oSIST prEN 12732:2020

Gas infrastructure - Welding steel pipework - Functional requirements

This European Standard contains requirements for the production and testing of weld joints for the installation and modification of onshore steel pipelines and pipework used in gas infrastructure, including in-service pipelines, for all pressure ranges for the carriage of processed, non-toxic and non-corrosive natural gas according to EN ISO 13686 and for the carriage of non-conventional gases
such as injected biomethane including 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 household installations according to EN 1775;
- the design temperature of the system is between -40 °C up to and including 120 °C.
The onshore steel pipelines and pipework used in gas infrastructure include in-service pipelines, for all pressure ranges for the carriage of processed, non-toxic and non-corrosive natural gas according to EN ISO 13686 and for the carriage of non-conventional gases complying with EN ISO 13686, and for which a detailed technical evaluation of the functional requirements (such as injected biomethane, hydrogen) is performed ensuring there are no other constituents or properties of the gases that can affect the integrity of the pipeline.
This standard is not applicable to welds produced prior to the publication of this European Standard.
Table 1 assigns the application areas to quality requirement categories as a function of the working pressure and pipe materials used.  
Additional requirements may be specified when, for example:
- the strain on pipelines and systems,
- the materials,
- the line routing,
- the design or the welding technique
are considered critical.

Gasinfrastruktur - Schweißen an Rohrleitungen aus Stahl - Funktionale Anforderungen

Dieses Dokument enthält Anforderungen für die Herstellung und Prüfung von Schweißverbindungen für die Errichtung und Änderungen (einschließlich Schweißen an in Betrieb befindlichen Leitungen) von landverlegten Stahlrohrleitungen und Anlagen, die in der Gasinfrastruktur verwendet werden. Dazu gehören alle Druckbereiche und aufbereitetes, ungiftiges und nicht korrosives Erdgas nach EN ISO 13686 und nichtkonventionelle Gase wie (eingespeistes) Biomethan und Wasserstoff, wo:
-   die Rohrleitungsteile aus nicht legiertem oder niedrig legiertem Kohlenstoffstahl bestehen;
-   alle Leitungen und Anlagen, die sich auf Gewerbe- oder Werksgelände befinden, ausschließlich der Versorgung solcher Grundstücke dienen und kein wesentlicher Bestandteil der Anlagen für Betriebsabläufe auf diesem Gelände sind;
-   es sich nicht um Leitungen innerhalb von Haus- oder Industrieinstallationen handelt, die EN 1775 oder EN 15001 unterliegen;
-   die Auslegungstemperatur zwischen −40 °C bis einschließlich 120 °C liegt.
Für eingespeistes Biomethan oder Wasserstoff ist eine detaillierte technische Bewertung der funktionellen Anforderungen erforderlich, um sicherzustellen, dass es keine anderen Bestandteile oder Eigenschaften der Gase gibt, die die Integrität der Leitung beeinträchtigen können.
Dieses Dokument ist nicht auf Schweißnähte anwendbar, die vor der Veröffentlichung dieses Dokuments erstellt wurden.
Dieses Dokument legt gemeinsame Grundprinzipien für die Gasinfrastruktur fest. Es wird erwartet, dass Anwender dieses Dokuments sich dessen bewusst sind, dass detailliertere nationale Normen bzw. Technische Regeln in den CEN-Mitgliedsländern existieren können.
Dieses Dokument ist für die Anwendung in Verbindung mit diesen nationalen Normen und/oder Verfahrensregeln vorgesehen, welche die vorstehend genannten Grundsätze darlegen.
Beim Auftreten von Widersprüchen aufgrund restriktiver Anforderungen in nationalen Gesetzen/Vorschriften als in diesem Dokument gefordert, haben nationale Gesetze/Vorschriften Vorrang wie in der CEN/TR 13737 (alle Teile) dargestellt.
ANMERKUNG   CEN/TR 13737 (alle Teile) enthält:
-   Klärung relevanter Rechtsvorschriften/Regelungen anwendbar in einem Land;
-   gegebenenfalls restriktivere nationale Anforderungen;
-   nationale Anlaufstelle für die neusten Informationen.

