prEN ISO 15156-3

SLOVENSKI STANDARD
01-marec-2026
Naftna in plinska industrija, vključno z nizkoogljično energijo - Materiali za
uporabo v okoljih s H2S v proizvodnji olja in plina - 3. del: Zahteve za preverjanje,
kvalifikacijo in glasovanje (ISO/DIS 15156-3:2025)
Oil and gas industries including lower carbon energy - Materials for use in H2S-
containing environments in oil and gas production - Part 3: Verification, qualification and
balloting requirements (ISO/DIS 15156-3:2025)
Öl- und Gasindustrie einschließlich kohlenstoffarmer Energieträger - Werkstoffe für den
Einsatz in H₂S-haltiger Umgebung bei der Öl- und Gasgewinnung - Teil 3:
Anforderungen an Verifizierung, Qualifizierung und Abstimmung (ISO/DIS 15156-3:2025)
Industries du pétrole et du gaz naturel - Matériaux pour utilisation dans des
environnements contenant de l'hydrogène sulfuré (H2S) dans la production de pétrole et
de gaz - Partie 3: Exigences relatives à la vérification, à la qualification et au vote
(ISO/DIS 15156-3:2025)
Ta slovenski standard je istoveten z: prEN ISO 15156-3
ICS:
75.180.01 Oprema za industrijo nafte in Equipment for petroleum and
zemeljskega plina na splošno natural gas industries in
general
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.

DRAFT
International
Standard
ISO/DIS 15156-3
ISO/TC 67
Oil and gas industries including
Secretariat: NEN
lower carbon energy — Materials
Voting begins on:
for use in H2S-containing
2025-12-18
environments in oil and gas
Voting terminates on:
production —
2026-03-12
Part 3:
Verification, qualification and
balloting requirements
ICS: 75.180.01
THIS DOCUMENT IS A DRAFT CIRCULATED
FOR COMMENTS AND APPROVAL. IT
IS THEREFORE SUBJECT TO CHANGE
AND MAY NOT BE REFERRED TO AS AN
INTERNATIONAL STANDARD UNTIL
PUBLISHED AS SUCH.
This document is circulated as received from the committee secretariat.
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Reference number
ISO/DIS 15156-3:2025(en)
DRAFT
ISO/DIS 15156-3:2025(en)
International
Standard
ISO/DIS 15156-3
ISO/TC 67
Oil and gas industries including
Secretariat: NEN
lower carbon energy — Materials
Voting begins on:
for use in H2S-containing
environments in oil and gas
Voting terminates on:
production —
Part 3:
Verification, qualification and
balloting requirements
ICS: 75.180.01
THIS DOCUMENT IS A DRAFT CIRCULATED
FOR COMMENTS AND APPROVAL. IT
IS THEREFORE SUBJECT TO CHANGE
AND MAY NOT BE REFERRED TO AS AN
INTERNATIONAL STANDARD UNTIL
PUBLISHED AS SUCH.
This document is circulated as received from the committee secretariat.
