Safety and control devices for gas and/or oil burners and appliances — General requirements

ISO 23550:2018 specifies safety, construction, performance and testing requirements for controls for gas burners and gas burning appliances for use with natural gas, manufactured gas or liquefied petroleum gas (LPG). ISO 23550:2018 applies to controls for use at maximum operating pressures up to and including 500 kPa. This document provides the general requirements that are intended to be the basis for the specific control standards found in the ISO 23551 and ISO 23552 series. These include the following: - automatic and semi-automatic gas valves; - gas thermoelectric flame supervision controls; - gas and oil /air ratio controls; - gas pressure regulators; - manual gas valves; - mechanical gas thermostats; - multifunctional gas controls; - air and gas pressure-sensing devices; - gas vent valves; - gas valve-proving systems. ISO 23550:2018 covers type testing only. ISO 23550:2018 is also applicable to Gas Quick Connectors (GQC) for use inside appliances with connections up to, and including DN 25, and a maximum operating pressure up to and including 100 kPa. GQCs include: - tube to tube connections; - tube to control connections; and - tube to fitting connections. ISO 23550:2018 does not apply to mechanical controls for use with liquid fuels. It is also not applicable to corrosive and waste gases.

Dispositifs de commande et de sécurité pour brûleurs à gaz et appareils à gaz — Exigences générales

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Status
Published
Publication Date
19-Apr-2018
Current Stage
9060 - Close of review
Start Date
02-Dec-2028
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INTERNATIONAL ISO
STANDARD 23550
Third edition
2018-04
Safety and control devices for gas
and/or oil burners and appliances —
General requirements
Dispositifs de commande et de sécurité pour brûleurs à gaz et
appareils à gaz — Exigences générales
Reference number
ISO 23550:2018(E)
©
ISO 2018

---------------------- Page: 1 ----------------------
ISO 23550:2018(E)

COPYRIGHT PROTECTED DOCUMENT
© ISO 2018
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
Fax: +41 22 749 09 47
Email: copyright@iso.org
Website: www.iso.org
Published in Switzerland
ii © ISO 2018 – All rights reserved

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ISO 23550:2018(E)

Contents Page
Foreword .vi
Introduction .vii
1 Scope . 1
2 Normative references . 1
3 Terms and definitions . 2
4 Classification . 5
4.1 Classes of control . 5
4.2 Groups of controls . 5
4.3 Types of DC supplied controls . 5
4.4 Classes of control functions . 5
5 Test conditions and tolerances . 6
5.1 Test conditions . 6
5.2 Tolerances . 6
6 Construction . 7
6.1 General . 7
6.2 Construction requirements . 7
6.2.1 Appearance . 7
6.2.2 Holes . 7
6.2.3 Breather holes . 8
6.2.4 Vent limiter . 8
6.2.5 Screwed fastenings . 9
6.2.6 Moving parts . 9
6.2.7 Sealing caps . 9
6.2.8 Disassembling and assembling for servicing and/or adjustment for controls .10
6.2.9 Auxiliary channels and orifices .10
6.2.10 Pre-setting device .10
6.3 Materials .11
6.3.1 General material requirements .11
6.3.2 Housing .11
6.3.3 Springs providing closing force and sealing force .12
6.3.4 Resistance to corrosion and surface protection .12
6.3.5 Impregnation .12
6.3.6 Seals for glands for moving parts .13
6.3.7 Jointing .13
6.4 Connections .13
6.4.1 General.13
6.4.2 Connection sizes .13
6.4.3 Connection types .14
6.4.4 Threads .15
6.4.5 Union joints .16
6.4.6 Flanges .16
6.4.7 Compression fittings . . .16
6.4.8 Flare connections .17
6.4.9 Nipples for pressure tests .17
6.4.10 Strainers .17
6.4.11 Gas connections by GQC .18
6.5 Gas controls employing with electrical components in the gas way .18
6.5.1 General.18
6.5.2 Requirements .18
6.5.3 Ignition trial test .18
6.5.4 Test of ignition source .19
7 Performance .20
© ISO 2018 – All rights reserved iii

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ISO 23550:2018(E)

