Testing of valves - Fire type-testing requirements (ISO 10497:2022)

This document specifies fire type-testing requirements and a fire type-test method for soft- and metalseated isolation valves with one or more obturators. It is not applicable to the testing requirements for
valve actuators other than manually operated gearboxes or similar mechanisms when these form part
of the normal valve assembly. Other types of valve actuators (e.g. electrical, pneumatic or hydraulic)
can need special protection to operate in the environment considered in this valve test, and the fire
testing of such actuators is outside the scope of this document.
This document specifies the measurement and assessment criteria for:
a) through-seat leakage;
b) external leakage;
c) cavity overpressure relief of double-seated valves;
d) operability.
This document specifies the rules whereby the fire-type testing qualification for a valve can be extended
to untested sizes, pressure ratings and materials of construction of the same basic design type.
Fire test reports of valves tested according to previous editions of this document are acceptable when
submitted together with the full and compliant fire test report as per 6.7 of the edition under which it
was tested. Any data missing as required from 6.7 within the fire test report are accepted or rejected at
the purchaser’s discretion.
NOTE For the purposes of this document, the terms “fire type-test” and “fire test” are synonymous.

Prüfung von Armaturen - Anforderungen an die Typprüfung auf Feuersicherheit (ISO 10497:2022)

Dieses Dokument legt Anforderungen an die Typprüfung auf Feuersicherheit und das zugehörige Verfahren für Armaturen mit einem oder mehreren Abschlusskörpern fest. Es enthält keine Prüfanforderungen an Stellantriebe, ausgenommen handbetätigte Schaltgetriebe oder ähnliche Mechanismen, wenn diese Teile der Standardausführung sind. Andere Stellantriebe (z. B. elektrische, pneumatische oder hydraulische) müssen eventuell für diese Armaturenprüfung mit einem besonderen Schutz versehen werden und die Prüfung der Feuersicherheit solcher Antriebe liegt nicht im Anwendungsbereich dieses Dokuments.
Dieses Dokument legt die Mess- und Beurteilungskriterien für Folgende fest:
a) Undichtheit des Sitzes;
b) äußere Undichtheit;
c) Überdruckentlastung im Gehäuseinnenraum von Doppelsitzventilen;
d) Bedienbarkeit.
Dieses Dokument legt die Regeln fest, nach denen der Eignungsnachweis aus der Typprüfung auf Feuersicherheit eines Ventils auf ungeprüfte Nennweiten, Druckstufen und Werkstoffe der gleichen Grundbauart erweitert werden kann.
Prüfberichte zu Prüfungen auf Feuersicherheit von nach vorherigen Ausgaben von ISO 10497 geprüften Armaturen sind annehmbar, wenn sie zusammen mit dem vollständigen und konformen Prüfbericht zur Prüfung auf Feuersicherheit nach 6.7 dieser Ausgabe eingereicht werden, nachdem sie geprüft wurden. Für Doppelsitzventile, bei denen die Einstellung des Druckentlastungsventils für den Gehäuseinnenraum nicht im ursprünglichen Prüfbericht zur Prüfung auf Feuersicherheit dokumentiert wurde, sind zusätzliche Prüfungen festgelegt.
ANMERKUNG Für die Anwendung dieses Dokuments sind die Begriffe „Typprüfung auf Feuersicherheit“ und „Feuersicherheitsprüfung“ gleichbedeutend.

Essais des appareils de robinetterie - Exigences de l'essai au feu (ISO 10497:2022)

Le présent document spécifie les exigences d'un essai type au feu et une méthode d'essai type au feu pour les robinets d'isolation à siège souple et métallique avec un obturateur ou plus. Il ne traite pas des conditions d'essai des actionneurs des appareils de robinetterie autres que des réducteurs manuels ou autres mécanismes du même type liés à l'appareil normalement assemblé. D'autres types d'actionneurs (par exemple électriques, pneumatiques ou hydrauliques) peuvent, compte tenu des conditions du présent essai, nécessiter des protections particulières, et leur contrôle sort du cadre du présent document.
Le présent document spécifie les critères de mesurage et d’évaluation pour:
a) les fuites à travers le siège;
b) les fuites externes;
c) l’évacuation de la surpression dans la cavité des appareils de robinetterie à double siège;
d) la manœuvrabilité.
Le présent document spécifie les règles pour étendre la qualification de l’essai de type au feu d’un appareil de robinetterie de même conception de base, à des dimensions, des pressions et des matériaux de construction non soumis à essai.
Les rapports d’essai au feu d’appareils de robinetterie soumis à essai selon les éditions précédentes du présent document sont acceptables quand ils sont soumis avec un rapport d’essai au feu complet et conforme au 6.7 de l’édition selon laquelle il a été soumis à essai. Toutes données manquantes telles que requises en 6.7 dans le rapport d’essai au feu sont acceptées ou rejetées sur décision de l'acheteur.
NOTE          Pour les besoins du présent document, les termes “essai de type au feu” et “essai au feu” sont synonymes.