IN ADDITION TO THEIR EVALUATION AS
BEING ACCEPTABLE FOR INDUSTRIAL,
© ISO 2025
TECHNOLOGICAL, COMMERCIAL AND
USER PURPOSES, DRAFT INTERNATIONAL
All rights reserved. Unless otherwise specified, or required in the context of its implementation, no part of this publication may
STANDARDS MAY ON OCCASION HAVE TO
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Website: www.iso.org
Published in Switzerland Reference number
ISO/DIS 15156-3:2025(en)
ii
ISO/DIS 15156-3:2025(en)
Contents Page
Foreword .v
Introduction .vi
1 Scope . 1
2 Normative references . 1
3 Terms and definitions . 2
4 Symbols and abbreviated terms. 3
5 General principles . 5
5.1 General .5
5.2 Limitations and relevant exclusions .6
5.3 Stakeholders .6
5.4 Responsibilities .7
5.4.1 All parties .7
5.4.2 Equipment user or client .7
5.4.3 Manufacturer and supplier of equipment/materials .7
5.4.4 Materials testing laboratory .7
5.5 Damage mechanisms .7
5.6 Prevalent and possible damage mechanisms .8
6 Sampling from materials and products. 9
6.1 General .9
6.1.1 Sampling considerations .9
6.1.2 Sampling for verification.10
6.1.3 Sampling for qualification .10
6.2 Sampling from specific equipment or product .10
7 Test methods .11
7.1 Selection .11
7.1.1 General .11
7.1.2 Standardized methods . 12
7.1.3 Alternative test methods . 15
7.1.4 Testing weldments . 15
7.1.5 Invalid tests . 15
7.2 Test duration .16
7.3 Test stress derivation .16
7.4 Constant load and sustained load test methods .16
7.5 Constant deflection test methods .17
7.5.1 General .17
7.5.2 Total strain derivation .17
7.5.3 Four-point bend .18
7.5.4 C-ring .18
7.5.5 SOHIC testing method .18
7.5.6 Full-ring ovalization test .18
7.6 Other test methods .18
7.6.1 General .18
7.6.2 Fracture mechanics and crack arrest testing .19
7.6.3 Dynamically loaded test methods .19
8 Laboratory H S-testing .20
8.1 General . 20
8.1.1 Overview . 20
8.1.2 Verification testing .21
8.1.3 Qualification testing .21
8.1.4 Ballot testing .21
8.1.5 Characterisation classes for observed damage in verification and qualification .21
8.2 Cast irons . 22

iii
ISO/DIS 15156-3:2025(en)
8.3 Carbon and low alloy steels. 22
8.3.1 General . 22
8.3.2 Sulfide stress cracking (SSC) of carbon and low alloy steels . 23
8.3.3 Hydrogen induced cracking (HIC)/stepwise cracking (SWC) . . 28
8.3.4 Stress-oriented hydrogen induced cracking (SOHIC) . 29
8.4 Corrosion-resistant alloys . 30
8.4.1 General . 30
8.4.2 Sulfide stress cracking (SSC) of CRAs .31
8.4.3 Stress corrosion cracking (SCC) of CRAs . 34
8.4.4 Galvanically-induced hydrogen stress cracking (GHSC) .37
9 Verification .38
9.1 General . 38
9.2 Verification testing for specific materials and products . 39
10 Qualification .39
10.1 General . 39
10.1.1 Overview . 39
10.1.2 Sampling, specimens, and test methods . 40
10.1.3 Acceptance criteria . 40
10.1.4 Retesting . 40
10.2 Qualification testing of materials and products . 40
10.2.1 General . 40
10.2.2 Definition of qualification environment test variables . . 40
10.2.3 Qualification testing of a single batch or product.41
10.2.4 Qualification of manufacturing route . .42
10.3 Qualification of welding procedure or products .43
10.4 Qualification of other processes .43
10.5 Qualification testing for specific materials and products .43
10.6 Qualification by field experience .43
11 Reporting .44
11.1 General . 44
11.2 Reporting of loading of specimens . 44
11.3 Reporting of environmental test variables . 44
11.4 Reporting of observed damage .45
11.5 Reporting of verification and qualification tests .45
11.6 Reporting of qualification by field experience . 46
Annex A (normative) Sampling from specific equipment or product . 47
Annex B (normative) Verification testing of specific materials and products .51
Annex C (normative) Qualification testing of specific materials and products .53
Annex D (normative) Data required to submit ballots to amend the ISO 15156 series .57
Annex E (informative) Data on typical compositions of test environments used for material
verification, qualification and balloting . 67
Annex F (normative) Legacy SOHIC assessment .73
Bibliography . 74

iv
ISO/DIS 15156-3:2025(en)
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 documents 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).
Attention is drawn to the possibility that some of the elements of this document may be the subject of patent
rights. ISO shall not be held responsible for identifying any or all such patent rights. Details of any patent
rights identified during the development of the document will be in the Introduction and/or on the ISO list of
patent declarations received (see www.iso.org/patents).
