SIST EN ISO 13703-3:2023

Oil and gas industries including lower carbon energy - Piping systems on offshore production platforms and onshore plants - Part 3: Fabrication (ISO 13703-3:2023)

This document defines requirements for the fabrication, welding, examination and testing of new, metallic piping systems up to 69 000 kPa (ga) maximum, within temperature range limits for the materials meeting the requirements of ASME B31.3, on fixed and floating offshore production facilities and onshore production, processing and liquefaction plants.
This document is applicable to all pressure retaining components and any non-pressure retaining component, such as a pipe support, welded directly to a pressure retaining component.
This document is not applicable to:
- marine-related piping systems, e.g. ballasting piping systems, systems covered by classification societies;
- non-metallic piping systems.

Öl- und Gasindustrie einschließlich kohlenstoffarmer Energieträger - Rohrleitungssysteme auf Offshore-Förderplattformen und Onshore-Anlagen - Teil 3: Herstellung (ISO 13703-3:2023)

Dieses Dokument legt Anforderungen an die Herstellung, den Einbau, das Schweißen, die Inspektion, die Überprüfung und die Prüfung von neuen, metallischen Rohrleitungssystemen innerhalb der Temperaturgrenzwerte für die Werkstoffe, die die Anforderungen nach ASME B31.3 erfüllen, auf festen und schwimmenden Offshore-Förderanlagen und Onshore-Förder-, Verarbeitungs- und Gasverflüssigungsanlagen fest. Für Rohrleitungssysteme oberhalb der Druckklasse 2500 sind zusätzlich zu den in dieser Norm angeführten Anforderungen die Anforderungen von ASME B31.3, Kapitel IX, zu erfüllen.
Dieses Dokument ist für alle Druck tragenden Bauteile und alle nicht Druck tragenden Bauteile anwendbar, wie z. B. ein Element einer Rohrabstützung, das direkt an ein Druck tragendes Bauteil geschweißt wird.
Dieses Dokument ist nicht anwendbar auf Folgendes:
   marine Rohrleitungssysteme, z. B. Ballast-Rohrleitungssysteme, Systeme, die von Klassifizierungsgesellschaften abgedeckt werden;
   Steigrohre aus Metall, die für Unterwasser-Versorgungssysteme verwendet werden;
ANMERKUNG 1   Für das Schweißen und die Überprüfung dieser Bauteile kann auf ISO 13628 5 oder API Spec 17E verwiesen werden.
   Rohrleitungssysteme mit korrosionsbeständiger Plattierung (entweder ganzheitlich plattiert oder mechanisch ausgekleidet) oder Schweißüberzug, einschließlich Puffern und zugehöriger Mischschweißnähte;
ANMERKUNG 2   Für das Schweißen und die Überprüfung dieser Systeme kann auf DNV-RP-B204 verwiesen werden.
   feuerfeste Legierungen [mit Ausnahme von CP-Titan Klasse 1 (UNS R50250) oder Klasse 2 (UNS R50400)];
   nichtmetallische Rohrleitungsbaugruppen;
   Transport-Rohrleitungssysteme, einschließlich Durchflussleitungen, die in Übereinstimmung mit einer anerkannten technischen Regel zur Konstruktion von Rohrleitungen ausgelegt wurden.

Industries du pétrole et du gaz, y compris les énergies à faible émission de carbone - Conception et installation des systèmes de tuyauterie sur les plates-formes de production en mer et les installations à terre - Partie 3: Fabrication (ISO 13703-3:2023)

Naftna in plinska industrija, vključno z nizkoogljično energijo - Cevni sistemi na plavajočih proizvodnih objektih in kopenskih obratih - 3. del: Izdelava (ISO 13703-3:2023)

Ta dokument določa zahteve za izdelavo, varjenje, pregledovanje in preskušanja novih kovinskih cevnih sistemov do največ 69.000 kPa (ga) znotraj meja temperaturnega območja za materiale, ki izpolnjujejo zahteve ASME B31.3 na pritrjenih in nepritrjenih plavajočih proizvodnih obratih ter v kopenskih obratih za proizvodnjo, obdelavo in utekočinjanje.
Dokument se uporablja za vse komponente, ki zadržujejo tlak, in tiste, ki ga ne, npr. cevna držala, varjena neposredno na komponento, ki zadržuje tlak.
Dokument se ne uporablja za:
– cevne sisteme, povezane s pomorstvom, npr. balastni cevni sistemi, sistemi, ki jih zajemajo klasifikacijski zavodi;
– nekovinske cevne sisteme.

