Gas pressure safety and control devices for use in gas transmission, distribution and installations for inlet pressures up to and including 10 MPa — Part 1: General requirements

This document specifies generic safety, constructional, performance, testing and documentation requirements for high pressure controls for use in gas transmission, distribution and installations (hereafter referred to as controls). This document is applicable to controls with operating pressures greater than 500 kPa (5 bar) and up to and including 10 MPa (100 bar) and nominal size up to DN 400 for use with fuel gases as natural gas, manufactured gas, biomethane or liquefied petroleum gas (LPG) in commercial, industrial installations, including fuel gas infrastructures. The test methods given in this document are intended for product type test, routine tests and batch surveillance tests. This document is not applicable to: — controls upstream from/on/in domestic gas-consuming appliances which are installed downstream of domestic gas meters; — controls designed with declared maximum capacity ≤200 m3/h (normal conditions) and declared maximum inlet pressure ≤500 kPa (5 bar), to be incorporated into pressure control systems used in service lines (pipework from the main pipework in a gas infrastructure to the point of delivery of the gas); — industrial process control valves, such as IEC 60534; — controls used in aggressive/sour gas environments (gas environments containing water and H2S are considered sour) or severely corrosive conditions; — controls in service conditions with renewables (e.g. H2NG with hydrogen more than 10 %) and/or waste gases (e.g. biogas, etc.), if additional information is not provided (e.g. contaminant, liquid, etc.).

Titre manque — Partie 1: Titre manque

General Information

Status
Published
Publication Date
10-Jan-2022
Current Stage
6060 - International Standard published
Start Date
11-Jan-2022
Due Date
14-Dec-2020
Completion Date
11-Jan-2022
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INTERNATIONAL ISO
STANDARD 23555-1
First edition
2022-01
Gas pressure safety and control
devices for use in gas transmission,
distribution and installations for
inlet pressures up to and including 10
MPa —
Part 1:
General requirements
Reference number
ISO 23555-1:2022(E)
© ISO 2022

---------------------- Page: 1 ----------------------
ISO 23555-1:2022(E)
COPYRIGHT PROTECTED DOCUMENT
© ISO 2022
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: +41 22 749 01 11
Email: copyright@iso.org
Website: www.iso.org
Published in Switzerland
ii
  © ISO 2022 – All rights reserved

---------------------- Page: 2 ----------------------
ISO 23555-1:2022(E)
Contents Page
Foreword . vi
Introduction .vii
1 Scope . 1
2 Normative references . 1
3 Terms, definitions, symbols and abbreviated terms . 3
3.1 Terms and definitions . 3
3.1.1 General terms . 3
3.1.2 Terms related to components . 5
3.1.3 Terms related to components of functional performance. 6
3.1.4 Terms related to design and tests . 8
3.2 Symbols and abbreviated terms . 9
4 Classification .10
4.1 General . 10
4.2 Temperature classes . 10
4.3 Strength types . 11
5 Materials .11
5.1 General . 11
5.2 Requirements . 11
5.2.1 Requirements for metallic materials . 11
5.2.2 Requirements for non-metallic materials . 13
5.3 Validation and test of materials .13
5.3.1 Material inspection documents of metallic pressure-containing parts and
inner metallic partition walls . 13
5.3.2 Material inspection documents of threaded sealing plugs, integral process
and sensing lines, connectors and metallic fasteners . 14
5.3.3 Material inspection documents of non-metallic functional parts. 14
5.3.4 Non-destructive testing for steel bodies . 14
6 Design .14
6.1 General . 14
6.1.1 Design approach . 14
6.1.2 Basic requirements . 15
6.1.3 Hazard identification and residual risks . 15
6.1.4 End connections . 15
6.1.5 Flange ratings . 16
6.1.6 Nominal sizes and face-to-face dimensions . 16
6.1.7 Sealing of the adjusting device . 18
6.1.8 Replaceable parts that can be affected by erosion or abrasion . 18
6.1.9 Integral strength pressure controls . 18
6.1.10 Differential strength pressure controls . 18
6.1.11 Metallic flanges . 18
6.1.12 Minimum values of safety factor . 19
6.1.13 Springs requirements . 19
6.2 Strength of metallic body and its inner metallic partition walls . 19
6.2.1 General . 19
6.2.2 Requirements . 19
6.2.3 Design strength verification for metallic body and its inner metallic
partition walls . 20
6.3 Other pressure-containing metallic parts of integral and differential strength
controls. 22
6.3.1 General .22
6.3.2 Requirements . 22
iii
© ISO 2022 – All rights reserved

