact test (EN 875)
Hardness test (EN 1043-1)
Macro-examination (EN 1321)
Extent of testing
Note
100%
Ð
100 %
100 %
2 test specimens
2 or 4 sets
required
1 test specimen
Ð
1
Ð
2
3
Ð
NOTE 1 Magnetic particle examination according to EN 1290.
NOTE 2 1 set in the weld metal and 1 set in the HAZ at each location. See also 7.4.3.
NOTE 3 Not required for parent metals in ferritic steels with Rm # 430 N/mm2 (Re # 275 N/mm2).
Figure 1 Ð Location of test specimens for a butt-weld in pipe Ð Upwards welding
BSI 08-1999
Page 6
EN 288-9:1999
Figure 2 Ð Location of test specimens for a butt-weld in pipe Ð Downwards welding
7.3 Non-destructive examination
7.3.1 Method
After any required post-weld heat treatment and prior
to the cutting of test specimens, all test pieces shall be
examined visually and non-destructively in accordance
with 7.1.
For non-post-weld heat treated test pieces, account
should be taken of the materials susceptibility to
hydrogen induced cracking and consequently the NDE
should be delayed. The NDE delay shall be 24 h, unless
agreed by the contracting parties or by the relevant
application standard.
7.3.2 Acceptance levels
A welding procedure is approved if the imperfections
in the test piece are within the specified limits given in
Table 2.
7.4 Destructive tests
For welds carried out by cellulosic coated electrodes, a
degassing heat treatment of 250 8C of up to 16 h can be
carried out, if necessary according to special
requirements.
7.4.1 Transverse tensile testing
Tests specimens and testing for transverse tensile
testing for butt joints shall be in accordance
with EN 895.
For pipes > 50 mm outside diameter, the weld
reinforcement shall be removed on both faces to give
the test specimen a thickness equal to wall thickness
of the pipe.
Transverse tensile test is acceptable if the test
specimen breaks in the parent material or when it
breaks in the weld metal with a tensile strength equal
to or greater than the specified minimum tensile
strength of pipe material.
7.4.2 Macro-examination
Test specimens and testing for macro examination shall
be in accordance with EN 1321.
The acceptance levels stated in 7.3.2 shall apply.
7.4.3 Impact testing
In the absence of an application standard, impact
testing is required for pipes with specified impact
properties and wall thicknesses t $ 12 mm.
Test specimens shall be taken and prepared in
accordance with EN 10045-1 in such a way that the
axis of the notch is perpendicular to the pipe surface.
Test specimens and testing for impact test shall be in
accordance with this standard for position and
temperature of testing, and with EN 875 for dimensions
and testing.
For weld metal, test specimen type VWT0 and for HAZ
specimen type VHT0 shall be used (see Figure 3).
From each specified position, each set shall be
comprised of three test specimens.
Test specimens with Charpy V-notch shall be used and
sampled from 1 mm to 2 mm below the inner surface
of the pipe and transverse to the weld.
When the pipe wall thickness exceeds 20 mm, two
more sets are required, in the same circumferential
locations, but taken within 1 mm to 2 mm of the
outside surface of the pipe.
Test temperature and absorbed energy shall be in
accordance with the specified design requirements for
the complete product, provided the requirements laid
down by the application standard are met.
BSI 08-1999
Page 7
EN 288-9:1999
Table 2 Ð Limits for imperfections
Imperfection designation
Cracks
EN ISO 6520-1:
1998 reference
100
Limits for imperfections
Not permitted
Gas pore
Uniformly distributed porosity
Linear porosity
Elongated cavity
Surface pore
2011
2012
2014
2016
2017
Individual gas pores or uniformly distributed
porosity shall be unacceptable when any of
the following conditions exists:
a) the size of an individal pore
exceeds 3 mm;
b) the size of an individal pore exceeds 25 %
of the thinner of the nominal wall thickness
joined;
c) the total area, when projected radially
through the weld shall not exceed 2 % of the
projected weld area in the radiograph,
consisting of the length of the weld affected
by the porosity, with a minimum length
of 150 mm multiplied by the maximum width
of the weld.
Localized (clustered) porosity
2013
Ð Clustered porosity that occurs in any
pass except the finish pass shall comply
with the criteria of gas pores.
Ð Clustered porosity that occurs in the
finish pass shall be unacceptable when any
of the following conditions exists:
a) the diameter of the clustered porosity
exceeds 13 mm;
b) the aggregate length of clustered
porosity in any continuous 300 mm length
of weld exceeds 13 mm;
c) an individual pore within a clustered
porosity exceeds 2 mm in size.
Elongated cavity
2015
Unacceptable in the root pass when any of the
following conditions exists:
a) the length of an individual indication
exceeds 50 mm;
b) the aggregate length of the elongated
cavities in any continuous 300 mm length of
weld exceeds 50 mm;
c) the aggregate length of the elongated
cavities exceeds 15 % of the weld length.
Crater pipe
2024
Unacceptable when the maximum length
exceeds 2 mm or 30 % of the wall thickness,
whichever is the smaller.
BSI 08-1999
Page 8
EN 288-9:1999
Table 2 Ð Limits for imperfections (continued)
Imperfection designation
Slag inclusion:
Ð linear
Ð isolated
EN ISO 6520-1:
1998 reference
301
3011
3012
Limits for imperfections
Unacceptable when any of the following
conditions exists:
a) the length of a linear slag inclusion
exceeds 50 mm;
NOTE Parallel linear indications separated by
approximately the width of the root run (wagon
tracks) should be considered as single indications
unless the width of either of them exceeds 0,8 mm. In
that case, they should be considered as separate
indications.
Metallic inclusions:
Ð tungsten
Ð copper
304
3041
3042
Lack of fusion:
Ð lack of side wall fusion
Ð lack of inter-run fusion
401
4011
4012
b) the aggregate length of linear slag
inclusions in any continuous 300 mm length
of weld exceeds 50 mm;
c) the width of a linear slag inclusion
exceeds 1,6 mm;
d) the aggregate length of isolated slag
inclusions in any continuous 300 mm length
of weld exceeds 50 mm;
e) the width of an isolated slag inclusion
exceeds 3 mm or 50 % of the wall thickness,
whichever is less;
f) more than four isolated slag inclusions
with the maximum width of 3 mm are
present in any continuous 300 mm length of
weld;
g) the aggregate length of linear and isolated
slag inclusions exceeds 15 % of the weld
length.
Unacceptable when any of the following
conditions exists:
a) the size of a copper or tungsten inclusion
exceeds 3 mm or 50 % of the wall thickness,
whichever is the smaller;
b) the aggregate length of copper or
tungsten inclusions exceeds 12 mm in any
continuous 300 mm length of weld or more
than four such inclusions are present in any
continuous 300 mm length of weld.
Unacceptable when any of the following
conditions exists:
a) the length of an individual indication
exceeds 50 mm
b) the aggregate length of indications in any
continuous 300 mm length of weld exceeds
50 mm;
c) the aggregate length of indications
exceeds 15 % of the weld length.
BSI 08-1999
Page 9
EN 288-9:1999
Table 2 Ð Limits for imperfections (continued)
Imperfection designation
EN ISO 6520-1:
1998 reference
Ð lack of fusion at the root of the weld
4013
Lack of penetration (incomplete penetration)
402
Undercut
Undercut
Shrinkage groove
Excess weld metal
Excessive penetration
BSI 08-1999
5011
5012
5013
502
504
Limits for imperfections
Unacceptable, for single sided welds, when
any of the following conditions exists:
a) the length of an individual indication
exceeds 25 mm;
b) the aggregate length of indications in any
continuous 300 mm length of weld exceeds
25 mm;
c) the aggregate length of indications
exceeds 8 % of the weld length in any weld
less than 300 mm long.
Unacceptable when any of the following
conditions exists:
a) the length of an individual indication of
incomplete penetration exceeds 25 mm;
b) the aggregate length of indications of
incomplete penetration in any continuous
300 mm length of weld exceeds 25 mm;
c) the aggregate length of indications of
incomplete penetration exceeds 8 % of the
weld length in any weld less than 300 mm
long;
d) incomplete penetration in double sided
welds exceeds 50 mm in total length in any
continuous 300 mm of weld length or 15 %
of the weld length.
Unacceptable when any of the following
conditions exists:
a) the aggregate length of undercut, both
external and internal, in any continuous
300 mm length of weld exceeds 50 mm;
b) the aggregate length of undercut, both
external and internal, exceeds 15 % of the
weld length.