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, in collaboration with the European Committee for Standardization (CEN) Technical Committee CEN/
TC 12, Oil and gas industries including lower carbon energy, in accordance with the Agreement on technical
cooperation between ISO and CEN (Vienna Agreement).
This fifth edition cancels and replaces the fourth edition (ISO 15156-3:2020), which has been technically
revised. The main changes compared to the previous edition are as follows:
— this is a rewritten and reorganized edition with main changes compared to the previous editions.
— ISO 15156 series consists of the following parts:
— Part 1: Materials and materials processing requirements;
— Part 2: Service environment assessment and material selection;
— Part 3: Verification, qualification and balloting requirements.
— materials sampling has more detail in Clause 6 and Annex A provides information for sampling from
specific equipment or product;
— improved information is provided on test methods and selection in Clause 7;
— laboratory testing has been clarified in respect of verification, qualification and balloting in Clause 8
— separation of verification (in Clause 9 and Annex B), qualification (in Clause 10 and Annex C) and balloting
(in Annex D) with improved clarity on requirements.
A list of all parts in the ISO 15156 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/DIS 15156-3:2025(en)
Introduction
The consequences of sudden failures of metallic oil and gas field equipment, associated with their exposure
to H S-containing production fluids, led to the preparation of the first edition of ANSI/NACE MR0175, which
was published in 1975 by the National Association of Corrosion Engineers, now known as AMPP (Association
for Materials Protection and Performance). Collaboration with the European Federation of Corrosion (EFC)
resulted in the first joint publication of the ISO 15156-series in 2003.
The fifth edition of the ISO 15156 series makes substantive changes to the structure of the standard and is
organized as follows:
— Part 1: Materials and materials processing requirements;
— Part 2: Service environment assessment and material selection;
— Part 3: Verification, qualification, and balloting requirements.
Material specification requirements are given in ISO 15156-1. This includes requirements that are generic to
a material class and those that are specific to a material listed in ISO 15156-2. In some instances, specifically
for those grades whose performance in H S-containing environments is most susceptible to materials
processing variation, ISO 15156-1 also specifies materials processing or qualification requirements for a
listed material.
Acceptable materials selections for a given combination of equipment and service environment are stated
in ISO 15156-2: it lists environmental limits for materials that have been accepted through the development
and maintenance of the ISO 15156 series, and, stipulates the path to acceptance for materials and/or
environmental conditions not listed.
The processes and procedures for verification and qualification by H S-testing (including where required
by ISO 15156-1 and ISO 15156-2) are given in ISO 15156-3. Processes and procedures for balloting new
materials, material conditions, environmental limits, and/or product specifications for incorporation into
the ISO 15156 series are also described in ISO 15156-3. A description of the process by which changes are
approved can be found at the ISO 15156 maintenance website www.iso.org/iso15156maintenance
Conformance with the ISO 15156-series can require conformance with more than one document in the
ISO 15156 series. Paths for conformance with the ISO 15156 series are given in Figure 1

vi
ISO/DIS 15156-3:2025(en)
a
See exclusions in ISO 15156-2:202x, Table 1.
b
There is an option to ballot for inclusion in the ISO 15156 series.
Figure 1 — Application of the ISO 15156 series in determining whether a material is suitable for a
specific environment
The ISO 15156 series were developed and approved by representative groups from within the oil and gas
production industry, following the applicable ISO and ANSI/AMPP rules.
Future changes to the ISO 15156 series may be published as interim updates to this document in the form of
ISO Technical Circulars. Document users should check for applicable ISO Technical Circulars when applying
the ISO 15156 series.
ISO 15156-3 describes the requirements for balloting changes (e.g. new materials, alternative requirements
or alternative limits). Such balloted changes are based upon test data and/or field experience. Other
proposed changes may be submitted for consideration. Details on balloting are provided in Annex D.