---------------------- Page: 3 ----------------------
ISO 23555-1:2022(E)
6.3.3 Design strength verification for other pressure-containing parts of
integral and differential strength controls . 23
6.4 Strength of parts transmitting actuating forces . 24
6.4.1 General . 24
6.4.2 Requirements . 24
6.4.3 Design strength verification for parts transmitting actuating forces . 24
6.5 Strength of diaphragms (elastomeric parts) . 24
6.5.1 General . 24
6.5.2 Requirements . 24
6.5.3 Design strength verification for diaphragms (elastomeric parts) . 24
6.6 Welding . . 25
6.6.1 General . 25
6.6.2 Requirements . 25
6.6.3 Non-destructive testing of fabrication welds . 25
7 Performance and testing requirements .27
7.1 General . 27
7.1.1 Approach to stable production phase . 27
7.1.2 Test conditions . 27
7.1.3 Test tolerances . . . 27
7.1.4 Overview table .28
7.2 Requirements .29
7.2.1 Test rig .29
7.2.2 Classification of stable production tests . 32
7.2.3 Dimensional check and visual inspection . 32
7.2.4 Shell strength . 32
7.2.5 External/Internal tightness . 33
7.2.6 Antistatic characteristics . 33
7.2.7 Sound emission . 33
7.2.8 Resistance of external surfaces to corrosion .34
7.3 Tests .34
7.3.1 Materials check at stable production phase.34
7.3.2 Dimensional check and visual inspection .34
7.3.3 Mounting position . 35
7.3.4 Shell strength . 35
7.3.5 External tightness .36
7.3.6 Internal tightness . 37
7.3.7 Antistatic characteristics . 37
7.3.8 Methods for calculating and measuring the sound pressure level . 37
7.3.9 Method for testing of resistance of external surfaces to corrosion .39
8 Documentation .40
8.1 General .40
8.2 Documentation related to type test.40
8.2.1 Documentation required prior to type test .40
8.2.2 Type test report .40
8.3 Documentation related to batch surveillance .40
8.3.1 Documentation to be available for batch surveillance .40
8.3.2 Batch surveillance report . 41
8.4 Documentation related to the routine tests . 41
8.4.1 Documentation provided at the request of the customer . 41
8.4.2 Documentation provided with the control . 41
9 Marking . .41
9.1 General . 41
9.2 Basic requirements . 42
9.3 Markings for the various connections . 42
9.4 Marking of integrated safety devices . 42
10 Packaging and transportation of finished product .42
iv
  © ISO 2022 – All rights reserved

---------------------- Page: 4 ----------------------
ISO 23555-1:2022(E)
10.1 General . 42
10.2 Requirements . 43
10.3 Test . 43
Annex A (informative) List of materials . 44
Annex B (normative) Elastomeric material .60
Annex C (normative) Vent limiter .62
Annex D (normative) Compliance evaluation .66
Annex E (informative) Specific regional requirements in Japan .68
Bibliography .69
v
© ISO 2022 – All rights reserved

---------------------- Page: 5 ----------------------
ISO 23555-1:2022(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 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 161, Controls and protective devices for
gas and/or oil.
A list of all parts in the ISO 23555 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.
vi
  © ISO 2022 – All rights reserved