Undercuts shall not be deeper than 1,5 mm or
10 % of the pipe wall thickness, whichever is
the smaller.
Both external and internal reinforcement
should not exceed a height of more than
3 mm.
Page 10
EN 288-9:1999
Table 2 Ð Limits for imperfections (continued)
Imperfection designation
Linear misalignment
EN ISO 6520-1:
1998 reference
507
Limits for imperfections
Ð Maximum external misalignment permitted:
Ð for t # 10 mm
: 0,3 t;
Ð for 10 mm < t # 20 mm : 3 mm;
Ð for t > 20 mm
: 0,125 t.
Ð Maximum internal misalignment permitted:
Ð 1 mm on entire circumference;
Ð 2 mm over length D;
Ð 2,5 mm over length 1/3 D.
Sagging in flat (PA) or overhead (PE)
Burn through
5092
510
Unacceptable.
Unacceptable when any of the following
conditions exists:
a) the maximum dimension exceeds 6 mm
and the density of the burn through of the
radiographic image exceeds that of the
thinnest adjacent parent metal;
b) the maximum dimension exceeds the
thinner of the nominal wall thicknesses
joined, and the density of the burn through
of the radiographic image exceeds that of
the thinnest adjacent parent metal;
c) more than one burn through of any size
is present and the density more than one of
the radiographic images exceeds that of the
thinnest adjacent parent metal.
Unacceptable.
Incompletely filled grove
511
Root concavity
515
Root concavity up to 25 % of the total length
of weld, is acceptable, provided the density of
the radiographic image of the root concavity
does not exceed that of the thinnest adjacent
parent metal. For areas that exceed the density
of the thinnest adjacent parent metal, the
criteria for burn through (510) are applicable.
Accumulation of imperfections
Ð
Any accumulation of imperfections shall be
unacceptable when any of the following
conditions exists:
a) the aggregate length of indications in any
continuous 300 mm length of weld exceeds
50 mm;
b) the aggregate length of indications
exceeds 15 % of the weld length.
BSI 08-1999
Page 11
EN 288-9:1999
Dimensions in millimetres
Figure 3a Ð For all wall thicknesses
Figure 3b Ð Additional for wall thicknesses > 20 mm
Figure 3 Ð Position of Charpy-V notch test specimens
7.4.4 Hardness testing
The hardness testing shall be in accordance
with EN 1043-1. The Vickers method HV10 shall be
used. The indentation shall be made in the weld, the
HAZs and the parent metal with the object of
measuring and recording the range of values in the
weld joint. This will include rows of indentation one of
which shall be 2 mm maximum below each surface.
For each row of indentation there shall be a minimum
of three individual indentations in each part of the
weld, the HAZ (both sides) and the parent metal (both
sides).
For the HAZ the first indentation shall be placed as
close to the fusion line as possible.
The results from the hardness test shall meet the
requirements given in Table 3.
7.5 Re-testing
If the test piece fails to comply with any of the
requirements for visual examination or NDE specified
in 7.3.2, one further test piece shall be welded and
subjected to the same examination. If this additional
test piece does not comply with the relevant
requirements, the pWPS shall be regarded as not
capable of complying with the requirements of this
standard without modification.
If any test specimen fails to comply with the relevant
requirements of 7.4 only due to geometric weld
imperfections, two further test specimens shall be
obtained for each one that failed. These can be taken
from the same test piece if there is sufficient material
available or from a new test piece, and shall be
subjected to the same test.
If either of these additional test specimens does not
comply with the relevant requirements, the pWPS shall
be regarded as not capable of complying with the
requirements of this standard without modification.
Table 3 Ð Permitted maximum hardness values HV10
Hardness location
Weld metal
Root
Heat-affected zone
Cap
Root
Cap
Sour service, any process:
t < 9,5 mm;
t $ 9,5 mm.
250
250
275
275
250
250
275
300
Non-sour service:
Ð manual welding with cellulosic electrodes;
Ð other welding processes.
275
275
275
275
275
350
325
350
BSI 08-1999
Page 12
EN 288-9:1999
8 Range of approval
8.1 General
All the conditions of validity stated below shall be met
independently of each other.
Changes outside of the ranges specified shall require a
new welding procedure test.
8.2 Related to the manufacturer
An approval of a WPS obtained by a manufacturer is
valid in workshops or sites under the same technical
and quality control of that manufacturer.
8.3 Related to the material
8.3.1 Parent metal
A welding procedure test carried out with one of the
steel grades of a group covers for steel grades with
lower or equal specified minimum yield strength of
that group but does not cover steel grades with higher
specified minimum yield strength.
A change of supply conditions requires a reapproval of
the welding procedure test in all cases.
In addition a reapproval of the welding procedure test
is required, if the ladle analysis differs from that tested
by more than the amount defined in Table 4:
Ð for group 1.1 steels when CTOD test is required;
Ð for groups 1.2 and 1.3 steels when either impact
test or CTOD test is required;
Ð for groups 2 and 3 steels.
8.3.1.1 Grouping system
Steel grades are grouped in accordance with CR 12187
(groups 1, 2 and 3).
Table 4 Ð Qualified ranges of chemical analysis
Element
Part 1
Part 24)
Part 35)
Value tested
Values qualified
Value tested ±0,04 %
Value tested ±0,25 %
Value tested ±0,20 %
Up to 0,015 % over the value tested
Not less than 0,009 %, up to 0,015 %
over the value tested
Up to 0,015 % over value tested
Value tested 20,06 % or +0,03 %2)3)
Carbon
Manganese
Silicon
Sulfur
Any
Any
Any
Not over 0,008 %
Over 9,008 %
Phosphorus
Carbon equivalent1)
Any
Any
Aluminium(tot)
Not over 0,015 %
Over 0,015 %
Niobium
Vanadium
Nickel
Copper
Chromium
Molybdenum
Titanium
Any
Any
Any
Any
Any
Any
Any
Not less than value tested
Value tested ±0,030 % but shall be
between 0,016 % and 0,060 %
Value tested 20,02 % or +0,01 %
Value tested ±0,03 %
Value tested ±0,10 %
Value tested 20,20 % or +0,10 %
Value tested 20,10 % or +0,05 %
Value tested 20,10 % or +0,05 %
Value tested ±0,005 %
Nitrogen
Calcium
Any
Not over 0,004 %
Over 0,004 %
Value tested +0,004 %
Not over 0,004 %
Not over value tested
1)
Carbon equivalent = % C + % Mn/6 + (% Cr + % Mo + % V)/5 + (% Ni + % Cu)/15.
2)
The client may specify a lower maximum for sour service.
3)
For steels of carbon equivalent $ 0,4 % increase preheat can be needed
4)
The ªvalues qualifiedº limits in this part apply only where impact testing is required, or where the material tested has a carbon
equivalent exceeding 0,43 %
5) Measurement of elements of this part is not required unless CTOD testing is required and the material tested has a carbon
equivalent exceeding 0,40 %.
BSI 08-1999
Page 13
EN 288-9:1999
8.3.2 Parent metal thickness and pipe diameter
8.3.2.1 Thickness
The approval of a welding procedure test on
thickness t shall include approval for thicknesses in the
following ranges given in Table 5, provided this does
not conflict with the impact test requirements
of 7.4.3.
8.3.2.2 Pipe diameter
The approval of a welding procedure test on outside
diameter D shall include approval for diameters in the
range 0,5 D to 2 D.
8.4 Common to all welding procedures
8.4.1 Welding process
The approval is valid only for the welding process used
in the welding procedure test. In a multi-process
procedure the approval is only valid for the order used
in the welding procedure test.
8.4.2 Welding positions
The range of approval for welding position is ±258 of
the position tested, except for position PA according to
EN ISO 6947 which is qualified by position PF or PG.
8.4.3 Type of joint
Any change in joint configuration outside tolerances
specified in the WPS requires a reapproval of the
welding procedure test.
8.4.4 Filler metal designation
Where the filler metal designation is based on tensile
or yield strengths the approval of one filler metal shall
approve the others within the same specified group
except where impact properties are required to be
demonstrated.
Where the filler metal designation is based on chemical
composition the approval of one filler metal shall
approve others within the same specified chemical
group.
A change of type of coating or flux e.g. basic/rutile/cellulosic
shall entail reapproval of the welding procedure.
8.4.5 Filler metal make
When impact testing is required, the approval given is
only applicable to the specific make used in the
welding procedure test. It is permissible to change the
specific make of filler metal to another with the same
compulsory part of the classification when an
additional test piece is welded.