Preskušanje ventilov - Zahteve za protipožarno preskušanje (ISO 10497:2022)

Ta dokument določa zahteve za protipožarno preskušanje in protipožarno metodo za mehke in kovinske zaporne ventile z enim ali več čepi. Ne uporablja se za zahteve glede preskušanja sprožil ventilov, razen ročnih menjalnikov ali podobnih mehanizmov, če so ti del običajnega sklopa ventilov. Za druge vrste sprožil ventilov (npr. električnih, pnevmatskih ali hidravličnih) je morda potrebna posebna zaščita, če delujejo v okolju, obravnavanem v tem preskusu ventilov, požarno preskušanje takih sprožil pa je zunaj področja uporabe tega dokumenta. Ta dokument določa merila, s katerimi se meri in ocenjuje: a) puščanje skozi sedež ventila; b) zunanje puščanje; c) razbremenitev nadtlaka v votlini dvosedežnih ventilov; d) operativnost. Ta dokument določa pravila, po katerih se lahko razvrstitev protipožarnega preskusa za ventil razširi na nepreizkušene velikosti, nazivne tlake in materiale konstrukcije iste osnovne zasnove. Poročila o požarnem preskusu ventilov, preskušenih v skladu s prejšnjimi izdajami tega dokumenta, so sprejemljiva, če so predložena skupaj s popolnim in skladnim poročilom o požarnem preskusu v skladu s točko 6.7 izdaje, na podlagi katere je bil opravljen preskus. Kupec po lastni presoji sprejme ali zavrne morebitne manjkajoče podatke v skladu s točko 6.7 v poročilu o požarnem preskusu. OPOMBA: Za namene tega dokumenta sta izraza »protipožarni preskus« in »požarni preskus« enakovredna.

General Information

Status
Published
Public Enquiry End Date
01-Sep-2021
Publication Date
27-Nov-2022
Current Stage
6060 - National Implementation/Publication (Adopted Project)
Start Date
23-Nov-2022
Due Date
28-Jan-2023
Completion Date
28-Nov-2022

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Standards Content (Sample)

SLOVENSKI STANDARD
SIST EN ISO 10497:2023
01-januar-2023
Nadomešča:
SIST EN ISO 10497:2011
Preskušanje ventilov - Zahteve za protipožarno preskušanje (ISO 10497:2022)
Testing of valves - Fire type-testing requirements (ISO 10497:2022)
Prüfung von Armaturen - Anforderungen an die Typprüfung auf Feuersicherheit (ISO
10497:2022)

Essais des appareils de robinetterie - Exigences de l'essai au feu (ISO 10497:2022)

Ta slovenski standard je istoveten z: EN ISO 10497:2022
ICS:
13.220.40 Sposobnost vžiga in Ignitability and burning
obnašanje materialov in behaviour of materials and
proizvodov pri gorenju products
23.060.01 Ventili na splošno Valves in general
SIST EN ISO 10497:2023 en,fr,de

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

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SIST EN ISO 10497:2023
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SIST EN ISO 10497:2023
EN ISO 10497
EUROPEAN STANDARD
NORME EUROPÉENNE
November 2022
EUROPÄISCHE NORM
ICS 23.060.01 Supersedes EN ISO 10497:2010
English Version
Testing of valves - Fire type-testing requirements (ISO
10497:2022)

Essais des appareils de robinetterie - Exigences de Prüfung von Armaturen - Anforderungen an die

l'essai au feu (ISO 10497:2022) Typprüfung auf Feuersicherheit (ISO 10497:2022)
This European Standard was approved by CEN on 2 October 2022.

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

© 2022 CEN All rights of exploitation in any form and by any means reserved Ref. No. EN ISO 10497:2022 E

worldwide for CEN national Members.
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SIST EN ISO 10497:2023
EN ISO 10497:2022 (E)
Contents Page

European foreword ....................................................................................................................................................... 3

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SIST EN ISO 10497:2023
EN ISO 10497:2022 (E)
European foreword

This document (EN ISO 10497:2022) has been prepared by Technical Committee ISO/TC 153 "Valves"

in collaboration with Technical Committee CEN/TC 69 “Industrial valves” the secretariat of which is

held by AFNOR.

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 May 2023, and conflicting national standards shall be

withdrawn at the latest by May 2023.

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.

This document supersedes EN ISO 10497:2010.

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 10497:2022 has been approved by CEN as EN ISO 10497:2022 without any modification.