---------------------- Page: 6 ----------------------
ISO 23555-1:2022(E)
Introduction
This document provides general requirements for controls and protective devices and is intended to
be used in conjunction with ISO 23555-2 and ISO 23555-3 for specific types of controls and protective
devices or for controls for specific applications.
This document can also be applied, so far as reasonable, to controls not mentioned in a specific standard
and to controls designed on new principles, in which case additional requirements can be necessary.
When no specific International Standard for a control exists, the control can be tested according to this
document and further tests which take into account the intended use.
Controls and safety devices used with gases need to withstand the type of gas which is specified. Other
ISO Technical Committees, such as ISO/TC 28, Petroleum products and lubricants, and ISO/TC 193,
Natural gas, deal with the testing and properties of fuel gases.
Note that due to the differing properties of gas depending on its source/region of origin, certain
differences in regulations exist at present in different regions, some of which are presented in Annex E.
This document intends to provide a basic framework of requirements until these differences can be
harmonized.
vii
© ISO 2022 – All rights reserved

---------------------- Page: 7 ----------------------
INTERNATIONAL STANDARD ISO 23555-1:2022(E)
Gas pressure safety and control devices for use in gas
transmission, distribution and installations for inlet
pressures up to and including 10 MPa —
Part 1:
General requirements
1 Scope
This document specifies generic safety, constructional, performance, testing and documentation
requirements for high pressure controls for use in gas transmission, distribution and installations
(hereafter referred to as controls).
This document is applicable to controls with operating pressures greater than 500 kPa (5 bar) and up
to and including 10 MPa (100 bar) and nominal size up to DN 400 for use with fuel gases as natural gas,
manufactured gas, biomethane or liquefied petroleum gas (LPG) in commercial, industrial installations,
including fuel gas infrastructures.
The test methods given in this document are intended for product type test, routine tests and batch
surveillance tests.
This document is not applicable to:
— controls upstream from/on/in domestic gas-consuming appliances which are installed downstream
of domestic gas meters;
3
— controls designed with declared maximum capacity ≤200 m /h (normal conditions) and declared
maximum inlet pressure ≤500 kPa (5 bar), to be incorporated into pressure control systems used
in service lines (pipework from the main pipework in a gas infrastructure to the point of delivery of
the gas);
— industrial process control valves, such as IEC 60534;
— controls used in aggressive/sour gas environments (gas environments containing water and H S
2
are considered sour) or severely corrosive conditions;
— controls in service conditions with renewables (e.g. H NG with hydrogen more than 10 %) and/or
2
waste gases (e.g. biogas, etc.), if additional information is not provided (e.g. contaminant, liquid,
etc.).
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 amendments) applies.
ISO 148-1, Metallic materials — Charpy pendulum impact test — Part 1: Test method
ISO 175, Plastics — Methods of test for the determination of the effects of immersion in liquid chemicals
ISO 1817, Rubber, vulcanized – Determination of the effect of liquids
ISO 3419, Non-alloy and alloy steel butt-welding fittings
1
© ISO 2022 – All rights reserved

---------------------- Page: 8 ----------------------
ISO 23555-1:2022(E)
ISO 7005 (all parts),Pipe flanges
ISO 9606-1, Qualification testing of welders — Fusion welding — Part 1: Steels
ISO 9606-2, Qualification test of welders — Fusion welding — Part 2: Aluminium and aluminium alloys
ISO 9606-3, Approval testing of welders — Fusion welding — Part 3: Copper and copper alloys
ISO 9606-4, Approval testing of welders — Fusion welding — Part 4: Nickel and nickel alloys
ISO 9712, Non-destructive testing — Qualification and certification of NDT personnel
ISO 10474:2013, Steel and steel products — Inspection documents
ISO 14732, Welding personnel — Qualification testing of welding operators and weld setters for mechanized
and automatic welding of metallic materials
ISO 15607, Specification and qualification of welding procedures for metallic materials — General rules
ISO 15609-1, Specification and qualification of welding procedures for metallic materials — Welding
procedure specification — Part 1: Arc welding
ISO 15610, Specification and qualification of welding procedures for metallic materials — Qualification
based on tested welding consumables
ISO 15611, Specification and qualification of welding procedures for metallic materials — Qualification
based on previous welding experience
ISO 15612, Specification and qualification of welding procedures for metallic materials — Qualification by
adoption of a standard welding procedure specification
ISO 15613, Specification and qualification of welding procedures for metallic materials — Qualification
based on pre-production welding test
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 15614-2, Specification and qualification of welding procedures for metallic materials — Welding
procedure test — Part 2: Arc welding of aluminium and its alloys
ISO 17637, Non-destructive testing of welds — Visual testing of fusion-welded joints
ISO/IEC 17025:2017, General requirements for the competence of testing and calibration laboratories
IEC 6
...