This test piece shall be welded using the identical
welding parameters as the original weld procedure test
and only weld metal impact test specimens shall be
tested.
NOTE This provision does not apply to solid wire and rods with
the same classification and nominal chemical compositions.
8.4.6 Type of current
The approval given is the type of current (a.c., d.c.,
pulsed current) and the polarity used in the welding
procedure test.
8.4.7 Heat input
The requirements of this clause only apply when the
control of heat input is specified.
When impact requirements apply, the upper limit of
heat input approved is 15 % greater than that used in
the welding procedure test.
The lower limit of heat input approved is 15 % lower
than that used in the welding procedure test.
8.4.8 Preheat temperature
The lower limit of approval is the preheat temperature
used in the welding procedure test.
8.4.9 Interpass temperature
The upper limit of approval is the interpass
temperature used in the welding procedure test and
shall not exceed 250 8C.
8.4.10 Post-heating
When post-heating is carried out as a part of the WPS,
the time and the temperature of the post-heating shall
be not less than those reached in the welding
procedure test.
8.4.11 Post-weld heat-treatment
Addition or deletion of post-weld heat-treatment is not
permitted.
The temperature range approved is the holding
temperature used in the welding procedure test ±20 8C
unless otherwise specified. Where required, heating
rates, cooling rates and holding time shall be related to
the production assembly.
8.4.12 Removal of line up clamp
The line up clamp shall not be removed when the
length of weld (in % of circumference) or number of
runs is less than that reached in the welding procedure
test.
Table 5 Ð Range of approval for thickness
Dimensions in millimetres
Thickness of the test piece t
3 < t # 12
12 < t # 100
BSI 08-1999
Range of approval
Steel
Steel
Steel
Re # 275 N/mm2
275 < Re # 360 N/mm2
Re = 360 N/mm2
3 to 2 t
0,8 t to 1,5 t
0,8 t to 1,25 t
0,5 t to 2 t (max. 150)
0,8 t to 1,5 t
0,8 t to 1,25 t
Page 14
EN 288-9:1999
8.4.13 Time interval
The requirements of this clause shall only apply when
cellulosic electrodes are used.
The approval given is restricted to time lapses not
exceeding that recorded in the welding procedure test.
8.4.14 Number of welders
The approval given is restricted to the minimum
number of root run and hot pass welders used in the
welding procedure test.
The number of welders used for filling passes can be
different but shall at least be equal to that recorded in
the welding procedure test.
8.4.15 Partially completed joint
The approval given is restricted to welds which have at
least as many runs deposited before cooling below
preheat temperature as recorded in the welding
procedure test.
8.5 Specific to processes
8.5.1 Processes 111 and 114
The approval given is for the diameter of electrode
used in the welding procedure test plus or minus one
electrode diameter size for each run, with the
exception of the two first layer and the capping layer
on single sided without backing butt-welds for which
no size change is permissible.
8.5.2 Process 121
The approval given is restricted to the wire system and
wire diameters used in the welding procedure test
(e.g. single-wire or multiple-wire system).
The approval given for the flux is restricted to the
make and classification according to EN 760 used for
the procedure welding test.
8.5.3 Processes 131, 135 and 136
The approval given to the face and/or back shielding
gas is restricted to the type of gas (nominal
composition) according to EN 439 used in the welding
procedure test.
The approval given is restricted to the wire system
used in the welding procedure test (e.g. single-wire or
multiple-wire system).
8.5.4 Process 141
The approval given to the face and/or back shielding
gas is restricted to the type of gas (nominal
composition) according to EN 439 used in the welding
procedure test.
A test made without back shielding gas covers welding
back shielding gas.
8.5.5 Face shielding gas flow rate
For processes 131, 135, 136, and 141 the face shielding
gas flow rate shall not change by more than 10 %.
8.6 Period of validity
The period of use of a WPAR is unlimited.
9 Welding procedure approval
record (WPAR)
The welding procedure approval record (WPAR) is a
statement of the results of assessing each test piece
including re-tests. The relevant items listed for the WPS
in EN 288-2 shall be included, together with details of
any features that would be rejectable by the
requirements of clause 7. If no rejectable features or
unacceptable test results are found, a WPAR detailing
the welding procedure test piece results is approved
and shall be signed and dated by the examiner or
examining body.
A WPAR-format shall be used to record details for the
welding procedure and the test results, in order to
facilitate uniform presentation and assessment of the
data.
An example of the WPAR-format is shown in annex C.
BSI 08-1999
Page 15
EN 288-9:1999
Annex A (normative)
Repairs
Before beginning production, the contractor shall
qualify the weld repair procedure applicable to
groups 2 and 3 steels according to CR 12187.
For a joint made in accordance with 6.3, and which
has been or is subsequently shown to be as
satisfactory, in accordance with Table 1, the procedures
shall include two types of repair:
Ð a full penetration repair;
Ð an internal repair if the pipe diameter allows it.
The groove for the repairs shall be made in the axis of
the weld, and located according to Figures A.1 and A.2.
NOTE Rotation of the pipe is permissible to avoid overlap with
the main weld procedure testing.
The testings shall be carried out in accordance
with 7.3 and 7.4.
Figure A.1 Ð Location of type of repairs Ð Upwards welding
Figure A.2 Ð Location of type of repairs Ð Composite welding
(root pass upwards, filling downwards)
BSI 08-1999
Page 16
EN 288-9:1999
Annex B (informative)
A-deviations
A-deviation: National deviation due to regulations, the
alteration of which is for the time being outside the
competence of the CEN/CENELEC member.
This European Standard falls under Directive 97/23.
NOTE (from CEN/CENELEC Internal Regulations Part 2:1994, 3.1.9):
Where standards fall under EU Directives, it is the view of the
Commission of the European Communities (OJ No C 59, 9.3.1982)
that the effect of the decision of the Court of Justice in case
815/79 Cremonini/Vrankovich (European Court Reports 1980, p.
3583) is that compliance with A-deviations is no longer mandatory
and that the free movement of products complying with such a
standard should not be restricted within the EU except under the
safeguard procedure provided for the relevant Directive.
A-deviations in an EFTA country are valid instead of
the relevant provisions of the European Standard in
that country until they have been removed.
Clause A-deviation
SWEDEN
7.3.2
According to Ordinance AFS 1994:39
concerning ªPressure Vesselsº issued by the
National Swedish Board of Occupational
Safety and Health, chapter 4, sections 6, 11
and 12, the clauses which cause the request of
A-deviations are the following:
In Table 2, for linear misalignment (507),
change the limits given by the following ones:
Ð maximum external misalignment
permitted:
Ð for t # 5 mm : 0,5 t, max. 1 mm;
Ð for 5 mm < t # 10 mm : 0,2 t;
Ð for t > 10 mm : 0,1 t, max. 4 mm.
Ð maximum internal misalignment
permitted:
Ð for t # 5 mm : 0,5 t, max. 1 mm;
Ð for t > 5 mm : 0,05(t-5) + 1, max. 2 mm.
BSI 08-1999
Page 17
EN 288-9:1999
Annex C (informative)
Welding procedure approval record form
Welding procedure approval Ð Test certificate (WPAR)
Manufacturer's welding procedure
Reference no.:
Manufacturer:
Address:
Code/testing standard:
Date of welding:
Examiner or examining body:
Reference no.:
Extent of approval
Welding process:
Joint type:
Parent metal(s)
Supply conditions:
Metal thickness (mm):
Outside diameter (mm):
Filler metal type:
Shielding gas/flux:
Type of welding current:
Welding positions:
Preheat:
Post-weld heat treatment and/or ageing:
Other information:
Ð Time lapse between start of root pass and start of hot pass:
Certified that test welds prepared, welded and tested satisfactorily in accordance with the requirements of the
code/testing standard indicated above.
Location
Date of issue
Examiner or examining body
Name, date and signature
BSI 08-1999
Page 18
EN 288-9:1999
Test results
Manufacturer's welding procedure
Reference no.:
Visual examination:
Magnetic particle examination*:
Examiner or examining body:
Reference no.:
Radiographic examination*:
Ultrasonic examination*:
Temperature:
Tensile tests
Type/no.
Re
N/mm2
Rm
N/mm2
A % on
Z%
Fracture location
Remarks
Requirement
Macro examination:
Impact test*
Notch
location/direction
Type:
Temperature
8C
Size:
Values
1
2
3
Requirement:
Average
Remarks
Hardness tests*
Location of measurements (Sketch*)
Type/load
Parent metal:
HAZ:
Weld metal:
Other tests:
Remarks:
Tests carried out in accordance with the requirements of:
Laboratory report reference no.:
Test results were acceptable/not acceptable
(Delete as appropriate)
Test carried out in the presence of:
Name date and signature
Examiner or examining body
*
If required.