Infrastructures gazières - Soudage des tuyauteries en acier - Prescriptions fonctionnelles

Le présent document contient des prescriptions relatives à l’exécution et au contrôle des assemblages soudés pour l’installation et la modification, y compris les activités de soudage en service, des tuyauteries et canalisations terrestres en acier utilisées dans les infrastructures gazières. Cela inclut toutes les plages de pression pour le transport de gaz naturel non toxique et non corrosif conformément à l’EN ISO 13686, ainsi que les gaz non conventionnels tels que le biométhane et l’hydrogène (injectés) lorsque :
-   les éléments de canalisations sont réalisés en acier au carbone non ou faiblement allié ;
-   la canalisation n’est pas située dans des sites commerciaux ou industriels comme partie intégrante du procès industriel réalisé sur ces sites, à l’exception des canalisations et installations servant à alimenter ces derniers ;
-   la tuyauterie n’est pas située à l’intérieur d’installations domestiques conformément à l’EN 1775 ;
-   la température de conception du système est comprise entre -40 °C et 120 °C inclus.
Pour le biométhane ou l'hydrogène injecté, une évaluation technique détaillée des prescriptions fonctionnelles est nécessaire afin de s'assurer qu'aucun autre composant ou propriété des gaz peut nuire à l'intégrité de la canalisation.
Le présent document ne s’applique pas aux assemblages soudés préexistant à sa publication.
Le présent document spécifie les principes de base communs pour les infrastructures gazières. Il convient que les utilisateurs du présent document gardent à l’esprit l’existence éventuelle, dans les pays membres du CEN, de codes de pratique et/ou de normes nationales plus détaillés.
Le présent document est destiné à être appliqué conjointement avec ces Normes nationales et/ou codes de pratique, qui détaillent les principes de base précités.
En cas de conflits liés à des exigences législatives/réglementaires plus restrictives que les prescriptions du présent document, la législation/réglementation nationale doit prévaloir, comme illustré dans le CEN/TR 13737 (toutes parties).
NOTE   Le CEN/TR 13737 (toutes parties) contient :
-   la clarification de la législation/réglementation pertinente applicable dans un pays ;
-   si approprié, les exigences nationales plus restrictives ;
-   le contact national pour les dernières informations.

Infrastruktura za plin - Varjenje jeklenih cevovodov - Funkcionalne zahteve

General Information

• Status: Not Published
• Public Enquiry End Date: 03-May-2020
• ICS: 25.160.40 - Welded joints and welds
• ICS: 91.140.40 - Gas supply systems
• Technical Committee: DPL - Gas supply
• Current Stage: 4020 - Public enquire (PE) (Adopted Project)
• Start Date: 04-Mar-2020
• Due Date: 22-Jul-2020
• Completion Date: 08-Jun-2020
• Mandate: M/017 - Standardization mandate to CEN in the field of equipment and installation for the transmission and distribution of gas
• Ref Project: FprEN 12732 - Gas infrastructure - Welding steel pipework - Functional requirements

RELATIONS

• Revised: SIST EN 12732:2013+A1:2014 - Gas infrastructure - Welding steel pipework - Functional requirements
• Effective Date: 01-Apr-2020

Standards Content (sample)

SLOVENSKI STANDARD
oSIST prEN 12732:2020
01-april-2020
Infrastruktura za plin - Varjenje jeklenih cevovodov - Funkcionalne zahteve
Gas infrastructure - Welding steel pipework - Functional requirements

Gasinfrastruktur - Schweißen an Rohrleitungen aus Stahl - Funktionale Anforderungen

Infrastructures gazières - Soudage des tuyauteries en acier - Prescriptions fonctionnelles

Ta slovenski standard je istoveten z: prEN 12732
ICS:
25.160.40 Varjeni spoji in vari Welded joints and welds
91.140.40 Sistemi za oskrbo s plinom Gas supply systems
oSIST prEN 12732:2020 en,fr,de

2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.

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oSIST prEN 12732:2020
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oSIST prEN 12732:2020
DRAFT
EUROPEAN STANDARD
prEN 12732
NORME EUROPÉENNE
EUROPÄISCHE NORM
April 2020
ICS 25.160.40 Will supersede EN 12732:2013+A1:2014
English Version
Gas infrastructure - Welding steel pipework - Functional
requirements

Infrastructures gazières - Soudage des tuyauteries en Gasinfrastruktur - Schweißen an Rohrleitungen aus

acier - Prescriptions fonctionnelles Stahl - Funktionale Anforderungen

This draft European Standard is submitted to CEN members for enquiry. It has been drawn up by the Technical Committee

CEN/TC 234.

If this draft becomes a European Standard, 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.

This draft European Standard was established by CEN 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 CEN-CENELEC

Management Centre has the same status as the official versions.

CEN members are the national standards bodies of Austria, Belgium, Bulgaria, Croatia, Cyprus, Czech Republic, Denmark, Estonia,

Finland, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, Netherlands, Norway,

Poland, Portugal, Republic of North Macedonia, Romania, Serbia, Slovakia, Slovenia, Spain, Sweden, Switzerland, Turkey and

United Kingdom.