FINAL
INTERNATIONAL ISO/FDIS
DRAFT
STANDARD 23555-1
ISO/TC 161
Gas pressure safety and control
Secretariat: DIN
devices for use in gas transmission,
Voting begins on:
2021-10-01 distribution and installations for
inlet pressures up to and including 10
Voting terminates on:
2021-11-26
MPa —
Part 1:
General requirements
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 SUPPOR TING
DOCUMENTATION.
IN ADDITION TO THEIR EVALUATION AS
Reference number
BEING ACCEPTABLE FOR INDUSTRIAL, TECHNO-
ISO/FDIS 23555-1:2021(E)
LOGICAL, COMMERCIAL AND USER PURPOSES,
DRAFT INTERNATIONAL STANDARDS MAY ON
OCCASION HAVE TO BE CONSIDERED IN THE
LIGHT OF THEIR POTENTIAL TO BECOME STAN-
DARDS TO WHICH REFERENCE MAY BE MADE IN
NATIONAL REGULATIONS. © ISO 2021

---------------------- Page: 1 ----------------------
ISO/FDIS 23555-1:2021(E)
COPYRIGHT PROTECTED DOCUMENT
© ISO 2021
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: +41 22 749 01 11
Email: copyright@iso.org
Website: www.iso.org
Published in Switzerland
ii
  © ISO 2021 – All rights reserved

---------------------- Page: 2 ----------------------
ISO/FDIS 23555-1:2021(E)
Contents Page
Foreword . vi
Introduction .vii
1 Scope . 1
2 Normative references . 1
3 Terms, definitions, symbols and abbreviated terms . 3
3.1 Terms and definitions . 3
3.1.1 General terms . 3
3.1.2 Terms related to components . 5
3.1.3 Terms related to components of functional performance. 6
3.1.4 Terms related to design and tests . 8
3.2 Symbols and abbreviated terms . 9
4 Classification .10
4.1 General . 10
4.2 Temperature classes . 10
4.3 Strength types . 11
5 Materials .11
5.1 General . 11
5.2 Requirements . 11
5.2.1 Requirements for metallic materials . 11
5.2.2 Requirements for non-metallic materials . 13
5.3 Validation and test of materials .13
5.3.1 Material inspection documents of metallic pressure-containing parts and
inner metallic partition walls . 13
5.3.2 Material inspection documents of threaded sealing plugs, integral process
and sensing lines, connectors and metallic fasteners . 14
5.3.3 Material inspection documents of non-metallic functional parts. 14
5.3.4 Non-destructive testing for steel bodies . 14
6 Design .14
6.1 General . 14
6.1.1 Design approach . 14
6.1.2 Basic requirements . 15
6.1.3 Hazard identification and residual risks . 15
6.1.4 End connections . 15
6.1.5 Flange ratings . 16
6.1.6 Nominal sizes and face-to-face dimensions . 16
6.1.7 Sealing of the adjusting device . 18
6.1.8 Replaceable parts that can be affected by erosion or abrasion . 18
6.1.9 Integral strength pressure controls . 19
6.1.10 Differential strength pressure controls . 19
6.1.11 Metallic flanges . 19
6.1.12 Minimum values of safety factor . 19
6.1.13 Springs requirements . 19
6.2 Strength of metallic body and its inner metallic partition walls . 20
6.2.1 General .20
6.2.2 Requirements . 20
6.2.3 Design strength verification for metallic body and its inner metallic
partition walls . 20
6.3 Other pressure-containing metallic parts of integral and differential strength
controls. 22
6.3.1 General .22
6.3.2 Requirements . 22
iii
© ISO 2021 – All rights reserved