BSI 08-1999
Page 19
EN 288-9:1999
Detail of weld test
Location:
Manufacturer's welding procedure
Reference no.:
WPAR no.:
Manufacturer:
Welder's name:
Welding process:
Joint type:
Weld preparation details (Sketch)*:
Examiner or examining body
Method of preparation and cleaning;
Parent material specification:
Material thickness (mm):
Outside diameter (mm):
Welding position:
Joint design
Welding sequences
Welding details
Run
Process
Size of
filler
metal
Current A Voltage V
Type of
current/
polarity
Wire feed
Run out length/
travel speed*
Filler metal designation and trade name:
Any special backing or drying:
Gas/flux:
shielding:
backing:
Gas flow rate Ð
shielding:
backing:
Tungsten electrode type/size:
Details of back gouging/backing:
Preheat temperature:
Interpass temperature:
Post-weld heat treatment and/or ageing:
Time, temperature, method:
Heating and cooling rates*:
Other information*:
e.g.: weaving (maximum width of run):
Oscillation: amplitude, frequency, dwell time:
Pulse welding details:
Stand off distance:
Torch angle:
Manufacturer
Examiner or examining body
Name, date and signature
*
If required.
BSI 08-1999
Name, date and signature
Heat
input*
BS EN
288-9:1999
BSI
389 Chiswick High Road
London
W4 4AL
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BSI Ð British Standards Institution
BSI is the independent national body responsible for preparing British Standards. It
presents the UK view on standards in Europe and at the international level. It is
incorporated by Royal Charter.
Revisions
British Standards are updated by amendment or revision. Users of British Standards
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British Standard would inform the Secretary of the technical committee responsible,
the identity of which can be found on the inside front cover. Tel: 020 8996 9000.
Fax: 020 8996 7400.
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Tel: 020 8996 7070.
Specification and
approval of welding
procedures for metallic
materials Ð
Part 9: Welding procedure test for
pipeline welding on land and offshore
site butt welding of transmission
pipelines
The European Standard EN 288-9:1999 has the status of a
British Standard
ICS 25.160.10
NO COPYING WITHOUT BSI PERMISSION EXCEPT AS PERMITTED BY COPYRIGHT LAW
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BS EN
288-9:1999
BS EN 288-9:1999
National foreword
This British Standard is the English language version of EN 288-9:1999.
The UK participation in its preparation was entrusted by Technical Committee
WEE/21, Pipework welding, to Subcommittee WEE/21/7, Field welding, which has
the responsibility to:
Ð aid enquirers to understand the text;
Ð present to the responsible European committee any enquiries on the
interpretation, or proposals for change, and keep the UK interests informed;
Ð monitor related international and European developments and promulgate
them in the UK.
A list of organizations represented on this subcommittee can be obtained on request
to its secretary.
Cross-references
The British Standards which implement international or European publications
referred to in this document may be found in the BSI Standards Catalogue under the
section entitled ªInternational Standards Correspondence Indexº, or by using the
ªFindº facility of the BSI Standards Electronic Catalogue.
A British Standard does not purport to include all the necessary provisions of a
contract. Users of British Standards are responsible for their correct application.
Compliance with a British Standard does not of itself confer immunity
from legal obligations.
Summary of pages
This document comprises a front cover, an inside front cover, the EN title page,
pages 2 to 19 and a back cover.
The BSI copyright notice displayed throughout this document indicates when the
document was last issued.
This British Standard, having
been prepared under the
direction of the Engineering
Sector Committee, was published
under the authority of the
Standards Committee and comes
into effect on 15 August 1999
BSI 08-1999
ISBN 0 580 32580 6
Amendments issued since publication
Amd. No.
Date
Comments
EN 288-9
EUROPEAN STANDARD
NORME EUROPEÂENNE
EUROPAÈISCHE NORM
March 1999
ICS 25.160.10
English version
Specification and approval of welding procedures for metallic
materials Ð Part 9: Welding procedure test for pipeline welding on
land and offshore site butt welding of transmission pipelines
Descriptif et qualification d'un mode opeÂratoire de
soudage pour les mateÂriaux meÂtalliques Ð
Partie 9: Epreuve de qualification d'un mode
opeÂratoire de soudage pour le soudage bout a bout
de canalisations de transport sur site, sur terre et
en mer
Anforderung und Anerkennung von
Schweiûverfahren fuÈr metallische Werkstoffe Ð
Teil 9: SchweiûverfahrenspruÈfung fuÈr
baustellengeschweiûte StumpfnaÈhte von
Versorgungsrohrleitungen an Land und Offshore
This European Standard was approved by CEN on 3 March 1999.
CEN members are bound to comply with the CEN/CENELEC Internal Regulations
which stipulate the conditions for giving this European Standard the status of a
national standard without any alteration. Up-to-date lists and bibliographical
references concerning such national standards may be obtained on application to
the Central Secretariat or to any CEN member.
This European Standard exists in three official versions (English, French, German).
A version in any other language made by translation under the responsibility of a
CEN member into its own language and notified to the Central Secretariat has the
same status as the official versions.
CEN members are the national standards bodies of Austria, Belgium, Czech
Republic, Denmark, Finland, France, Germany, Greece, Iceland, Ireland, Italy,
Luxembourg, Netherlands, Norway, Portugal, Spain, Sweden, Switzerland and
United Kingdom.
CEN
European Committee for Standardization
Comite EuropeÂen de Normalisation
EuropaÈisches Komitee fuÈr Normung
Central Secretariat: rue de Stassart 36, B-1050 Brussels
1999 CEN All rights of exploitation in any form and by any means reserved worldwide for CEN national
Members.
Ref. No. EN 288-9:1999 E
Page 2
EN 288-9:1999
Foreword
This European Standard has been prepared by
Technical Committee CEN/TC 121, Welding, the
Secretariat of which is held by DS.
This European Standard shall be given the status of a
national standard, either by publication of an identical
text or by endorsement, at the latest by
September 1999, and conflicting national standards
shall be withdrawn at the latest by September 1999.
According to the CEN/CENELEC Internal Regulations,
the national standards organizations of the following
countries are bound to implement this European
Standard: Austria, Belgium, Czech Republic, Denmark,
Finland, France, Germany, Greece, Iceland, Ireland,
Italy, Luxembourg, Netherlands, Norway, Portugal,
Spain, Sweden, Switzerland and the United Kingdom.
Contents
Foreword
Introduction
1
Scope
2
Normative references
3
Definitions
3.1 repair
3.2 full penetration repair
3.3 internal repair
3.4 make
4
Preliminary welding procedure
specification (pWPS)
5
Welding procedure test
6
Test piece
6.1 General
6.2 Shape and dimensions of test pieces
6.3 Welding of test pieces
7
Examination and testing
7.1 Extent of testing
7.2 Location and cutting of test specimens
7.3 Non-destructive examination
7.4 Destructive tests
7.5 Re-testing
8
Range of approval
8.1 General
8.2 Related to the manufacturer
8.3 Related to the material
8.4 Common to all welding procedures
8.5 Specific to processes
8.6 Period of validity
9
Wedling procedure approval record
(WPAR)
Annex A (normative) Repairs
Annex B (informative) A-deviations
Annex C (informative) Welding procedure
approval record form
Page
2
3
3
3
4
4
4
4
4
4
4
4
4
4
4
4
4
4
6
6
11
12
12
12
12
13
14
14
14
15
16
17
BSI 08-1999
Page 3
EN 288-9:1999
Introduction
2 Normative references
All new welding procedure approvals are in
accordance with this standard from the date of its
issue.
However, this standard does not invalidate previous
welding procedure approvals made to former national
standards or specification, providing the intent of the
technical requirements is satisfied and the previous
procedure approvals are relevant to the application
and production work on which they are employed.
Also, where additional tests are carried out to make
the welding procedure approval technically equivalent,
the additional tests are made on a test piece which
should be made in accordance with this standard.
Consideration of previous procedure approvals to
former national standards or specifications should be
made at the time of the enquiry or contract stage and
agreed between the contracting parties.
This European Standard incorporates by dated or
undated reference, provisions from other publications.
These normative references are cited at the
appropriate places in the text and the publications are
listed hereafter. For dated references, subsequent
amendments to or revisions of any of these
publications apply to this European Standard only
when incorporated in it by amendment or revision. For
undated references the latest edition of the publication
referred to applies.