General Information

• Status: Published
• Public Enquiry End Date: 31-Dec-2020
• Publication Date: 24-Oct-2023
• ICS: 75.180.10 - Exploratory, drilling and extraction equipment
• Technical Committee: I13 - Imaginarni 13
• Current Stage: 6060 - National Implementation/Publication (Adopted Project)
• Start Date: 11-Oct-2023
• Due Date: 16-Dec-2023
• Completion Date: 25-Oct-2023
• Ref Project: EN ISO 13703-3:2023 - Oil and gas industries including lower carbon energy - Piping systems on offshore production platforms and onshore plants - Part 3: Fabrication (ISO 13703-3:2023)

Overview

SIST EN ISO 13703-3:2023 (ISO 13703-3:2023) - Oil and gas industries including lower carbon energy - Piping systems on offshore production platforms and onshore plants - Part 3: Fabrication - defines fabrication requirements for new metallic piping systems used in oil, gas and lower‑carbon energy facilities. The standard applies to fixed and floating offshore production facilities and onshore production, processing and liquefaction plants for pressure‑retaining systems up to 69 000 kPa (gauge) and to non‑pressure parts welded directly to pressure components. It excludes marine‑related piping covered by classification societies and non‑metallic piping.

Key topics and technical requirements

ISO 13703-3 focuses on practical fabrication controls and inspection practices. Major topics include:

• Welding requirements: general rules, approved welding processes, preparation, qualification of welders and operators.
• Welding consumables: selection and requirements for carbon steels, stainless steels (including duplex grades) and high‑alloy materials; shielding/backing gases.
• Welding procedure qualification (WPQ/WPS): essential variables, additional rules for specific alloys, and sour‑service considerations.
• Preheat and post‑weld heat treatment (PWHT): requirements for minimizing residual stress and ensuring metallurgical integrity.
• Pipe bending: cold bending and hot induction bending requirements and heat treatment of bends.
• Installation and joints: threaded and bolted connection practices and mechanical assembly controls.
• Inspection, examination and testing: visual (VT), magnetic particle (MT), liquid penetrant (PT), radiographic (RT), ultrasonic (UT), positive material identification (PMI), production and leak testing, ferrite testing of weld metal and repair criteria.
• Cleaning, preservation and leak/tightness testing: flushing, preservation and commissioning checks.
• Annexes: informative guidance (e.g., oxidation images) and normative requirements for bending processes; includes guidance relevant to the European Pressure Equipment Directive (PED).

Practical applications and users

This standard is used to ensure fabrication quality, safety and regulatory compliance for onshore and offshore piping in hydrocarbon and lower‑carbon energy projects. Typical users:

• EPC contractors and piping fabricators
• Welding engineers and welding supervisors
• NDE/inspection teams and QA/QC engineers
• Plant owners/operators and maintenance teams
• Project managers specifying fabrication acceptance criteria

Adopting ISO 13703-3 helps reduce fabrication defects, ensures consistent welding and inspection practices, and supports safe commissioning and operation of high‑pressure piping systems.

Related standards and references

• ASME B31.3 - referenced for material temperature limits and related piping design requirements.
• European Pressure Equipment Directive (PED) - guidance included in Annex D.
• Applicable NDE and welding standards (refer to normative references in the standard).

Keywords: ISO 13703-3, piping systems fabrication, offshore production platforms, onshore plants, welding procedure qualification, non‑destructive examination, preheat PWHT, pressure retaining components.

Standards Content (Sample)

SLOVENSKI STANDARD
01-december-2023
Naftna in plinska industrija, vključno z nizkoogljično energijo - Cevni sistemi na
plavajočih proizvodnih objektih in kopenskih obratih - 3. del: Izdelava (ISO 13703-
3:2023)
Oil and gas industries including lower carbon energy - Piping systems on offshore
production platforms and onshore plants - Part 3: Fabrication (ISO 13703-3:2023)
Öl- und Gasindustrie einschließlich kohlenstoffarmer Energieträger -
Rohrleitungssysteme auf Offshore-Förderplattformen und Onshore-Anlagen - Teil 3:
Herstellung (ISO 13703-3:2023)
Industries du pétrole et du gaz, y compris les énergies à faible émission de carbone -
Conception et installation des systèmes de tuyauterie sur les plates-formes de
production en mer et les installations à terre - Partie 3: Fabrication (ISO 13703-3:2023)
Ta slovenski standard je istoveten z: EN ISO 13703-3:2023
ICS:
75.180.10 Oprema za raziskovanje, Exploratory, drilling and
vrtanje in odkopavanje extraction equipment
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.