Recipients of this draft are invited to submit, with their comments, notification of any relevant patent rights of which they are

aware and to provide supporting documentation.

Warning : This document is not a European Standard. It is distributed for review and comments. It is subject to change without

notice and shall not be referred to as a European Standard.
EUROPEAN COMMITTEE FOR STANDARDIZATION
COMITÉ EUROPÉEN DE NORMALISATION
EUROPÄISCHES KOMITEE FÜR NORMUNG
CEN-CENELEC Management Centre: Rue de la Science 23, B-1040 Brussels

© 2020 CEN All rights of exploitation in any form and by any means reserved Ref. No. prEN 12732:2020 E

worldwide for CEN national Members.
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oSIST prEN 12732:2020
prEN 12732:2020 (E)
Contents Page

European foreword ....................................................................................................................................................... 6

1 Scope .................................................................................................................................................................... 7

2 Normative references .................................................................................................................................... 9

3 Terms and definitions ................................................................................................................................ 11

4 Quality system ............................................................................................................................................... 13

4.1 General ............................................................................................................................................................. 13

4.2 Welding contractors .................................................................................................................................... 14

4.3 Welding procedure requirements ......................................................................................................... 14

4.4 Welders ............................................................................................................................................................ 15

4.5 Welding supervisory and coordination personnel .......................................................................... 15

4.6 Testing companies and personnel ......................................................................................................... 15

4.6.1 General ............................................................................................................................................................. 15

4.6.2 Non-destructive testing (NDT) ................................................................................................................ 15

4.6.3 Destructive testing (DT) ............................................................................................................................ 15

5 Welding consumables ................................................................................................................................. 16

6 Production welding ..................................................................................................................................... 16

6.1 General requirements ................................................................................................................................ 16

6.1.1 General ............................................................................................................................................................. 16

6.1.2 Working area ................................................................................................................................................. 16

6.1.3 Layout of weld joints ................................................................................................................................... 17

6.1.4 Types of weld joints ..................................................................................................................................... 17

6.1.5 Weld fit-up ...................................................................................................................................................... 17

6.1.6 Different wall thickness ............................................................................................................................. 17

6.1.7 Laminations .................................................................................................................................................... 17

6.1.8 Interaction of longitudinal or spiral seams at a girth weld .......................................................... 17

6.2 Joint preparation .......................................................................................................................................... 18

6.2.1 Joint end preparation ................................................................................................................................. 18

6.2.2 Alignment of the joints ............................................................................................................................... 18

6.3 Preheating ...................................................................................................................................................... 19

6.4 Tacking ............................................................................................................................................................. 19

6.5 Welding ............................................................................................................................................................ 19

6.6 Actions after welding .................................................................................................................................. 20

6.7 Repair of weld defects ................................................................................................................................ 20

6.8 Destructive testing of production welds for DP over 16 bar ........................................................ 20

7 Attachment-, and in-service welding .................................................................................................... 21

7.1 General ............................................................................................................................................................. 21

7.2 Attachment of structural parts ................................................................................................................ 21

7.3 Attachment of cathodic protection connections ............................................................................... 21

7.4 Hot-tapping and other welding work on in-service pipelines ..................................................... 21

8 Inspection of the weld joint ...................................................................................................................... 22

8.1 General ............................................................................................................................................................. 22

8.2 Scope of inspection ...................................................................................................................................... 22

8.3 Non-destructive testing, assessment levels and acceptance criteria ........................................ 23

8.4 Time of inspection ....................................................................................................................................... 25

8.5 Tie in welds for DP over 16 bar ............................................................................................................... 25

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8.6 Recording of test results ............................................................................................................................ 25

8.7 Requirements for records and documentation ................................................................................. 25

9 Metering, regulating and compressor stations .................................................................................. 26

Annex A (normative) Qualification of pipeline welders and operators of mechanized

welding equipment for steel pipelines ................................................................................................. 27

A.1 General ............................................................................................................................................................. 27

A.2 Additonal requirements to EN ISO 9606-1:2017 and EN ISO 14732:2013 .............................. 27

A.2.1 Welded length ................................................................................................................................................ 27

A.2.2 Welding conditions ...................................................................................................................................... 27

A.2.3 Confirmation of the validity ...................................................................................................................... 27

A.2.4 Revalidation of the welder ........................................................................................................................ 27

A.2.5 Revocation of Qualification ....................................................................................................................... 28

A.2.6 Welders Qualification Test certificate .................................................................................................. 28

A.2.7 Designation ..................................................................................................................................................... 28

A.3 Additional requirements for operators of mechanized welding equipment .......................... 28

Annex B (informative) Testing of lamination defects ................................................................................... 29

