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BS EN 12732:2021

BS EN 12732:2021

$215.11

Gas infrastructure. Welding steel pipework. Functional requirements

Published By Publication Date Number of Pages
BSI 2021 84
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This document contains requirements for the production and testing of weld joints for the installation and modification, including in-service welding, of onshore steel pipelines and pipework used in gas infrastructure. This includes all pressure ranges and processed, non-toxic and non-corrosive natural gas according to EN ISO 13686 and non-conventional gases such as (injected) biomethane and hydrogen, where: – the pipeline elements are made of unalloyed or low-alloyed carbon steel; – the pipeline is not located within commercial or industrial premises as integral part of the industrial process on those premises except for any pipelines and facilities delivering gas to such premises; – the pipework is not located within households or industrial installations according to EN 1775 or EN 15001; – the design temperature of the system is between āˆ’40 Ā°C up to and including 120 Ā°C. For injected biomethane or hydrogen a detailed technical evaluation of the functional requirements is required, ensuring there are no other constituents or properties of the gases that can affect the integrity of the pipeline. This document is not applicable to welds produced prior to the publication of this document. This document specifies common basic principles for gas infrastructure. Users of this document are expected to be aware that there can exist more detailed national standards and/or codes of practice in the CEN member countries. This document is intended to be applied in association with these national standards and/or codes of practice setting out the above-mentioned basic principles. In the event of conflicts in terms of more restrictive requirements in national legislation/regulation with the requirements of this document, the national legislation/regulation takes precedence as illustrated in CEN/TR 13737 (all parts). NOTE CEN/TR 13737 (all parts) contains: – clarification of relevant legislation/regulations applicable in a country; – if appropriate, more restrictive national requirements; – national contact point for the latest information.

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PDF Pages PDF Title
2 undefined
8 1 Scope
2 Normative references
10 3 Terms and definitions
13 4 General requirements
4.1 General
15 4.2 Quality system requirements
17 4.3 Welding contractors
4.4 Welding procedure requirements
4.4.1 General
4.4.2 Welding consumables
18 4.4.3 Impact testing requirements
4.5 Welders
19 4.6 Welding supervisory and coordination personnel
4.7 Non destructive testing (NDT)
4.8 Destructive testing (DT)
5 Production welding
5.1 General
5.2 Working area
5.3 Layout of weld joints
5.4 Types of weld joints
5.4.1 General
20 5.4.2 Weld fit-up
5.4.3 Different wall thickness
5.4.4 Laminations
5.4.5 Interaction of longitudinal or spiral seams at a girth weld
5.5 Joint preparation
5.5.1 Joint end preparation
21 5.5.2 Alignment of the joints
22 5.6 Preheating
5.7 Tacking
5.8 Welding
23 5.9 Actions after welding
5.10 Repair of weld defects
5.11 Destructive testing of production welds for DP over 16 bar
24 6 Attachment-, and in-service welding
6.1 General
6.2 Attachment of structural parts
6.3 Attachment of cathodic protection connections
6.4 Hot-tapping and other welding work on in-service pipelines
25 7 Inspection of the weld joint
7.1 General
7.2 Scope of inspection
27 7.3 Non-destructive testing, assessment levels and acceptance criteria
7.4 Time of inspection
7.5 Tie in welds for DP over 16 bar
7.6 Recording of test results
29 7.7 Requirements for records and documentation
30 8 Metering, regulating and compressor stations
31 Annex A (normative)Qualification of pipeline welders and operators of mechanized welding equipment for steel pipelines
A.1 General
A.2 Additional requirements to EN ISO 96061:2017 and EN ISO 14732:2013
A.2.1 Welded length
A.2.2 Welding conditions
A.2.3 Confirmation of the validity
A.2.4 Revalidation of welder qualification
32 A.2.5 Revocation of Qualification
A.2.6 Welders Qualification Test certificate
A.2.7 Designation
A.3 Additional requirements for operators of mechanized welding equipment
33 Annex B (informative)Testing on lamination defects
34 Annex C (informative)Time-of-flight diffraction technique (TOFD)
C.1 General
C.2 Additional and substitutional requirements to EN ISO 10863:2011
C.2.1 Addition to the whole document EN ISO 10863:2011
C.2.2 Addition to EN ISO 10863:2011, Clause 3 ā€œTerms and definitionsā€
36 C.2.3 Addition to EN ISO 10863:2011, Clause 5, ā€œExamination Levelsā€
C.2.4 Addition to EN ISO 10863:2011, 7.2.2, ā€œUltrasonic probesā€
C.2.5 Substitution of EN ISO 10863:2011, Clause 11, 3rd paragraph ā€œWeld testingā€
37 C.2.6 Substitution of EN ISO 10863:2011, 12.5.2 ā€œSizingā€
43 Annex D (normative)Critical aspects for hot-tap welding or welding on in-service pipelines
D.1 General
D.2 procedural requirements
44 D.3 Supervision
D.4 Safety precautions
D.5 Welding consumables
45 D.6 Welding procedure specification (WPS)
D.7 Welding procedure qualification for in-service welding
D.8 Qualification of the welder
D.9 Weld preparation long seam
D.10 Weld preparation circular seam
46 D.11 Repairs
D.12 Non-destructive testing
D.13 Pressure test
D.14 Documentation
47 Annex E (normative)AUT examination of joints
E.1 Extent of this annex
E.2 General Requirements
E.2.1 General
E.2.2 AUT Quality assurance
48 E.2.3 Content of the procedure
50 E.2.4 Ultrasonic system equipment and components
E.2.4.1 General
E.2.4.2 Recording system
E.2.4.3 Acoustic coupling
E.2.4.4 Set up for scan of repairs
E.2.5 Reference blocks
51 E.2.6 Recorder set-up
E.2.7 Circumferential scanning velocity
E.2.8 Software
E.2.9 Reference line, band position and coating cut-back
52 E.2.10 Operators
E.2.11 Calibration (Sensitivity Setting)
E.2.11.1 Initial static calibration
53 E.2.11.2 Gate settings
E.2.11.3 Recording threshold
54 E.2.11.4 Dynamic calibration
E.2.11.5 Recording of set-up data
E.3 Field Inspection
56 E.4 Adjustments of the AUT system
E.5 Acceptance criteria tier 1
58 E.6 Acceptance criteria tier 2
62 Annex F (informative)Manual ultrasonic testing of weld joints for wall thickness between approximately 6 mm and 8 mm
F.1 General
F.2 Setting of range
F.3 Sensitivity adjustment when using the Distance Gain Size method
66 Annex G (normative)EPRG acceptance criteria
G.1 General
G.2 EPRG defect acceptance levels and defect limits
67 G.3 Requirements
73 Annex H (normative)Visual acceptance criteria according to EN ISO 5817:2014
75 Annex I (normative)RT acceptance criteria according to EN ISO 10675 and EN ISO 5817:2014
77 Annex J (normative)Alternative method and acceptance criteria for UT inspection
J.1 Distance Gain Size method
J.2 Comparative Element method
J.3 General
79 Annex K (informative)Brazing and stud welding of connections for cathodic protection systems
K.1 Joining techniques
K.2 Procedure qualification
80 K.3 Operation qualification
K.4 Production joints
81 Annex L (informative)Significant technical changes between this European Standard and the previous edition

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BS EN 12732:2021
$215.11