EN ISO 13703-3
EUROPEAN STANDARD
NORME EUROPÉENNE
October 2023
EUROPÄISCHE NORM
ICS 75.180.10
English Version
Oil and gas industries including lower carbon energy -
Piping systems on offshore production platforms and
onshore plants - Part 3: Fabrication (ISO 13703-3:2023)
Industries du pétrole et du gaz, y compris les énergies Öl- und Gasindustrie einschließlich kohlenstoffarmer
à faible émission de carbone - Conception et Energieträger - Rohrleitungssysteme auf Offshore-
installation des systèmes de tuyauterie sur les plates- Förderplattformen und Onshore-Anlagen - Teil 3:
formes de production en mer et les installations à terre Herstellung (ISO 13703 3:2023)
- Partie 3: Fabrication (ISO 13703-3:2023)
This European Standard was approved by CEN on 30 September 2023.

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 CEN-CENELEC Management Centre 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 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, Türkiye and
United Kingdom.
EUROPEAN COMMITTEE FOR STANDARDIZATION
COMITÉ EUROPÉEN DE NORMALISATION

EUROPÄISCHES KOMITEE FÜR NORMUNG

CEN-CENELEC Management Centre: Rue de la Science 23, B-1040 Brussels
© 2023 CEN All rights of exploitation in any form and by any means reserved Ref. No. EN ISO 13703-3:2023 E
worldwide for CEN national Members.

Contents Page
European foreword . 3

European foreword
This document (EN ISO 13703-3:2023) has been prepared by Technical Committee ISO/TC 67 "Oil and
gas industries including lower carbon energy" in collaboration with Technical Committee CEN/TC 12
“Oil and gas industries including lower carbon energy” the secretariat of which is held by NEN.
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 April 2024, and conflicting national standards shall be
withdrawn at the latest by April 2024.
Attention is drawn to the possibility that some of the elements of this document may be the subject of
patent rights. CEN shall not be held responsible for identifying any or all such patent rights.
Any feedback and questions on this document should be directed to the users’ national standards
body/national committee. A complete listing of these bodies can be found on the CEN website.
According to the CEN-CENELEC Internal Regulations, the national standards organizations of the
following countries are bound to implement this European Standard: 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, Türkiye and the
United Kingdom.
Endorsement notice
The text of ISO 13703-3 has been approved by CEN as EN ISO 13703-3:2023 without any modification.