The joint ISO 15156 and ANSI/NACE MR0175/ISO 15156 Maintenance Agency at DIN was set up after
approval by the ISO Technical Management Board given in document 34/2007. This document describes the
makeup of the agency, which includes experts from AMPP and ISO/TC 67, and the process for approval of
ISO Technical Circulars. It is available from the ISO 15156 maintenance website and from the ISO/TC 67
Secretariat. The website also provides access to related documents that provide more detail on ISO 15156
series maintenance activities.
In this document, the following verbal forms are used:
— “shall” indicates a requirement;
— “should” indicates a recommendation;

vii
ISO/DIS 15156-3:2025(en)
— “may” indicates a permission;
— “can” indicates a possibility or a capability.

viii
DRAFT International Standard ISO/DIS 15156-3:2025(en)
Oil and gas industries including lower carbon energy —
Materials for use in H2S-containing environments in oil and
gas production —
Part 3:
Verification, qualification and balloting requirements
WARNING — The laboratory tests specified in this document address cracking in the presence of H S
only. It is the equipment user’s responsibility to ensure that appropriate testing is undertaken for
any other applicable H S-related damage mechanisms.
1 Scope
This document specifies requirements and gives recommendations for the verification, qualification
and balloting requirements of metallic materials for service in equipment used in oil and gas production
in H S-containing environments, where the failure can pose a risk to the health and safety of the public
and personnel or to the environment. The requirements supplement but do not replace the verification (or
qualification) requirements given in the appropriate design codes, standards, specifications or regulations.
This document addresses the verification, qualification and balloting requirements of materials for
equipment designed and constructed using load-controlled design methods, see 5.2. For design and
applications utilizing strain-based design methods, see 5.2 and 7.6.3.3.
This document addresses damage mechanisms in production environments caused by H S, including sulfide
stress cracking, stress corrosion cracking, hydrogen-induced cracking and stepwise cracking, stress-
oriented hydrogen-induced cracking, soft zone cracking, and galvanically-induced hydrogen stress cracking.
This document is not intended for equipment used in carbon capture, utilisation and/or storage (CCUS, CCS)
refining or downstream processes and equipment (see ISO 17945/NACE MR0103) but the guidance and
principles can be applied by the equipment user for these applications.
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 3845, Oil and gas industries including lower carbon energy — Full ring ovalization test method for the
evaluation of the cracking resistance of steel line pipe in sour service
ISO 6892-1, Metallic materials — Tensile testing — Part 1: Method of test at room temperature
ISO 6892-2, Metallic materials — Tensile testing — Part 2: Method of test at elevated temperature
ISO 11960, Petroleum and natural gas industries — Steel pipes for use as casing or tubing for wells
ISO 15156-1:202x, Oil and gas industries including lower carbon energy — Materials for use in H S-containing
environments in oil and gas production — Part 1: Materials and materials processing requirements
ISO 15156-2:202x, Oil and gas industries including lower carbon energy — Materials for use in H S-containing
environments in oil and gas production — Part 2: Service environment assessment and material selection

ISO/DIS 15156-3:2025(en)
ISO 17782, Petroleum, petrochemical and natural gas industries — Scheme for conformity assessment of
manufacturers of special materials
1)
AMPP TM21451, Evaluation of Carbon and Low-Alloy Steels for Resistance to Stress-Oriented Hydrogen-
Induced Cracking (SOHIC)
2)
AMPP TM21452, Ripple Load Test Method for Evaluation of Environmentally Assisted Cracking Resistance of
Corrosion-Resistant Alloys
3)
API 5CT , Casing and Tubing
4)
ASTM E8 , Standard Test Methods for Tension Testing of Metallic Materials
ASTM E21, Standard Test Methods for Elevated Temperature Tension Tests of Metallic Materials
ASTM A370, Standard Test Methods and Definitions for Mechanical Testing of Steel Products
NACE TM0177:2024 , Laboratory testing of metals for resistance to sulfide stress cracking and stress corrosion
cracking in H S environments
NACE TM0198:2020, Slow Strain Rate Test Method for Screening Corrosion-Resistant Alloys for Stress Corrosion
Cracking in Sour Oilfield Service
NACE TM0284:2016, Evaluation of Pipeline and Pressure Vessel Steels for Resistance to Hydrogen-Induced
Cracking
NACE TM0316:2023, Four-Point Bend Testing of Materials for Oil and Gas Applications
5)
NORSOK M-650 , Qualification of manufacturers of special materials
3 Terms and definitions
For the purposes of this document, the terms and definitions given in ISO 15156-1 and ISO 15156-2 and the
following apply.