---------------------- Page: 3 ----------------------
ISO/FDIS 23555-1:2021(E)
6.3.3 Design strength verification for other pressure-containing parts of
integral and differential strength controls . 23
6.4 Strength of parts transmitting actuating forces . 24
6.4.1 General . 24
6.4.2 Requirements . 24
6.4.3 Design strength verification for parts transmitting actuating forces . 24
6.5 Strength of diaphragms (elastomeric parts) . 24
6.5.1 General . 24
6.5.2 Requirements . 24
6.5.3 Design strength verification for diaphragms (elastomeric parts) . 24
6.6 Welding . . 25
6.6.1 General . 25
6.6.2 Requirements . 25
6.6.3 Non-destructive testing of fabrication welds . 25
7 Performance and testing requirements .27
7.1 General . 27
7.1.1 Approach to stable production phase . 27
7.1.2 Test conditions . 27
7.1.3 Test tolerances . . . 27
7.1.4 Overview table .28
7.2 Requirements .29
7.2.1 Test rig .29
7.2.2 Classification of stable production tests . 32
7.2.3 Dimensional check and visual inspection . 32
7.2.4 Shell strength . 32
7.2.5 External/Internal tightness . 33
7.2.6 Antistatic characteristics . 33
7.2.7 Sound emission . 33
7.2.8 Resistance of external surfaces to corrosion .34
7.3 Tests .34
7.3.1 Materials check at stable production phase.34
7.3.2 Dimensional check and visual inspection .34
7.3.3 Mounting position . 35
7.3.4 Shell strength . 35
7.3.5 External tightness .36
7.3.6 Internal tightness . 37
7.3.7 Antistatic characteristics . 37
7.3.8 Methods for calculating and measuring the sound pressure level . 37
7.3.9 Method for testing of resistance of external surfaces to corrosion .39
8 Documentation .40
8.1 General .40
8.2 Documentation related to type test.40
8.2.1 Documentation required prior to type test .40
8.2.2 Type test report .40
8.3 Documentation related to batch surveillance .40
8.3.1 Documentation to be available for batch surveillance .40
8.3.2 Batch surveillance report . 41
8.4 Documentation related to the routine tests . 41
8.4.1 Documentation provided at the request of the customer . 41
8.4.2 Documentation provided with the control . 41
9 Marking . .41
9.1 General . 41
9.2 Basic requirements . 42
9.3 Markings for the various connections . 42
9.4 Marking of integrated safety devices . 42
10 Packaging and transportation of finished product .42
iv
  © ISO 2021 – All rights reserved

---------------------- Page: 4 ----------------------
ISO/FDIS 23555-1:2021(E)
10.1 General . 42
10.2 Requirements . 43
10.3 Test . 43
Annex A (informative) List of materials . 44
Annex B (normative) Elastomeric material .60
Annex C (normative) Vent limiter .62
Annex D (normative) Compliance evaluation .66
Annex E (informative) Specific regional requirements in Japan .68
Bibliography .69
v
© ISO 2021 – All rights reserved

---------------------- Page: 5 ----------------------
ISO/FDIS 23555-1:2021(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 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 161, Controls and protective devices for
gas and/or oil.
A list of all parts in the ISO 23555 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.
vi
  © ISO 2021 – All rights reserved