INTERNATIONAL ISO
STANDARD 13703-3
First edition
2023-09
Oil and gas industries including lower
carbon energy — Piping systems on
offshore production platforms and
onshore plants —
Part 3:
Fabrication
Industries du pétrole et du gaz, y compris les énergies à faible
émission de carbone — Conception et installation des systèmes
de tuyauterie sur les plates-formes de production en mer et les
installations à terre —
Partie 3: Fabrication
Reference number
ISO 13703-3:2023(E)
ISO 13703-3:2023(E)
© ISO 2023
All rights reserved. Unless otherwise specified, or required in the context of its implementation, no part of this publication may
be reproduced or utilized otherwise in any form or by any means, electronic or mechanical, including photocopying, or posting on
the internet or an intranet, without prior written permission. Permission can be requested from either ISO at the address below
or ISO’s member body in the country of the requester.
ISO copyright office
CP 401 • Ch. de Blandonnet 8
CH-1214 Vernier, Geneva
Phone: [phone]
Email: [e-mail]
Website: www.iso.org
Published in Switzerland
ii
ISO 13703-3:2023(E)
Contents Page
Foreword .v
Introduction . vi
1 Scope . 1
2 Normative references . 1
3 Terms and definitions . 3
4 Abbreviated terms . 7
4.1 Symbols . 7
4.2 Abbreviated terms . 7
5 Health, safety and quality requirements . 9
5.1 Health and safety requirements . 9
5.2 Quality requirements . 10
6 Welding requirements .11
6.1 General requirements . 11
6.2 Welding processes . 12
6.3 Preparation for welding .12
6.4 Welder and welding operator performance qualification . 15
7 Welding consumables .15
7.1 General requirements .15
7.2 Additional requirements for carbon steel . 17
7.3 Additional requirements for dissimilar welding . 17
7.4 Additional requirements for SS 300-series . 17
7.5 Additional requirements for SS type 22Cr duplex and SS type 25Cr duplex . 17
7.6 Additional requirements for high alloy stainless steels . 17
7.7 Shielding, backing and secondary trailing gases . 18
8 Welding procedure qualification .18
8.1 General requirements . 18
8.2 Additional requirements for carbon steels . 19
8.3 Additional requirements for SS type 22Cr duplex and SS type 25Cr duplex . 19
8.4 Additional requirements for high alloyed austenitic stainless steels .20
8.5 Additional requirements for CP titanium . 20
8.6 Additional requirements for materials in sour service . 20
8.7 Welding procedure qualification essential variable . 21
9 Preheat and post weld heat treatment’ .23
9.1 Preheating . 23
9.2 Post weld heat treatment . 24
10 Bending of pipe .26
10.1 General requirements . 26
10.2 Heat treatment of bends . . 29
10.3 Examination of bends .30
11 Installation .31
11.1 General requirements . 31
11.2 Threaded connections . 31
11.3 Bolted connections . 31
12 Inspection, examination and testing .32
12.1 General requirements . 32
12.2 Visual examination . 35
12.3 Magnetic particle examination .36
12.4 Liquid penetrant examination . 36
12.5 Radiographic examination .36
iii
ISO 13703-3:2023(E)
12.6 Ultrasonic examination . 37
12.7 Positive materials identification .38
12.8 Production testing . 39
12.9 Weld metal ferrite testing .40
12.10 Repairs and replacement . 41
13 Cleaning, leak testing and preservation.42
13.1 General requirements . 42
13.2 Flushing and cleaning. 43
13.3 Leak testing .44
13.4 Tightness testing . 45
13.5 Preservation .46
Annex A (informative) Reference images for oxidation of weldments .47
Annex B (normative) Requirements for cold bending of pipes .51
Annex C (normative) Requirements for hot induction bending of pipes .54
Annex D (informative) Guidance to European Pressure Equipment Directive .56
Bibliography .57
iv
ISO 13703-3:2023(E)
Foreword
ISO (the International Organization for Standardization) is a worldwide federation of national standards
bodies (ISO member bodies). The work of preparing International Standards is normally carried out
through ISO technical committees. Each member body interested in a subject for which a technical
committee has been established has the right to be represented on that committee. International
organizations, governmental and non-governmental, in liaison with ISO, also take part in the work.
ISO collaborates closely with the International Electrotechnical Commission (IEC) on all matters of
electrotechnical standardization.
The procedures used to develop this document and those intended for its further maintenance are
described in the ISO/IEC Directives, Part 1. In particular, the different approval criteria needed for the
different types of ISO document should be noted. This document was drafted in accordance with the
editorial rules of the ISO/IEC Directives, Part 2 (see www.iso.org/directives).
ISO draws attention to the possibility that the implementation of this document may involve the use
of (a) patent(s). ISO takes no position concerning the evidence, validity or applicability of any claimed
patent rights in respect thereof. As of the date of publication of this document, ISO had not received
notice of (a) patent(s) which may be required to implement this document. However, implementers are
cautioned that this may not represent the latest information, which may be obtained from the patent
database available at www.iso.org/patents. ISO shall not be held responsible for identifying any or all
such patent rights.