Annex C (informative) Time-of-flight diffraction technique (TOFD) ...................................................... 30

C.1 General ............................................................................................................................................................. 30

C.2 Additional and substitutional requirements to EN ISO 10863:2011 ......................................... 30

C.2.1 Addition to the whole document EN ISO 10863:2011 ..................................................................... 30

C.2.2 Addition to EN ISO 10863:2011, Clause 3 “Terms and definitions”............................................ 30

C.2.3 Addition to EN ISO 10863:2011, Clause 5, “Examination Levels” ................................................ 32

C.2.4 Addition to EN ISO 10863:2011, 7.2.2, “Ultrasonic probes” .......................................................... 32

C.2.5 Substitution of EN ISO 10863:2011, Clause 11, 3 paragraph “Weld testing” ...................... 32

C.2.6 Substitution of EN ISO 10863:2011, 12.5.2 “Sizing” ......................................................................... 32

Annex D (normative) Critical aspects for hot-tap welding or welding on in-service pipelines .... 38

D.1 General ............................................................................................................................................................. 38

D.2 procedural requirements .......................................................................................................................... 38

D.3 Supervision ..................................................................................................................................................... 39

D.4 Safety precautions ........................................................................................................................................ 39

D.5 Welding consumables ................................................................................................................................. 40

D.6 Welding procedure specification (WPS) .............................................................................................. 40

D.7 Welding Procedure Qualification for in-service welding ............................................................... 40

D.8 Qualification of the welder ........................................................................................................................ 40

D.9 Weld preparation long seam .................................................................................................................... 40

D.10 Weld preparation circular seam ............................................................................................................. 41

D.11 Repairs .............................................................................................................................................................. 41

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D.12 Non-destructive testing.............................................................................................................................. 41

D.13 Pressure test .................................................................................................................................................. 41

D.14 Documentation .............................................................................................................................................. 41

Annex E (normative) AUT examination of joints ........................................................................................... 42

E.1 Scope ................................................................................................................................................................. 42

E.2 General Requirements ............................................................................................................................... 42

E.3 AUT Quality assurance ............................................................................................................................... 42

E.3.1 Content of the procedure........................................................................................................................... 43

E.3.2 Ultrasonic system equipment and components ................................................................................ 45

E.3.3 Reference blocks .......................................................................................................................................... 45

E.3.4 Recorder set-up ............................................................................................................................................ 46

E.3.5 Circumferential scanning velocity ......................................................................................................... 46

E.3.6 Software ........................................................................................................................................................... 46

E.3.7 Reference line, band position and coating cut-back ........................................................................ 46

E.3.8 Operators ........................................................................................................................................................ 47

E.3.9 Calibration (Sensitivity Setting) ............................................................................................................. 47

E.3.9.1 Initial static calibration ............................................................................................................................. 47

E.3.9.2 Gate settings ................................................................................................................................................... 48

E.3.9.3 Recording threshold ................................................................................................................................... 48

E.3.9.4 Dynamic calibration .................................................................................................................................... 49

E.3.9.5 Recording of set-up data ............................................................................................................................ 49

E.4 Field Inspection ............................................................................................................................................ 49

E.5 Adjustments of the AUT system .............................................................................................................. 51

E.6 Acceptance criteria tier 1 .......................................................................................................................... 51

E.7 Acceptance criteria tier 2 .......................................................................................................................... 53

Annex F (informative) Manual ultrasonic testing of weld joints for wall thickness between

approximately 6 mm and 8 mm .............................................................................................................. 57

F.1 General ............................................................................................................................................................. 57

F.2 Setting of range ............................................................................................................................................. 57

F.3 Sensitivity adjustment when using the Distance Gain Size method .......................................... 57

Annex G (normative) EPRG acceptance criteria ............................................................................................. 61

G.1 EPRG defect acceptance levels and defect limits .............................................................................. 61

G.1.1 Requirements ................................................................................................................................................ 62

Annex H (normative) Visual acceptance criteria according EN ISO 5817:2014 ................................. 69

Annex I (normative) RT acceptance criteria according to EN ISO 10675 and

EN ISO 5817:2014......................................................................................................................................... 71

Annex J (normative) Alternative method and acceptance criteria for UT inspection ...................... 73

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J.1 Distance Gain Size method ........................................................................................................................ 73

J.2 Comparative Element method ................................................................................................................. 73

J.3 General ............................................................................................................................................................. 73

Annex K (informative) Brazing and stud welding of leads for cathodic protection systems ......... 75

K.1 Joining techniques ........................................................................................................................................ 75

K.2 Procedure qualification .............................................................................................................................. 75

K.3 Operation qualification .............................................................................................................................. 76

K.4 Production joints .......................................................................................................................................... 76

Annex L (informative) Significant technical changes between this European Standard and

the previous edition ..................................................................................................................................... 77

Bibliography ................................................................................................................................................................. 78

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oSIST prEN 12732:2020
prEN 12732:2020 (E)
European foreword

This document (prEN 12732:2020) has been prepared by Technical Committee CEN/TC 234 “Gas

infrastructure”, the secretariat of which is held by DIN.
This document is currently submitted to the CEN Enquiry.
This document will supersede EN 12732:2013+A1:2014.