EN 288-1, Specification and approval of welding
procedures for metallic materials Ð Part 1: General
rules for fusion welding.
EN 288-2, Specification and approval of welding
procedures for metallic materials Ð Part 2: Welding
procedure specification for arc welding.
EN 439, Welding consumables Ð Shielding gases for
arc welding and cutting.
EN 760, Welding consumables Ð Fluxes for submerged
arc welding Ð Classification.
EN 875, Destructive tests on welds in metallic
materials Ð Impact tests Ð Test specimen location,
notch orientation and examination.
EN 895, Destructive tests on welds in metallic
material Ð Tranverse tensile test.
EN 970, Non-destructive examination of welds Ð
Visual examination.
EN 1043-1, Destructive test on weld in metallic
materials Ð Hardness testing Ð Part 1: Hardness
test on arc welded joints.
EN 1290, Non-destructive examination of welds Ð
Magnetic particle examination of welds.
EN 1321, Destructive test on welds in metallic
materials Ð Macroscopic and microscopic
examination of welds.
EN 1435, Non-destructive examination of welds Ð
Radiographic examination of welded joints.
EN 1714, Non-destructive examination of welds Ð
Ultrasonic examination of welded joints.
EN ISO 6947, Welds Ð Working positions Ð
Definitions of angles of slope and rotation.
(ISO 6947:1993)
EN 10045-1, Metallic materials Ð Charpy impact
test Ð Part 1: Test method.
EN 24063, Welding, brazing, soldering and braze
welding of metals Ð Nomenclature of processes
and reference numbers for symbolic representation
on drawings.
(ISO 4063:1990)
EN ISO 6520-1:1998, Welding and applied processes Ð
Classification of geometric imperfections in metallic
materials Ð Part 1: Fusion welding.
(ISO 6520-1:1998)
CR 12187, Welding Ð Guidelines for a grouping
system of materials for welding purposes.
1 Scope
This standard specifies how a welding procedure
specification is approved by welding procedure tests
for on land and offshore site butt welding of
transmission pipelines under normal atmospheric
conditions.
Tests are carried out in accordance with this standard
unless additional tests (e.g. CTOD tests and all weld
metal tensile tests) are specified by the relevant
application standard or contract when these apply.
This standard defines the conditions for the execution
of welding procedure approval tests and the limits of
validity of an approved welding procedure for all
practical welding operations within the range of
variables listed in clause 8.
It applies to the arc welding of steels of groups 1, 2
and 3 according to CR 12187. The principles of this
standard can be applied to other fusion welding
processes subject to agreement between the
contracting parties.
The requirements for welding procedure specification
and qualification for hyperbaric and ªwetº welding are
not covered by this supplementary standard.
Arc welding is covered by the following processes in
accordance with EN 24063:
111 Ð metal-arc welding with covered electrode;
114 Ð flux-cored wire metal-arc welding without
gas shield;
121 Ð submerged arc welding with wire
electrode;
131 Ð metal-arc inert gas welding, MIG-welding;
135 Ð metal-arc active gas welding, MAG-welding;
136 Ð flux-cored wire metal-arc welding with
active gas shield;
141 Ð tungsten inert gas arc welding,
TIG-welding.
Other fusion welding processes by agreement e.g.
metal cored wire arc welding.
BSI 08-1999
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EN 288-9:1999
3 Definitions
For the purposes of this standard, the definitions listed
below and in EN 288-1 apply.
3.1
repair
any operation which involves welding to rectify the
weld, outside the normal welding cycle
3.2
full penetration repair
welded repair through the whole thickness of the
qualification joint
3.3
internal repair
welded repair carried out from the inside surface or
the root side of a weld, after excavation and
repreparation, using either a single or a multi-pass
weld deposition sequence
3.4
make
specific trade or brand name of the consumable, but
not its designation
4 Preliminary welding procedure
specification (pWPS)
The preliminary welding procedure specification shall
be prepared in accordance with EN 288-2. It shall
specify the range for all relevant parameters including
the following additional items:
Ð steel grade and supply conditions
(N, TM, QT steels);
Ð number and location of welders;
Ð time lapse between start of root pass and start of
hot pass;
Ð partially completed joint: number of runs before
the joint is permitted to cool to ambient
temperature;
Ð type of line up clamp;
Ð time of clamp removal;
Ð number of runs completed before lowering off or
barge move up;
Ð preheating method;
Ð method to control cooling.
5 Welding procedure test
The making and testing of test pieces representing the
type of welding used in production shall be carried out
in accordance with clauses 6 and 7 of this standard.
When a welding procedure is to be qualified and
approved for pipe-reeling, the proposed welding
procedures shall include relevant previously
documented strain ageing data and/or any additional
tests specified.
NOTE These tests can include representative strain cycles and
accelerated ageing typically for 1 h at 1008 C.
Where data regarding pipe material performance/weldability
exist, these data shall be considered when selecting
suitable welding parameters and conditions for
incorporating into the pWPS. Where such data do not
exist it can be necessary to carry out preliminary
welding trials to establish these data.
The welder who undertakes the welding procedure test
satisfactorily in accordance with this standard can be
approved, by agreement between the contracting
parties, for welding on site within the ranges covered
by the approved welding procedure specification.
6 Test piece
6.1 General
The welded assembly to which the welding procedure
will relate in production shall be represented by
making a standardized test piece or pieces, as specified
in 6.2.
6.2 Shape and dimensions of test pieces
Test welds shall be made between whole pipe lengths
(if agreed between the contracting parties the length
could be reduced to a minimum of one diameter)
under simulated site conditions (this may include the
application of installation strains). Welding shall follow
the pWPS, with removal of line-up clamps, lowering
off, partial completion and recommencement where
applicable.
6.3 Welding of test pieces
Preparation and welding of test pieces shall be carried
out in accordance with the pWPS, and under the
general conditions of production welding which they
shall represent. Welding positions and limitations for
the angle of slope and rotation of test piece shall be in
accordance with EN ISO 6947 (see also 8.4.2).
If tack welds are to be fused into the final joint they
shall be included in the test piece.
Welding and testing of the test pieces shall be
witnessed by an examiner or examining body.
7 Examination and testing
7.1 Extent of testing
The testing includes both non-destructive examination
(NDE) and destructive testing which shall be carried
out in accordance with the requirements of Table 1.
When Charpy impact tests are specified for welds
exceeding 20 mm thick, they are required at two
different thickness locations (see 7.4.3).
Repairs outside essential variables need full approval
in accordance with annex A.
7.2 Location and cutting of test specimens
The location of test specimens shall be in accordance
with Figures 1 and 2.
Test specimens shall be taken after non-destructive
examination (NDE) has shown satisfactory results. It is
permitted to take the test specimens from locations
avoiding areas showing acceptable imperfections.
BSI 08-1999
Page 5
EN 288-9:1999
Table 1 Ð Examination and testing of the test pieces
Test piece
Butt-weld
Type of test
Visual examination (EN 970)
Radiographic examination (EN 1435) or
Ultrasonic examination (EN 1714)
Surface crack detection
Transverse tensile test (EN 895)
Impact test (EN 875)
Hardness test (EN 1043-1)
Macro-examination (EN 1321)
Extent of testing
Note
100%
Ð
100 %
100 %
2 test specimens
2 or 4 sets
required
1 test specimen
Ð
1
Ð
2
3
Ð
NOTE 1 Magnetic particle examination according to EN 1290.
NOTE 2 1 set in the weld metal and 1 set in the HAZ at each location. See also 7.4.3.
NOTE 3 Not required for parent metals in ferritic steels with Rm # 430 N/mm2 (Re # 275 N/mm2).
Figure 1 Ð Location of test specimens for a butt-weld in pipe Ð Upwards welding
BSI 08-1999
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EN 288-9:1999
Figure 2 Ð Location of test specimens for a butt-weld in pipe Ð Downwards welding
7.3 Non-destructive examination
7.3.1 Method
After any required post-weld heat treatment and prior
to the cutting of test specimens, all test pieces shall be
examined visually and non-destructively in accordance
with 7.1.
For non-post-weld heat treated test pieces, account
should be taken of the materials susceptibility to
hydrogen induced cracking and consequently the NDE
should be delayed. The NDE delay shall be 24 h, unless
agreed by the contracting parties or by the relevant
application standard.
7.3.2 Acceptance levels
A welding procedure is approved if the imperfections
in the test piece are within the specified limits given in
Table 2.