Any trade name used in this document is information given for the convenience of users and does not
constitute an endorsement.
For an explanation of the voluntary nature of standards, the meaning of ISO specific terms and
expressions related to conformity assessment, as well as information about ISO's adherence to
the World Trade Organization (WTO) principles in the Technical Barriers to Trade (TBT), see
www.iso.org/iso/foreword.html.
This document was prepared by Technical Committee ISO/TC 67, Oil and gas industries including lower
carbon energy, Subcommittee SC 6, Process equipment, piping, systems, and related safety, in collaboration
with the European Committee for Standardization (CEN) Technical Committee CEN/TC 12, Materials,
equipment and offshore structures for petroleum, petrochemical and natural gas industries, in accordance
with the Agreement on technical cooperation between ISO and CEN (Vienna Agreement).
This first edition of ISO 13703-3, together with ISO 13703-1 and ISO 13703-2, cancels and replaces
ISO 13703:2000. It also incorporates the Technical Corrigendum ISO 13703:2000/Cor.1:2002.
The main changes compared to the previous edition are as follows:
— deletion of the installation and quality control requirements of Clause 10;
— deletion of previous Annex C as requirements are addressed in ASME B31.3.
A list of all parts in the ISO 13703 series can be found on the ISO website.
Any feedback or questions on this document should be directed to the user’s national standards body. A
complete listing of these bodies can be found at www.iso.org/members.html.
v
ISO 13703-3:2023(E)
Introduction
The aim of this document is to establish common requirements for the fabrication, welding, inspection,
examination and testing of new, metallic process piping systems designed in accordance with the
requirements of ISO 13703-1, and using bulk piping materials in accordance with ISO 13703-2.
This document makes normative reference to ASME B31.3 as the base code for process piping.
Alternative codes to ASME B31.3 exist for the fabrication, welding, inspection, examination and testing
of process piping systems along with the potential need to comply with local or national regulatory/
jurisdictional requirements. The user of this document is expected to assess the implications arising
from local or national regulatory/jurisdictional requirements in implementing the requirements
herein, including the need to specify additional requirements to those stated. ASME B31.3, Appendix N
provides guidance on its use internationally, and specifically its use within the European Union
for which additional requirements to those specified in ASME B31.3 will be necessary to meet the
requirements of Directive 2014/68/EU on the harmonization of the laws of the Member States relating
to the making available on the market of pressure equipment (PED).
This document is not intended to inhibit a user from accepting alternative fabrication, welding,
examination or testing solutions for the individual application. This can be particularly appropriate
where there is innovative or developing technology. Where an alternative to the requirements in
this document is offered, the user is expected to review the implications in meeting the performance
requirements within this document.
vi
INTERNATIONAL STANDARD ISO 13703-3:2023(E)
Oil and gas industries including lower carbon energy —
Piping systems on offshore production platforms and
onshore plants —
Part 3:
Fabrication
1 Scope
This document specifies requirements for the fabrication, installation, welding, inspection, examination
and testing of new, metallic piping systems , within temperature range limits for the materials meeting
the requirements of ASME B31.3, on fixed and floating offshore production facilities and onshore
production, processing and gas liquefaction plants. For piping systems above pressure class 2500,
the requirements of chapter IX of ASME B31.3 shall be complied with, in addition to the requirements
stated in this standard.
This document is applicable to all pressure retaining components and any non-pressure retaining
component, such as a member of a pipe support, welded directly to a pressure retaining component.
This document is not applicable to the following:
— marine-related piping systems, e.g. ballasting piping systems, systems covered by classification
societies;
— metallic tubing used for subsea umbilical systems;
NOTE 1 Reference can be made to ISO 13628-5 or API Spec 17E for welding and examination of these
components.
— piping systems with corrosion resistant cladding (either integrally clad or mechanically lined) or
weld overlay, including buttering and associated dissimilar welds;
NOTE 2 Reference can be made to DNV-RP-B204 for welding and examination of these systems.
— refractory alloys [with exception of CP titanium Grade 1 (UNS R50250) or Grade 2 (UNS R50400)];
— non-metallic piping assemblies;
— transportation pipeline systems, including flow-lines, designed in accordance with a recognized
pipeline design code.
2 Normative references
The following documents are referred to in the text in such a way that some or all of their content
constitutes requirements of this document. For dated references, only the edition cited applies. For
undated references, the latest edition of the referenced document (including any amendments) applies.