7.1 General .20
7.2 Leak-tightness.21
7.2.1 General.21
7.2.2 Requirements .21
7.2.3 Test .21
7.3 Torsion and bending .24
7.3.1 General.24
7.3.2 Torsion .24
7.3.3 Bending moment .24
7.3.4 Torsion and bending tests .24
7.4 Rated flow rate .28
7.4.1 General.28
7.4.2 Requirements .28
7.4.3 Test .28
7.5 Durability .30
7.5.1 Elastomers in contact with gas .30
7.5.2 Resistance of elastomers to lubricants and gases .30
7.5.3 Marking resistance .31
7.5.4 Resistance to scratching .31
7.5.5 Resistance to humidity .32
7.6 Functional requirements .33
7.7 Endurance .33
7.8 Vibration test .33
8 Electrical equipment .33
8.1 General .33
8.2 Requirements .33
8.3 Test .34
8.4 Protection by enclosure.34
9 Electromagnetic compatibility (EMC) .34
9.1 Protection against environmental influences .34
9.1.1 General.34
9.1.2 Requirements .34
9.1.3 Test .35
9.2 Harmonics and interharmonics including mains signalling at a.c. power port, low
frequency immunity .35
9.2.1 General.35
9.2.2 Requirements .35
9.2.3 Test .35
9.3 Voltage dips, voltage interruptions and voltage variations in the power supply network 35
9.3.1 Voltage dips and voltage interruptions .35
9.3.2 Test .35
9.3.3 Voltage variation .36
9.4 Test of influence of voltage unbalance .36
9.5 Surge immunity tests .36
9.5.1 General.36
9.5.2 Requirements .36
9.5.3 Test .37
9.6 Electrical fast transient/burst .37
9.6.1 General.37
9.6.2 Requirements .37
9.6.3 Test .37
9.7 Ring wave immunity .37
9.7.1 General.37
9.7.2 Requirements .37
9.7.3 Test .37
9.8 Electrostatic discharge .37
9.8.1 General.37
iv © ISO 2018 – All rights reserved

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ISO 23550:2018(E)

9.8.2 Requirements .38
9.8.3 Test .38
9.9 Radio-frequency electromagnetic field immunity .38
9.9.1 Immunity to conducted disturbances .38
9.9.2 Immunity to radiated disturbances .38
9.10 Influence of supply frequency variations .39
9.10.1 General.39
9.10.2 Requirements .39
9.10.3 Test .39
9.11 Power frequency magnetic field immunity .39
9.11.1 General.39
9.11.2 Requirements .39
9.11.3 Test .39
9.12 Evaluation of compliance .39
10 Marking, installation and operating instructions .39
10.1 Marking .39
10.2 Installation and operating instructions .39
10.3 Warning notice .40
Annex A (informative) Leak-tightness test — Volumetric method .41
Annex B (informative) Leak-tightness test — Pressure-loss method .43
Annex C (normative) Conversion of pressure loss into leakage rate .44
Annex D (normative) Gas quick connector (GQC) .45
Annex E (normative) Elastomers/requirements resistance to lubricants and gas .51
Annex F (normative) Specific regional requirements in European countries .59
Annex G (normative) Specific regional requirements in Canada and USA .60
Annex H (normative) Specific regional requirements in Japan .62
Bibliography .65
© ISO 2018 – All rights reserved v

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ISO 23550:2018(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 on 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 the following
URL: 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.
This third edition cancels and replaces the second edition (ISO 23550:2011), which has been technically
revised. The main changes compared to the previous edition are as follows:
— a new structure has been introduced with a clear separation between general statements,
requirements and test;
— this document has been updated and aligned with the relevant parts of IEC 60730-1:2013;
— the Scope now specifies controls for use at maximum operating pressures up to and including
500 kPa;
— the Introduction and Clauses 2 and 3 have been updated;
— the structure of Clauses 4 to 10 have been modified;
— in Formula (2), the air flow rate at standard conditions has been corrected;
— Annexes D to H have been created;
— the Bibliography has been updated.
vi © ISO 2018 – All rights reserved

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ISO 23550:2018(E)

Introduction
This document provides general requirements for controls and safety devices for gas burners and gas
burning appliances, and is intended to be used in conjunction with the ISO 23551, ISO 23552 and the
ISO 23553 series for specific types of controls, 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 cont
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