7.4 Destructive tests
For welds carried out by cellulosic coated electrodes, a
degassing heat treatment of 250 8C of up to 16 h can be
carried out, if necessary according to special
requirements.
7.4.1 Transverse tensile testing
Tests specimens and testing for transverse tensile
testing for butt joints shall be in accordance
with EN 895.
For pipes > 50 mm outside diameter, the weld
reinforcement shall be removed on both faces to give
the test specimen a thickness equal to wall thickness
of the pipe.
Transverse tensile test is acceptable if the test
specimen breaks in the parent material or when it
breaks in the weld metal with a tensile strength equal
to or greater than the specified minimum tensile
strength of pipe material.
7.4.2 Macro-examination
Test specimens and testing for macro examination shall
be in accordance with EN 1321.
The acceptance levels stated in 7.3.2 shall apply.
7.4.3 Impact testing
In the absence of an application standard, impact
testing is required for pipes with specified impact
properties and wall thicknesses t $ 12 mm.
Test specimens shall be taken and prepared in
accordance with EN 10045-1 in such a way that the
axis of the notch is perpendicular to the pipe surface.
Test specimens and testing for impact test shall be in
accordance with this standard for position and
temperature of testing, and with EN 875 for dimensions
and testing.
For weld metal, test specimen type VWT0 and for HAZ
specimen type VHT0 shall be used (see Figure 3).
From each specified position, each set shall be
comprised of three test specimens.
Test specimens with Charpy V-notch shall be used and
sampled from 1 mm to 2 mm below the inner surface
of the pipe and transverse to the weld.
When the pipe wall thickness exceeds 20 mm, two
more sets are required, in the same circumferential
locations, but taken within 1 mm to 2 mm of the
outside surface of the pipe.
Test temperature and absorbed energy shall be in
accordance with the specified design requirements for
the complete product, provided the requirements laid
down by the application standard are met.
BSI 08-1999
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EN 288-9:1999
Table 2 Ð Limits for imperfections
Imperfection designation
Cracks
EN ISO 6520-1:
1998 reference
100
Limits for imperfections
Not permitted
Gas pore
Uniformly distributed porosity
Linear porosity
Elongated cavity
Surface pore
2011
2012
2014
2016
2017
Individual gas pores or uniformly distributed
porosity shall be unacceptable when any of
the following conditions exists:
a) the size of an individal pore
exceeds 3 mm;
b) the size of an individal pore exceeds 25 %
of the thinner of the nominal wall thickness
joined;
c) the total area, when projected radially
through the weld shall not exceed 2 % of the
projected weld area in the radiograph,
consisting of the length of the weld affected
by the porosity, with a minimum length
of 150 mm multiplied by the maximum width
of the weld.
Localized (clustered) porosity
2013
Ð Clustered porosity that occurs in any
pass except the finish pass shall comply
with the criteria of gas pores.
Ð Clustered porosity that occurs in the
finish pass shall be unacceptable when any
of the following conditions exists:
a) the diameter of the clustered porosity
exceeds 13 mm;
b) the aggregate length of clustered
porosity in any continuous 300 mm length
of weld exceeds 13 mm;
c) an individual pore within a clustered
porosity exceeds 2 mm in size.
Elongated cavity
2015
Unacceptable in the root pass when any of the
following conditions exists:
a) the length of an individual indication
exceeds 50 mm;
b) the aggregate length of the elongated
cavities in any continuous 300 mm length of
weld exceeds 50 mm;
c) the aggregate length of the elongated
cavities exceeds 15 % of the weld length.
Crater pipe
2024
Unacceptable when the maximum length
exceeds 2 mm or 30 % of the wall thickness,
whichever is the smaller.
BSI 08-1999
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EN 288-9:1999
Table 2 Ð Limits for imperfections (continued)
Imperfection designation
Slag inclusion:
Ð linear
Ð isolated
EN ISO 6520-1:
1998 reference
301
3011
3012
Limits for imperfections
Unacceptable when any of the following
conditions exists:
a) the length of a linear slag inclusion
exceeds 50 mm;
NOTE Parallel linear indications separated by
approximately the width of the root run (wagon
tracks) should be considered as single indications
unless the width of either of them exceeds 0,8 mm. In
that case, they should be considered as separate
indications.
Metallic inclusions:
Ð tungsten
Ð copper
304
3041
3042
Lack of fusion:
Ð lack of side wall fusion
Ð lack of inter-run fusion
401
4011
4012
b) the aggregate length of linear slag
inclusions in any continuous 300 mm length
of weld exceeds 50 mm;
c) the width of a linear slag inclusion
exceeds 1,6 mm;
d) the aggregate length of isolated slag
inclusions in any continuous 300 mm length
of weld exceeds 50 mm;
e) the width of an isolated slag inclusion
exceeds 3 mm or 50 % of the wall thickness,
whichever is less;
f) more than four isolated slag inclusions
with the maximum width of 3 mm are
present in any continuous 300 mm length of
weld;
g) the aggregate length of linear and isolated
slag inclusions exceeds 15 % of the weld
length.
Unacceptable when any of the following
conditions exists:
a) the size of a copper or tungsten inclusion
exceeds 3 mm or 50 % of the wall thickness,
whichever is the smaller;
b) the aggregate length of copper or
tungsten inclusions exceeds 12 mm in any
continuous 300 mm length of weld or more
than four such inclusions are present in any
continuous 300 mm length of weld.
Unacceptable when any of the following
conditions exists:
a) the length of an individual indication
exceeds 50 mm
b) the aggregate length of indications in any
continuous 300 mm length of weld exceeds
50 mm;
c) the aggregate length of indications
exceeds 15 % of the weld length.
BSI 08-1999
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EN 288-9:1999
Table 2 Ð Limits for imperfections (continued)
Imperfection designation
EN ISO 6520-1:
1998 reference
Ð lack of fusion at the root of the weld
4013
Lack of penetration (incomplete penetration)
402
Undercut
Undercut
Shrinkage groove
Excess weld metal
Excessive penetration
BSI 08-1999
5011
5012
5013
502
504
Limits for imperfections
Unacceptable, for single sided welds, when
any of the following conditions exists:
a) the length of an individual indication
exceeds 25 mm;
b) the aggregate length of indications in any
continuous 300 mm length of weld exceeds
25 mm;
c) the aggregate length of indications
exceeds 8 % of the weld length in any weld
less than 300 mm long.
Unacceptable when any of the following
conditions exists:
a) the length of an individual indication of
incomplete penetration exceeds 25 mm;
b) the aggregate length of indications of
incomplete penetration in any continuous
300 mm length of weld exceeds 25 mm;
c) the aggregate length of indications of
incomplete penetration exceeds 8 % of the
weld length in any weld less than 300 mm
long;
d) incomplete penetration in double sided
welds exceeds 50 mm in total length in any
continuous 300 mm of weld length or 15 %
of the weld length.
Unacceptable when any of the following
conditions exists:
a) the aggregate length of undercut, both
external and internal, in any continuous
300 mm length of weld exceeds 50 mm;
b) the aggregate length of undercut, both
external and internal, exceeds 15 % of the
weld length.
Undercuts shall not be deeper than 1,5 mm or
10 % of the pipe wall thickness, whichever is
the smaller.
Both external and internal reinforcement
should not exceed a height of more than
3 mm.
Page 10
EN 288-9:1999
Table 2 Ð Limits for imperfections (continued)
Imperfection designation
Linear misalignment
EN ISO 6520-1:
1998 reference
507
Limits for imperfections
Ð Maximum external misalignment permitted:
Ð for t # 10 mm
: 0,3 t;
Ð for 10 mm < t # 20 mm : 3 mm;
Ð for t > 20 mm
: 0,125 t.
Ð Maximum internal misalignment permitted:
Ð 1 mm on entire circumference;
Ð 2 mm over length D;
Ð 2,5 mm over length 1/3 D.
Sagging in flat (PA) or overhead (PE)
Burn through
5092
510
Unacceptable.
Unacceptable when any of the following
conditions exists:
a) the maximum dimension exceeds 6 mm
and the density of the burn through of the
radiographic image exceeds that of the
thinnest adjacent parent metal;
b) the maximum dimension exceeds the
thinner of the nominal wall thicknesses
joined, and the density of the burn through
of the radiographic image exceeds that of
the thinnest adjacent parent metal;
c) more than one burn through of any size
is present and the density more than one of
the radiographic images exceeds that of the
thinnest adjacent parent metal.
Unacceptable.