ISO 3834-2, Quality requirements for fusion welding of metallic materials — Part 2: Comprehensive quality
requirements
ISO 8249, Welding — Determination of Ferrite Number (FN) in austenitic and duplex ferritic-austenitic Cr-
Ni stainless steel weld metals
ISO 13703-3:2023(E)
ISO 9015-1, Destructive tests on welds in metallic materials — Hardness testing — Part 1: Hardness test on
arc welded joints
ISO 9606 (all parts), Qualification testing of welders — Fusion welding
ISO 9712, Non-destructive testing — Qualification and certification of NDT personnel
ISO 10474, Steel and steel products — Inspection documents
ISO 11666:2018, Non-destructive testing of welds — Ultrasonic testing — Acceptance levels
ISO 11699-1, Non-destructive testing — Industrial radiographic film — Part 1: Classification of film
systems for industrial radiography
ISO 14175, Welding consumables — Gases and gas mixtures for fusion welding and allied processes
ISO 14344, Welding consumables — Procurement of filler materials and fluxes
ISO 14731, Welding coordination — Tasks and responsibilities
ISO 14732, Welding personnel — Qualification testing of welding operators and weld setters for mechanized
and automatic welding of metallic materials
ISO 15156-2, Petroleum and natural gas industries — Materials for use in H2S containing environments in
oil and gas production — Part 2: Cracking-resistant carbon and low alloy steels, and the use of cast irons
ISO 15156-3, Petroleum and natural gas industries — Materials for use in H2S containing environments in
oil and gas production — Part 3: Cracking-resistant CRAs (corrosion-resistant alloys) and other alloys
ISO 15609-1, Specification and qualification of welding procedures for metallic materials — Welding
procedure specification — Part 1: Arc welding
ISO 15614-1, Specification and qualification of welding procedures for metallic materials — Welding
procedure test — Part 1: Arc and gas welding of steels and arc welding of nickel and nickel alloys
ISO 15614-5, Specification and qualification of welding procedures for metallic materials — Welding
procedure test — Part 5: Arc welding of titanium, zirconium and their alloys
ISO 15614-6, Specification and qualification of welding procedures for metallic materials — Welding
procedure test — Part 6: Arc and gas welding of copper and its alloys
ISO/IEC 17025, General requirements for the competence of testing and calibration laboratories
ISO 17636-2, Non-destructive testing of welds — Radiographic testing — Part 2: X- and gamma-ray
techniques with digital detectors
ISO 17781:2017, Petroleum, petrochemical and natural gas industries — Test methods for quality control
of microstructure of ferritic/austenitic (duplex) stainless steels
ISO 18265, Metallic materials — Conversion of hardness values
ISO 22825, Non-destructive testing of welds — Ultrasonic testing — Testing of welds in austenitic steels
and nickel-based alloys
ANSI Z49.1, Safety in Welding, Cutting and Allied Processes
API RP 686, Machinery Installation and Installation Design
ASME B31.3, Process Piping
ASME Boiler and Pressure Vessel Code, Section II, Materials, Part C:2019, Specifications for welding
rods, electrodes, and filler metals
ASME Boiler and Pressure Vessel Code, Section V:2019, Non Destructive Testing
ISO 13703-3:2023(E)
ASME Boiler and Pressure Vessel Code, Section IX: 2019, Welding and Brazing Qualifications
ASNT CP-189, Standard for Qualification and Certification of Nondestructive Testing Personnel
ASNT SNT-TC-1A, Personnel Qualification and Certification in Nondestructive Testing
ASTM A380/A380M, Standard Practice for Cleaning, Descaling, and Passivation of Stainless Steel Parts,
Equipment, and Systems
ASTM E140, Standard Hardness Conversion Tables for Metals Relationship Among Brinell Hardness, Vickers
Hardness, Rockwell Hardness, Superficial Hardness, Knoop Hardness, Scleroscope Hardness, and Leeb
Hardness
ASTM E1815, Standard Test Method for Classification of Film Systems for Industrial Radiography
ASTM G48, Standard Test Methods for Pitting and Crevice Corrosion Resistance of Stainless Steels and
Related Alloys by Use of Ferric Chloride Solution
AWS A4.2M, Standard Procedures for Calibrating Magnetic Instruments to Measure the Delta Ferrite
Content of Austenitic and Duplex Ferritic-Austenitic Stainless Steel
AWS D10.10/D10.10M, Recommended Practices for Local Heating of Welds in Piping and Tubing
EN 10204, Metallic products — Types of inspection documents
PFI ES-3, Fabricating Tolerances
3 Terms and definitions
For the purposes of this document, the following terms and definitions apply.
ISO and IEC maintain terminology databases for use in standardization at the following addresses:
— ISO Online browsing platform: available at https:// www .iso .org/ obp
— IEC Electropedia: available at https:// www .electropedia .org/
3.1
alkaline service
service environments containing alkaline compounds such as amines, caustic, carbonates
3.2
bolted connection
connections with bolts, to allow assembly and disassembly, that uses flanges or clamps as connectors.
3.3
carbon equivalent
C
E
numerical value for a steel’s composition that represents the contribution of the relevant elements to
the hydrogen cracking susceptibility of steel
Note 1 to entry: The carbon equivalent is based on:
%%Mn Cr++%%Mo V %%Ni+ Cu
     