ISO and IEC maintain terminological 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
balloting
process to seek changes to the ISO 15156 series via peer review of submitted data
1) www .ampp .org
2) Under preparation
3) www .api .org
4) www .astm .org
5) www .standard .no
ISO/DIS 15156-3:2025(en)
3.2
batch
heat lot
discrete quantity of a finished product verified using the same set of material property quality control
test data, manufactured from, as a minimum, the same heat, the same manufacturing route and the same
parameters to the same dimensions
Note 1 to entry: Where the product specification defines a heat-lot, this is a batch per the ISO 15156 series. For example,
a batch of pipe to the product specification API 5CT is traceable to a combination of heat (i.e. primary melt) and lot (i.e.
pipe lengths from the same heat that are considered uniform and to have essentially identical material properties,
such that material property testing of a small number of lengths is representative of all lengths in the lot).
Note 2 to entry: Balloting and qualification can require multiple batches from different sizes and covering the range of
chemical composition and properties representative of the material production.
Note 3 to entry: When assessing weldments, the term batch can be considered as one to address weldments in the same
heats and within the limits of the agreed welding procedure essential variables covered by the same weld procedure
specification (WPS) in support of the weld procedure qualification (WPQ).
3.3
client
user, material/equipment supplier or other party contracting laboratory H S-testing
3.4
isotropic
having the same physical properties in all directions
3.5
sample
sampling
selected portion of material extracted from the product batch subject to testing
3.6
specimen
material section removed from the sample material, finished to required dimensions, surface condition etc.
in accordance with the appropriate test method standard and/or client requirements
3.7
stress-assisted corrosion
selective corrosion attack triggered by, and oriented normal to, the principal applied stress
Note 1 to entry: An example approach for identification of stress-assisted corrosion in comparison with other localized
corrosion and cracking features can be found in Reference [46].
4 Symbols and abbreviated terms
AM additive manufacturing
AYS actual yield strength
CCS carbon capture and storage
CCUS carbon capture, utilisation and storage
CD constant deflection
CL constant load
CR C-ring
CRA corrosion-resistant alloy
ISO/DIS 15156-3:2025(en)
CT compact tension
DCB double cantilever beam (test)
EOS equation of state
FM fracture mechanics
FPB Four-point bend (test)
GHSC galvanically induced hydrogen stress cracking
HAZ heat-affected zone
HIC hydrogen-induced cracking
HIPed hot isostatically pressed
LHZ local hard zones
MPCR manufacturing procedure conformity record
MTR material test report
NDT non-destructive testing
OCTG oil country tubular goods, i.e. casing, tubing and drill pipe
PWC preferential weldment corrosion
PWHT post-weld heat treatment
p partial pressure of CO
CO2 2
p partial pressure of H S
H2S 2
QTR qualification test record
RLT ripple load test
SCC stress corrosion cracking
SENT single-edge notched tension
SENB single-edge notched beam
SL sustained load
SMYS specified minimum yield strength
SOHIC stress-oriented hydrogen-induced cracking
SSC sulfide stress-cracking
SSR slow strain rate
SSRT slow strain rate test
SWC stepwise cracking
SZC soft-zone cracking
ISO/DIS 15156-3:2025(en)
TMCP thermo-mechanically controlled process
UT uniaxial tensile (test)
WPQ weld procedure qualification
WPS weld procedure specification
5 General principles
5.1 General
This document provides guidance in the testing of materials in relation to the determination of resistance to
damage mechanisms induced by H S in oil and gas production environments.