---------------------- Page: 6 ----------------------
ISO/FDIS 23555-1:2021(E)
Introduction
This document provides general requirements for controls and protective devices and is intended to
be used in conjunction with ISO 23555-2 and ISO 23555-3 for specific types of controls and protective
devices or for controls for specific applications.
This document can also be applied, so far as reasonable, to controls not mentioned in a specific standard
and to controls designed on new principles, in which case additional requirements can be necessary.
When no specific International Standard for a control exists, the control can be tested according to this
document and further tests which take into account the intended use.
Controls and safety devices used with gases need to withstand the type of gas which is specified. Other
ISO Technical Committees, such as ISO/TC 28, Petroleum products and lubricants, and ISO/TC 193,
Natural gas, deal with the testing and properties of fuel gases.
Note that due to the differing properties of gas depending on its source/region of origin, certain
differences in regulations exist at present in different regions, some of which are presented in Annex E.
This document intends to provide a basic framework of requirements until these differences can be
harmonized.
vii
© ISO 2021 – All rights reserved

---------------------- Page: 7 ----------------------
FINAL DRAFT INTERNATIONAL STANDARD ISO/FDIS 23555-1:2021(E)
Gas pressure safety and control devices for use in gas
transmission, distribution and installations for inlet
pressures up to and including 10 MPa —
Part 1:
General requirements
1 Scope
This document specifies generic safety, constructional, performance, testing and documentation
requirements for high pressure controls for use in gas transmission, distribution and installations
(hereafter referred to as controls).
This document is applicable to controls with operating pressures greater than 500 kPa (5 bar) and up
to and including 10 MPa (100 bar) and nominal size up to DN 400 for use with fuel gases as natural gas,
manufactured gas, biomethane or liquefied petroleum gas (LPG) in commercial, industrial installations,
including fuel gas infrastructures.
The test methods given in this document are intended for product type test, routine tests and batch
surveillance tests.
This document is not applicable to:
— controls upstream from/on/in domestic gas-consuming appliances which are installed downstream
of domestic gas meters;
3
— controls designed with declared maximum capacity ≤200 m /h (normal conditions) and declared
maximum inlet pressure ≤500 kPa (5 bar), to be incorporated into pressure control systems used
in service lines (pipework from the main pipework in a gas infrastructure to the point of delivery of
the gas);
— industrial process control valves, such as IEC 60534;
— controls used in aggressive/sour gas environments (gas environments containing water and H S
2
are considered sour) or severely corrosive conditions;
— controls in service conditions with renewables (e.g. H NG with hydrogen more than 10 %) and/or
2
waste gases (e.g. biogas, etc.), if additional information is not provided (e.g. contaminant, liquid,
etc.).
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 amendments) applies.
ISO 148-1, Metallic materials — Charpy pendulum impact test — Part 1: Test method
ISO 175, Plastics — Methods of test for the determination of the effects of immersion in liquid chemicals
ISO 1817, Rubber, vulcanized – Determination of the effect of liquids
ISO 3419, Non-alloy and alloy steel butt-welding fittings
1
© ISO 2021 – All rights reserved

---------------------- Page: 8 ----------------------
ISO/FDIS 23555-1:2021(E)
ISO 7005 (all parts),Pipe flanges
ISO 9606-1, Qualification testing of welders — Fusion welding — Part 1: Steels
ISO 9606-2, Qualification test of welders — Fusion welding — Part 2: Aluminium and aluminium alloys
ISO 9606-3, Approval testing of welders — Fusion welding — Part 3: Copper and copper alloys
ISO 9606-4, Approval testing of welders — Fusion welding — Part 4: Nickel and nickel alloys
ISO 9712, Non-destructive testing — Qualification and certification of NDT personnel
ISO 10474:2013, Steel and steel products — Inspection documents
ISO 14732, Welding personnel — Qualification testing of welding operators and weld setters for mechanized
and automatic welding of metallic materials
ISO 15607, Specification and qualification of welding procedures for metallic materials — General rules
ISO 15609-1, Specification and qualification of welding procedures for metallic materials — Welding
procedure specification — Part 1: Arc welding
ISO 15610, Specification and qualification of welding procedures for metallic materials — Qualification
based on tested welding consumables
ISO 15611, Specification and qualification of welding procedures for metallic materials — Qualification
based on previous welding experience
ISO 15612, Specification and qualification of welding procedures for metallic materials — Qualification by
adoption of a standard welding procedure specification
ISO 15613, Specification and qualification of welding procedures for metal
...

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