CC=+% + +
E      
65 15
     
where all mass fractions are expressed in percent.
ISO 13703-3:2023(E)
3.4
closure weld
final weld connecting piping systems, assemblies or sub-assemblies that have been successfully leak
tested, but that itself is not subject to leak testing
Note 1 to entry: Closure welds include any welds made after leak or tightness testing, such as seal welds to
threaded connections, or repair welds made in the event of a leak that are not subject to further leak test.
Note 2 to entry: Closure welds are often also referred to as ‘golden welds’.
3.5
computerized imaging technique
CIT
manual or encoded ultrasonic examination technique with capability for computer processed display
or analysis and display of ultrasonic data to provide two or three dimensional surfaces
3.6
confined space
space that is substantially but not necessarily entirely enclosed, and where serious injury can occur
from hazardous substances or conditions within the space or nearby (e.g. lack of oxygen)
Note 1 to entry: Confined space includes access into the internal bore of pipes to install, inspect and remove
internal backing gas dams, and during cleaning, flushing, leak and tightness testing activities.
3.7
cryogenic service
service environments with a minimum design temperature lower than –104 °C
3.8
low-alloy steel
steel with significant alloy additions (e.g. Groups 4 to 6 according to ISO 15608, or P-No. 3 to P-No 5 and
P-No. 15E according to ASME B31.3)
3.9
extrados
outer curved portion of a bend
3.10
fabricator
organization responsible for the fabrication, welding, examination and testing of piping systems
including any externally provided products or services
Note 1 to entry: For the purposes of this document, “fabricator” is considered interchangeable with
“manufacturer”, “erector”, “employer” or “purchaser” where these terms are used in referenced documents.
3.11
fibre elongation
elongation during bending or forming calculated as 100 r/R expressed as percentage
Note 1 to entry: Fibre elongation can be determined by physical measurement or calculation.
3.12
heat input
energy introduced into the weld region during welding per unit run length
Note 1 to entry: The reference for the calculation of heat input is ASME Boiler and Pressure Vessel Code,
Section IX: 2019 for the specific welding process.
ISO 13703-3:2023(E)
3.13
high alloyed stainless steel
austenitic stainless steel typically having PREN ≥ 40 or [% Ni + 2 (% Mo)] > 30 where % Mo > 2, where
all mass fractions are expressed as percent
EXAMPLE SS type 6Mo or SS type 565.
3.14
intrados
inner curved portion of a bend
3.15
leak testing
application of a pressure load greater than the design load to demonstrate the integrity of a piping
assembly to safely withstand the design load
Note 1 to entry: Leak testing is also referred to as “hydrostatic leak testing” or “pneumatic leak testing”, or
combination thereof, as defined in ASME B31.3.
3.16
lot
totality of welds completed by all welders, and accepted by visual examination on any one day, unless
otherwise defined in the engineering design
[SOURCE: PFI ES48: 2015]
3.17
low sulfur oil
heating oil with maximum sulfur content of 1 000 ppm
3.18
nepheleometric turbidity units
NTU
measurement of water turbidity
3.19
owner
person, partnership, organization or business ultimately responsible for design, construction,
operation, and maintenance of a facility
3.20
pitting resistance equivalent number
number indicating the resistance of stainless steels to pitting corrosion and related to chemical
composition
Note 1 to entry: PREN is calculated from one of the following formulas:
PREN = % Cr + 3,3 % Mo + 16 % N
PREN = % Cr + 3,3 % (Mo + 0,5 W) + 16 % N
where all mass fractions are expressed as percent.
Note 2 to entry: All PREN limits are absolute limits based upon the heat analysis. The calculated value shall not
be rounded.
3.21
sour service
service environments that contain sufficient H S to cause cracking of materials
Note 1 to entry: For the purpose of the document, the mechanisms that result in cracking are addressed in
ISO 15156-2 or ISO 15156-3.
ISO 13703-3:2023(E)
Note 2 to entry: For the purpose of this document, ANSI/NACE MR0175 is equivalent to ISO 15156-2 and
ISO 15156-3, respectively.
3.22
stainless steel 300-series
SS 300-seriesaustenitic stainless steel with at least 16 % Cr (mass fraction) and 8 % Ni (mass fraction)
possibly with other elements added to secure special properties
Note 1 to entry: Low carbon grades are typically used where welding is required.
EXAMPLE UNS S30400, UNS S30403, UNS S31600, UNS S31603.
3.23
stainless steel type 22Cr duplex
SS type 22Cr duplex
ferritic/austenitic stainless steel alloys with 30,0 < PREN < 40,0 and Cr ≥ 19 % (mass fraction)
EXAMPLE UNS S31803, UNS S32205.
3.24
stainless steel type 25Cr duplex
SS type 25Cr duplex
ferritic/austenitic stainless steel alloys with 40,0 ≤ PREN < 48,0
Note 1 to entry: This alloy is often referred to as “super duplex”.
EXAMPLE UNS S S32505, UNS S32550, UNS S32750, UNS S32760, UNS S39274, UNS S39277.
3.25
stainless steel type 6Mo
SS type 6Mo
austenitic stainless steel with PREN ≥ 40 and a nominal Mo alloying content of 6 % (mass fraction) and
nickel alloys with Mo content in the range 6 % to 8 % (mass fraction)
EXAMPLE UNS S31254, UNS N08367, UNS N08926.
3.26
stainless steel type 565
SS type 565
manganese austenitic stainless steel with Mn content in the range 4 % to 12 % (mass fraction) and
PREN ≥ 40
EXAMPLE UNS S34565.
3.27
tangent
straight section at the end of a bend
3.28
tightness testing
application of a pressure differential to a piping assembly to detect leakage paths or rates
Note 1 to entry: Tightness testing includes testing of mechanically completed piping systems as part of pre-
commissioning activities, and sensitive leak tests as defined in ASME B31.3.
3.29
transition zone