This document has been prepared under the standardization request M/17 given to CEN by the

European Commission and the European Free Trade Association.

Annex L provides details of significant technical changes between this document and the previous

edition.

There is a complete suite of functional standards prepared by CEN/TC 234 “Gas infrastructure” to cover

all parts from the input of gas to the transmission system up to the inlet connection of the gas

appliances, whether for domestic, commercial or industrial purposes.

In preparing this document, a basic understanding of gas infrastructure by the user has been assumed.

Gas infrastructure is complex and the importance on safety of its construction and use has led to the

development of very detailed codes of practice and operating manuals in the member countries. These

detailed statements embrace recognized standards of gas engineering and the specific requirements

imposed by the legal structures of the member countries.

CEN/TC 234 will continue its work updating this standard to the latest developments at regular

intervals.
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oSIST prEN 12732:2020
prEN 12732:2020(E)
1 Scope

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 household installations according to EN 1775;

— the design temperature of the system is between −40 °C up to and including 120 °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.

Table 1 assigns the application areas to quality requirement categories as a function of the working

pressure and pipe materials used.

When using this standard the following is defined by the pipeline operator, the applicable paragraph is

given in brackets;
a) Applicable quality requirement category. (scope)
b) Applicable quality requirements as defined in Table 2. (4.1)

c) Are there specific requirements on VT testing, personnel, and/or qualification. (4.1)

d) Applicable welding qualification standards. (4.3)
e) Are all weld metal tensile tests required. (4.3)

f) When process 311 is used, applicable requirements for welder qualification. (4.4)

g) For category B and C, are batch certificates required for welding consumables, when required the

pipeline operator has to define the contents of the certificate. (Clause 5)

h) For filler materials not in accordance with listed European standards, is batch qualification with

WPQR allowed. (Clause 5)
i) If overmatching weld material is required. (Clause 5)

j) If hot deformation for misalignment compensation is allowed for materials of R ≤ 360 MPa.

t 0,5
(6.2.2)
k) Is the weld always to be covered after completion of welding. (6.6)
l) For category D, requirements for repair welding procedures. (6.7)
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oSIST prEN 12732:2020
prEN 12732:2020 (E)
m) Extent of NDT techniques. (8.2)
n) Alternative acceptance criteria when applicable. (8.3)

o) When alternative criteria in accordance with Annex G are used, if alternative weld overmatching

criteria are applicable.
Table 1 — Allocation to quality requirement categories
Quality
requirement Area of activity applies to
category
≤ 5 bar
Group 1.1, 1.2 and 1.4 according to CEN ISO/TR 15608
R ≤ 360 N/mm
t 0,5
Examples of use: Mains and service pipes in gas distribution systems,
pipework in stations
> 5 bar ≤ 16 bar
Group 1.1, 1.2 and 1.4 according to CEN ISO/TR 15608
R ≤ 360 N/mm
t 0,5
Examples of use: Pipelines including pipework in stations and gas
distribution systems
> 16 bar
Group 1, 2 and 3 according to CEN ISO/TR 15608
Examples of use: Pipelines including pipework in stations and gas
transmission systems
Key
Rt 0,5 is the specified minimum yield strength according to EN ISO 3183

NOTE 1 “Category A” for pipework up to and including 100 mbar, as mentioned in the previous version

EN 12732:2000, has been incorporated in the pressure range of “Category B” and has been deleted from this

table.

NOTE 2 Gas infrastructure with a MOP up to and including 16 bar is generally dedicated to gas distribution.

Pipelines having hoop stresses at design pressure up to 30 % of specified minimum yield strength (R )

t 0,5

and operated at a pressure up to 24 bar may be allocated to quality requirement Category C by the pipeline

operator.
Additional requirements may be specified when, for example:
— the strain on pipelines and systems,
— the materials,
— the line routing,
— the design or the welding technique
are considered critical.
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oSIST prEN 12732:2020
prEN 12732:2020(E)

This document specifies common basic principles for gas infrastructure. Users of this document should

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.
2 Normative references
The
...