Testing and reporting of results shall conform to the relevant test standard or material or product
specification supplemented with the additional requirements presented in this document.
For the purposes of this document, API 5CT, API 5CRA and API 5L are deemed equivalent to ISO 11960,
ISO 13680 and ISO 3183 respectively.
Where there is a conflict between this document and referenced test method documents, this document
shall take precedence. Additional requirements may be stipulated by the client. Alternative requirements
may be stipulated by the equipment user.
Re-qualifications and new qualifications initiated after the publication of the ISO 15156:202x series shall
be in accordance with this document. ISO 15156 series qualifications to previous editions of the ISO 15156
series, completed and reported no later than 12 months after publication of the ISO 15156:202x series may
still be used.
Neither ISO nor AMPP maintain a program for certification/accreditation of H S service qualification
in conformance with this document. Manufacturers claiming that H S service qualifications are in
conformance with this document shall be responsible for understanding and implementing the relevant
clauses of this document. Such conformance may be stated as “[Company name] asserts conformance with
ISO 15156-3:202x and ANSI/NACE MR0175/ISO 15156-3:202x for [defined parameters]”. In this context
[defined parameters] includes the qualified conditions for pH , pH and chloride content and any restrictions
2S
on temperature and stress, as applicable.
NOTE Claims of AMPP Certified, ISO Certified or similar phrases implying certification or accreditation of
materials, equipment or processing are misleading since neither AMPP nor ISO offer such certification or accreditation
processes to ISO 15156 series and ANSI/NACE MR0175/ISO 15156.
This document is structured as follows showing the intended logic sequence of steps to implement its clauses
and their inter-relationships.
The main supporting general clauses are:
a) damage mechanisms addressed in this document (see 5.5);
b) sampling materials and products (see Clause 6 and Annex A);
c) test methods (see Clause 7);
d) laboratory H S-testing (see Clause 8);
e) reporting (see Clause 11).
ISO/DIS 15156-3:2025(en)
The clauses specific for the purposes of testing are as follows, with flowcharts for the implementation of the
relevant H S-testing and their relationship with ISO 15156-1 and ISO 15156-2 provided within each of these
clauses:
f) testing for verification (see Clause 9 and Annex B);
g) H S-testing for qualification (see Clause 10 and Annex C);
h) H S-testing for balloting (see Annex D).
Annex D also provides information related to guidance for balloting changes to the standard based upon
field experience or other changes to the standard.
5.2 Limitations and relevant exclusions
The following limitations apply:
a) This document is concerned only with testing resistance to damage mechanisms addressed in 5.5. Loss
of material by general (mass loss) or localized corrosion, or cracking mechanisms in the absence of H S,
are not addressed.
NOTE Mechanical and other quality assurance test types are commented upon with regards to verification
as they pertain to confirmation of material resistance to damage mechanisms (see 8.1.2 and Clause 9).
b) The limits given in ISO 15156-2 are for production environments. Additional testing, e.g. chemical
compatibility studies, is often stipulated to address non-production environments such as chemical
injection and acid flowback.
c) This document applies to H S-testing requirements for materials for equipment designed and
constructed using load-controlled design methods. For designs utilizing strain-based design methods,
use of this document might not be appropriate and other test methods might be required, see 7.6.3.3.
d) No guidance is given on H S-testing to assess for synergies between the cracking mechanisms in this
document and other damage mechanisms, such as fatigue. Prescence of H S can adversely impact fatigue
resistance properties for conditions defined as safe for static load-based design.
e) The carbon steel, low alloy steels and cast irons listed in ISO 15156-1 have typically been qualified
for SSC based upon performance at ambient temperature, nominally (24 ±
...