Incompletely filled grove
511
Root concavity
515
Root concavity up to 25 % of the total length
of weld, is acceptable, provided the density of
the radiographic image of the root concavity
does not exceed that of the thinnest adjacent
parent metal. For areas that exceed the density
of the thinnest adjacent parent metal, the
criteria for burn through (510) are applicable.
Accumulation of imperfections
Ð
Any accumulation of imperfections shall be
unacceptable when any of the following
conditions exists:
a) the aggregate length of indications in any
continuous 300 mm length of weld exceeds
50 mm;
b) the aggregate length of indications
exceeds 15 % of the weld length.
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EN 288-9:1999
Dimensions in millimetres
Figure 3a Ð For all wall thicknesses
Figure 3b Ð Additional for wall thicknesses > 20 mm
Figure 3 Ð Position of Charpy-V notch test specimens
7.4.4 Hardness testing
The hardness testing shall be in accordance
with EN 1043-1. The Vickers method HV10 shall be
used. The indentation shall be made in the weld, the
HAZs and the parent metal with the object of
measuring and recording the range of values in the
weld joint. This will include rows of indentation one of
which shall be 2 mm maximum below each surface.
For each row of indentation there shall be a minimum
of three individual indentations in each part of the
weld, the HAZ (both sides) and the parent metal (both
sides).
For the HAZ the first indentation shall be placed as
close to the fusion line as possible.
The results from the hardness test shall meet the
requirements given in Table 3.
7.5 Re-testing
If the test piece fails to comply with any of the
requirements for visual examination or NDE specified
in 7.3.2, one further test piece shall be welded and
subjected to the same examination. If this additional
test piece does not comply with the relevant
requirements, the pWPS shall be regarded as not
capable of complying with the requirements of this
standard without modification.
If any test specimen fails to comply with the relevant
requirements of 7.4 only due to geometric weld
imperfections, two further test specimens shall be
obtained for each one that failed. These can be taken
from the same test piece if there is sufficient material
available or from a new test piece, and shall be
subjected to the same test.
If either of these additional test specimens does not
comply with the relevant requirements, the pWPS shall
be regarded as not capable of complying with the
requirements of this standard without modification.
Table 3 Ð Permitted maximum hardness values HV10
Hardness location
Weld metal
Root
Heat-affected zone
Cap
Root
Cap
Sour service, any process:
t < 9,5 mm;
t $ 9,5 mm.
250
250
275
275
250
250
275
300
Non-sour service:
Ð manual welding with cellulosic electrodes;
Ð other welding processes.
275
275
275
275
275
350
325
350
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EN 288-9:1999
8 Range of approval
8.1 General
All the conditions of validity stated below shall be met
independently of each other.
Changes outside of the ranges specified shall require a
new welding procedure test.
8.2 Related to the manufacturer
An approval of a WPS obtained by a manufacturer is
valid in workshops or sites under the same technical
and quality control of that manufacturer.
8.3 Related to the material
8.3.1 Parent metal
A welding procedure test carried out with one of the
steel grades of a group covers for steel grades with
lower or equal specified minimum yield strength of
that group but does not cover steel grades with higher
specified minimum yield strength.
A change of supply conditions requires a reapproval of
the welding procedure test in all cases.
In addition a reapproval of the welding procedure test
is required, if the ladle analysis differs from that tested
by more than the amount defined in Table 4:
Ð for group 1.1 steels when CTOD test is required;
Ð for groups 1.2 and 1.3 steels when either impact
test or CTOD test is required;
Ð for groups 2 and 3 steels.
8.3.1.1 Grouping system
Steel grades are grouped in accordance with CR 12187
(groups 1, 2 and 3).
Table 4 Ð Qualified ranges of chemical analysis
Element
Part 1
Part 24)
Part 35)
Value tested
Values qualified
Value tested ±0,04 %
Value tested ±0,25 %
Value tested ±0,20 %
Up to 0,015 % over the value tested
Not less than 0,009 %, up to 0,015 %
over the value tested
Up to 0,015 % over value tested
Value tested 20,06 % or +0,03 %2)3)
Carbon
Manganese
Silicon
Sulfur
Any
Any
Any
Not over 0,008 %
Over 9,008 %
Phosphorus
Carbon equivalent1)
Any
Any
Aluminium(tot)
Not over 0,015 %
Over 0,015 %
Niobium
Vanadium
Nickel
Copper
Chromium
Molybdenum
Titanium
Any
Any
Any
Any
Any
Any
Any
Not less than value tested
Value tested ±0,030 % but shall be
between 0,016 % and 0,060 %
Value tested 20,02 % or +0,01 %
Value tested ±0,03 %
Value tested ±0,10 %
Value tested 20,20 % or +0,10 %
Value tested 20,10 % or +0,05 %
Value tested 20,10 % or +0,05 %
Value tested ±0,005 %
Nitrogen
Calcium
Any
Not over 0,004 %
Over 0,004 %
Value tested +0,004 %
Not over 0,004 %
Not over value tested
1)
Carbon equivalent = % C + % Mn/6 + (% Cr + % Mo + % V)/5 + (% Ni + % Cu)/15.
2)
The client may specify a lower maximum for sour service.
3)
For steels of carbon equivalent $ 0,4 % increase preheat can be needed
4)
The ªvalues qualifiedº limits in this part apply only where impact testing is required, or where the material tested has a carbon
equivalent exceeding 0,43 %
5) Measurement of elements of this part is not required unless CTOD testing is required and the material tested has a carbon
equivalent exceeding 0,40 %.
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EN 288-9:1999
8.3.2 Parent metal thickness and pipe diameter
8.3.2.1 Thickness
The approval of a welding procedure test on
thickness t shall include approval for thicknesses in the
following ranges given in Table 5, provided this does
not conflict with the impact test requirements
of 7.4.3.
8.3.2.2 Pipe diameter
The approval of a welding procedure test on outside
diameter D shall include approval for diameters in the
range 0,5 D to 2 D.
8.4 Common to all welding procedures
8.4.1 Welding process
The approval is valid only for the welding process used
in the welding procedure test. In a multi-process
procedure the approval is only valid for the order used
in the welding procedure test.
8.4.2 Welding positions
The range of approval for welding position is ±258 of
the position tested, except for position PA according to
EN ISO 6947 which is qualified by position PF or PG.
8.4.3 Type of joint
Any change in joint configuration outside tolerances
specified in the WPS requires a reapproval of the
welding procedure test.
8.4.4 Filler metal designation
Where the filler metal designation is based on tensile
or yield strengths the approval of one filler metal shall
approve the others within the same specified group
except where impact properties are required to be
demonstrated.
Where the filler metal designation is based on chemical
composition the approval of one filler metal shall
approve others within the same specified chemical
group.
A change of type of coating or flux e.g. basic/rutile/cellulosic
shall entail reapproval of the welding procedure.
8.4.5 Filler metal make
When impact testing is required, the approval given is
only applicable to the specific make used in the
welding procedure test. It is permissible to change the
specific make of filler metal to another with the same
compulsory part of the classification when an
additional test piece is welded.
This test piece shall be welded using the identical
welding parameters as the original weld procedure test
and only weld metal impact test specimens shall be
tested.
NOTE This provision does not apply to solid wire and rods with
the same classification and nominal chemical compositions.
8.4.6 Type of current
The approval given is the type of current (a.c., d.c.,
pulsed current) and the polarity used in the welding
procedure test.
8.4.7 Heat input
The requirements of this clause only apply when the
control of heat input is specified.
When impact requirements apply, the upper limit of
heat input approved is 15 % greater than that used in
the welding procedure test.
The lower limit of heat input approved is 15 % lower
than that used in the welding procedure test.
8.4.8 Preheat temperature
The lower limit of approval is the preheat temperature
used in the welding procedure test.
8.4.9 Interpass temperature
The upper limit of approval is the interpass
temperature used in the welding procedure test and
shall not exceed 250 8C.
8.4.10 Post-heating
When post-heating is carried out as a part of the WPS,
the time and the temperature of the post-heating shall
be not less than those reached in the welding
procedure test.
8.4.11 Post-weld heat-treatment
Addition or deletion of post-weld heat-treatment is not
permitted.
The temperature range approved is the holding
temperature used in the welding procedure test ±20 8C
unless otherwise specified. Where required, heating
rates, cooling rates and holding time shall be related to
the production assembly.
8.4.12 Removal of line up clamp
The line up clamp shall not be removed when the
length of weld (in % of circumference) or number of
runs is less than that reached in the welding procedure
test.