areas of the start and stop points of induction heating, which include material that extends from the
unheated mother pipe to the material that has been heated to the full bending temperature
3.30
weave bead
weld bead formed using weaving. See also stringer bead.
ISO 13703-3:2023(E)
3.31
weaving
welding technique in which the energy source is oscillated transversely as it progresses along the weld
path
3.32
weld zone
grouping of weld passes with similar parameters and function, e.g. root, fill and cap
3.33
stringer bead
weld bead formed without appreciable weaving
4 Abbreviated terms
4.1 Symbols
D nominal pipe diameter, expressed in millimetres
H heated band width, expressed in millimetres
BW
h Maximum misalignment at a buttweld seam
L length, expressed in millimetres
R nominal bending radius to centreline of pipe, expressed in millimetres
r nominal outside radius of the pipe, expressed in millimetres
t nominal material thickness at the weld, expressed in millimetres
U Geometric unsharpness
g
4.2 Abbreviated terms
AUT Automatic Ultrasonic Testing
AWS American Welding Society
aMDEA activated MDEA
CMTR certified material test report
CP commercially pure (in relation to titanium materials)
CRA corrosion resistant alloy
CSWIP certification scheme for weldment inspection personnel
CWEng certified welding engineer
DGA di-glycol amine
DIPA di-iso propyl amine
ECA engineering critical assessment
EEA European economic area
ISO 13703-3:2023(E)
EWE European welding engineer
EWF European Welding Federation
FCAW-G flux cored arc welding – gas shielded
FCAW-S flux cored arc welding – self shielded
FMC/TFM full matrix capture/total focussing method
FN ferrite number
GMAW gas metal arc welding
GMAW-S gas metal arc welding – short circuiting mode of transfer
GTAW gas tungsten arc welding
HAZ heat affected zone
HBW heated band width (of PWHT)
HIP hot isostatic pressed
HRC Rockwell C hardness number
HV Vickers hardness number
IIW International Institute of Welding
ITP inspection and test plan
IWE international welding engineer
MDEA methyldiethanolamine
MDMT minimum design metal temperature (synonymous with design minimum temperature
as defined in ASME B31.3)
MEA mono ethanolamine
MT magnetic particle testing (for use on magnetic materials)
NDT non-destructive testing
NTU neophelemetric turbidity units
OES optical emission spectrometry
PAUT phased array ultrasonic testing technique
PCN Personal Certification for Non-Destructive Testing
PED Pressure Equipment Directive (European Directive 2014/68/EU) see Annex D
PMI positive materials identification
PREN pitting resistance equivalent number
PT liquid penetrant testing (for use on non-magnetic materials)
PQR procedure qualification record
ISO 13703-3:2023(E)
PWHT post weld heat treatment
QL quality level
QMS quality management system
RT radiographic testing
SAW submerged arc welding
SMAW shielded metal arc welding
SMYS specified minimum yield stress
SS stainless steel
SSC sulphide stress cracking
SWPS standard welding procedure specification
TOFD time of flight diffraction
WPS welding procedure specification
UNS unified numbering system
UT ultrasonic testing
5 Health, safety and quality requirements
5.1 Health and safety requirements
5.1.1 The fabricator shall at least provide the following safety equipment and systems:
a) ventilation and extraction facilities for welding-related activities or work in a confined space;
b) personal protective equipment including eye, breathing and hearing protection;
c) access/scaffolding/working platforms and fall-arrest protective equipment for working at height;
d) access and secure, temporary formwork for working below-grade;
e) protective systems to prevent electric shock, build-up or discharge of static electricity, and earthing
of welding current through susceptible components in the piping assembly;
f) ‘whip checks’ on test hoses for flushing, cleaning, leak testing/tightness testing.
5.1.2 All work undertaken in a confined space shall be managed using a permit-to-work system.
NOTE 1 ISO 45001 specifies requirements for an occupational health and safety management system, and
gives guidance for its use, to enable organizations to provide safe and healthy workplaces by preventing work-
related injury and ill health, as well as by proactively improving its occupational health and safety performance.
IOGP Report 423 describes a process by which clients can select suitable contractors, set out expectations and
requirements, award contracts, and manage all the phases of the contracting process with a view to improving
client and contractor management of health, safety and environmental risks for contracted activities.
Note 2 ANSI Z49.1 and ISO/TR/18786 give specific requirements and guidance on safety in Welding
fabrication activities.
ISO 13703-3:2023(E)
5.2 Quality requirements
5.2.1 The fabricator shall operate in accordance with a QMS that meets an internationally recognized
standard.
NOTE ISO 29001 and API Spec Q1 give sector-specific requirements and guidance on quality management
systems.
5.2.2 The QMS of the fabricator shall include the following requirements related to the responsibilities
for welding, inspection and testing personnel specified:
a) the organization shall meet the comprehensive welding quality requirements of ISO 3834-2;
b) welding coordination personnel shall demonstrate that they meet the requirements of ISO 14731
by either comprehensive level of competency or specific level of competency as appropriate for the
relevant essential welding-related tasks described in ISO 3834-2;
NOTE 1 For the purposes of this provision, personnel with AWS CWEng certification in conformance to
AWS B5.16 can be considered equivalent to personnel holding EWF European welding engineer (EWE) or
IIW international welding engineer (IWE) certification as explained in EWF Publication EWF-663-19 and
IIW publication IAB-362-19, respectively.
c) welding inspection
...