Table 5 Ð Range of approval for thickness
Dimensions in millimetres
Thickness of the test piece t
3 < t # 12
12 < t # 100
BSI 08-1999
Range of approval
Steel
Steel
Steel
Re # 275 N/mm2
275 < Re # 360 N/mm2
Re = 360 N/mm2
3 to 2 t
0,8 t to 1,5 t
0,8 t to 1,25 t
0,5 t to 2 t (max. 150)
0,8 t to 1,5 t
0,8 t to 1,25 t
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EN 288-9:1999
8.4.13 Time interval
The requirements of this clause shall only apply when
cellulosic electrodes are used.
The approval given is restricted to time lapses not
exceeding that recorded in the welding procedure test.
8.4.14 Number of welders
The approval given is restricted to the minimum
number of root run and hot pass welders used in the
welding procedure test.
The number of welders used for filling passes can be
different but shall at least be equal to that recorded in
the welding procedure test.
8.4.15 Partially completed joint
The approval given is restricted to welds which have at
least as many runs deposited before cooling below
preheat temperature as recorded in the welding
procedure test.
8.5 Specific to processes
8.5.1 Processes 111 and 114
The approval given is for the diameter of electrode
used in the welding procedure test plus or minus one
electrode diameter size for each run, with the
exception of the two first layer and the capping layer
on single sided without backing butt-welds for which
no size change is permissible.
8.5.2 Process 121
The approval given is restricted to the wire system and
wire diameters used in the welding procedure test
(e.g. single-wire or multiple-wire system).
The approval given for the flux is restricted to the
make and classification according to EN 760 used for
the procedure welding test.
8.5.3 Processes 131, 135 and 136
The approval given to the face and/or back shielding
gas is restricted to the type of gas (nominal
composition) according to EN 439 used in the welding
procedure test.
The approval given is restricted to the wire system
used in the welding procedure test (e.g. single-wire or
multiple-wire system).
8.5.4 Process 141
The approval given to the face and/or back shielding
gas is restricted to the type of gas (nominal
composition) according to EN 439 used in the welding
procedure test.
A test made without back shielding gas covers welding
back shielding gas.
8.5.5 Face shielding gas flow rate
For processes 131, 135, 136, and 141 the face shielding
gas flow rate shall not change by more than 10 %.
8.6 Period of validity
The period of use of a WPAR is unlimited.
9 Welding procedure approval
record (WPAR)
The welding procedure approval record (WPAR) is a
statement of the results of assessing each test piece
including re-tests. The relevant items listed for the WPS
in EN 288-2 shall be included, together with details of
any features that would be rejectable by the
requirements of clause 7. If no rejectable features or
unacceptable test results are found, a WPAR detailing
the welding procedure test piece results is approved
and shall be signed and dated by the examiner or
examining body.
A WPAR-format shall be used to record details for the
welding procedure and the test results, in order to
facilitate uniform presentation and assessment of the
data.
An example of the WPAR-format is shown in annex C.
BSI 08-1999
Page 15
EN 288-9:1999
Annex A (normative)
Repairs
Before beginning production, the contractor shall
qualify the weld repair procedure applicable to
groups 2 and 3 steels according to CR 12187.
For a joint made in accordance with 6.3, and which
has been or is subsequently shown to be as
satisfactory, in accordance with Table 1, the procedures
shall include two types of repair:
Ð a full penetration repair;
Ð an internal repair if the pipe diameter allows it.
The groove for the repairs shall be made in the axis of
the weld, and located according to Figures A.1 and A.2.
NOTE Rotation of the pipe is permissible to avoid overlap with
the main weld procedure testing.
The testings shall be carried out in accordance
with 7.3 and 7.4.
Figure A.1 Ð Location of type of repairs Ð Upwards welding
Figure A.2 Ð Location of type of repairs Ð Composite welding
(root pass upwards, filling downwards)
BSI 08-1999
Page 16
EN 288-9:1999
Annex B (informative)
A-deviations
A-deviation: National deviation due to regulations, the
alteration of which is for the time being outside the
competence of the CEN/CENELEC member.
This European Standard falls under Directive 97/23.
NOTE (from CEN/CENELEC Internal Regulations Part 2:1994, 3.1.9):
Where standards fall under EU Directives, it is the view of the
Commission of the European Communities (OJ No C 59, 9.3.1982)
that the effect of the decision of the Court of Justice in case
815/79 Cremonini/Vrankovich (European Court Reports 1980, p.
3583) is that compliance with A-deviations is no longer mandatory
and that the free movement of products complying with such a
standard should not be restricted within the EU except under the
safeguard procedure provided for the relevant Directive.
A-deviations in an EFTA country are valid instead of
the relevant provisions of the European Standard in
that country until they have been removed.
Clause A-deviation
SWEDEN
7.3.2
According to Ordinance AFS 1994:39
concerning ªPressure Vesselsº issued by the
National Swedish Board of Occupational
Safety and Health, chapter 4, sections 6, 11
and 12, the clauses which cause the request of
A-deviations are the following:
In Table 2, for linear misalignment (507),
change the limits given by the following ones:
Ð maximum external misalignment
permitted:
Ð for t # 5 mm : 0,5 t, max. 1 mm;
Ð for 5 mm < t # 10 mm : 0,2 t;
Ð for t > 10 mm : 0,1 t, max. 4 mm.
Ð maximum internal misalignment
permitted:
Ð for t # 5 mm : 0,5 t, max. 1 mm;
Ð for t > 5 mm : 0,05(t-5) + 1, max. 2 mm.
BSI 08-1999
Page 17
EN 288-9:1999
Annex C (informative)
Welding procedure approval record form
Welding procedure approval Ð Test certificate (WPAR)
Manufacturer's welding procedure
Reference no.:
Manufacturer:
Address:
Code/testing standard:
Date of welding:
Examiner or examining body:
Reference no.:
Extent of approval
Welding process:
Joint type:
Parent metal(s)
Supply conditions:
Metal thickness (mm):
Outside diameter (mm):
Filler metal type:
Shielding gas/flux:
Type of welding current:
Welding positions:
Preheat:
Post-weld heat treatment and/or ageing:
Other information:
Ð Time lapse between start of root pass and start of hot pass:
Certified that test welds prepared, welded and tested satisfactorily in accordance with the requirements of the
code/testing standard indicated above.
Location
Date of issue
Examiner or examining body
Name, date and signature
BSI 08-1999
Page 18
EN 288-9:1999
Test results
Manufacturer's welding procedure
Reference no.:
Visual examination:
Magnetic particle examination*:
Examiner or examining body:
Reference no.:
Radiographic examination*:
Ultrasonic examination*:
Temperature:
Tensile tests
Type/no.
Re
N/mm2
Rm
N/mm2
A % on
Z%
Fracture location
Remarks
Requirement
Macro examination:
Impact test*
Notch
location/direction
Type:
Temperature
8C
Size:
Values
1
2
3
Requirement:
Average
Remarks
Hardness tests*
Location of measurements (Sketch*)
Type/load
Parent metal:
HAZ:
Weld metal:
Other tests:
Remarks:
Tests carried out in accordance with the requirements of:
Laboratory report reference no.:
Test results were acceptable/not acceptable
(Delete as appropriate)
Test carried out in the presence of:
Name date and signature
Examiner or examining body
*
If required.
BSI 08-1999
Page 19
EN 288-9:1999
Detail of weld test
Location:
Manufacturer's welding procedure
Reference no.:
WPAR no.:
Manufacturer:
Welder's name:
Welding process:
Joint type:
Weld preparation details (Sketch)*:
Examiner or examining body
Method of preparation and cleaning;
Parent material specification:
Material thickness (mm):
Outside diameter (mm):
Welding position:
Joint design
Welding sequences
Welding details
Run
Process
Size of
filler
metal
Current A Voltage V
Type of
current/
polarity
Wire feed
Run out length/
travel speed*
Filler metal designation and trade name:
Any special backing or drying:
Gas/flux:
shielding:
backing:
Gas flow rate Ð
shielding:
backing:
Tungsten electrode type/size:
Details of back gouging/backing:
Preheat temperature:
Interpass temperature:
Post-weld heat treatment and/or ageing:
Time, temperature, method:
Heating and cooling rates*:
Other information*:
e.g.: weaving (maximum width of run):
Oscillation: amplitude, frequency, dwell time:
Pulse welding details:
Stand off distance:
Torch angle:
Manufacturer
Examiner or examining body
Name, date and signature
*
If required.
BSI 08-1999
Name, date and signature
Heat
input*
BS EN
288-9:1999
BSI
389 Chiswick High Road
London
W4 4AL
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