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SIST EN ISO 10497:2023
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SIST EN ISO 10497:2023
INTERNATIONAL ISO
STANDARD 10497
Fourth edition
2022-10
Testing of valves — Fire type-testing
requirements
Essais des appareils de robinetterie — Exigences de l'essai au feu
Reference number
ISO 10497:2022(E)
© ISO 2022
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SIST EN ISO 10497:2023
ISO 10497:2022(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
© ISO 2022 – All rights reserved
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SIST EN ISO 10497:2023
ISO 10497:2022(E)
Contents Page

Foreword ........................................................................................................................................................................................................................................iv

Introduction .................................................................................................................................................................................................................................v

1 Scope ................................................................................................................................................................................................................................. 1

2 Normative references ..................................................................................................................................................................................... 1

3 Terms and definitions .................................................................................................................................................................................... 1

4 Test conditions .......................................................................................................................................................................................................3

4.1 Direction and conditions for valves to be tested ..................................................................................................... 3

4.2 Pressure relief provision ............................................................................................................................................................... 3

5 Fire test method ...................................................................................................................................................................................................4

5.1 General warning .................................................................................................................................................................................... 4

5.2 Principle ....................................................................................................................................................................................................... 4

5.3 Apparatus .................................................................................................................................................................................................... 4

5.3.1 General ........................................................................................................................................................................................ 4

5.3.2 Specific apparatus ............................................................................................................................................................. 5

5.4 Test fluid ....................................................................................................................................................................................................... 5

5.5 Test fuel ......................................................................................................................................................................................................... 6

5.6 Procedure .................................................................................................................................................................................................... 6

6 Performance ..........................................................................................................................................................................................................11

6.1 General ........................................................................................................................................................................................................ 11

6.2 Through-seat leakage during burn period ................................................................................................................. 11

6.3 External leakage during burn and cool-down periods .................................................................................... 11

6.4 Low-pressure test through-seat leakage after cool-down ........................................................................... 11

6.5 Operability ..............................................................................................................................................................................................12

6.6 External leakage following operational test .............................................................................................................12

6.7 Test report ...............................................................................................................................................................................................12

7 Qualification of other valves by representative size, pressure rating, design

considerations and materials of construction ..................................................................................................................14

7.1 General ........................................................................................................................................................................................................ 14

7.2 Design considerations ................................................................................................................................................................... 14

7.3 Materials of construction ...........................................................................................................................................................15

7.4 Decisions by purchaser ................................................................................................................................................................ 16

7.5 Qualification of valves by nominal size and pressure rating ..................................................................... 16

8 Special marking .................................................................................................................................................................................................17

Bibliography .............................................................................................................................................................................................................................18

iii
© ISO 2022 – All rights reserved
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SIST EN ISO 10497:2023
ISO 10497:2022(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 153, Valves, in collaboration with the

European Committee for Standardization (CEN) Technical Committee CEN/TC 69, Industrial valves, in

accordance with the Agreement on technical cooperation between ISO and CEN (Vienna Agreement).

This fourth edition cancels and replaces the third edition (ISO 10497:2010), which has been technically

revised.
The main changes compared are as follows:

— clarification and emphasised importance around the monitoring of cavity pressure during testing

for double-seated valves;
— catering for the testing of valves with more than one obturator;

— update of the qualification of other valves by “materials of construction” and inclusion of a new

“design” clause;
— accepted fire test certificates of valves tested according to ISO 10497:2010.

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.
© ISO 2022 – All rights reserved
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SIST EN ISO 10497:2023
ISO 10497:2022(E)
Introduction

This document covers the requirements and method for evaluating the performance of valves when

they are exposed to specified fire conditions. The performance requirements establish limits of

acceptability of a valve, regardless of size, material or pressure rating. The burn period has been

established to represent the maximum time required to extinguish most fires. Fires of longer duration

are considered to be of major magnitude, with consequences greater than those anticipated in the test.

The test pressure during the burn is set at 0,2 MPa (2 bar) for soft-seated valves rated PN 10, PN 16,

PN 25 and PN 40, Class 150 and Class 300, to better simulate the conditions that would be expected in

a process plant when a fire is detected, and pumps are shut down. In this case, the source of pressure

in the system is the hydrostatic head resulting from liquid levels in towers and vessels. This situation is

approximated by this lower test pressure.

In production facilities, valves are typically of a higher rating and the pressure source is not easily

reduced when a fire is detected. Therefore, for all other valves, the test pressure during the burn is set

at a higher value to better simulate the expected service conditions in these facilities.

Use of this document assumes that the execution of its provisions is entrusted to appropriately qualified

and experienced personnel, because it calls for procedures that can be injurious to health, if adequate

precautions are not taken. This document refers only to technical suitability and does not absolve the

user from legal obligations relating to health and safety at any stage of the procedure.

This document highlights the importance of accurate monitoring and recording of test data during

fire testing. The monitoring and measuring of cavity pressure has been emphasised for all double-

seated valves. Empirical evidence has shown that the cavity pressure during a fire test can increase

significantly unless relieved internally (by design) or externally. Without meeting the minimum

requirements of the test report, valves cannot be certified as a fire safe design to this document.

It is recognised by this document that not all combinations of potential trim arrangements can be

covered by a single fire test report. Certain design or material differences can be accepted by the

purchaser if they do not influence sealing or operating performance. Further clarification on soft

materials grouping and bolting has been included in this document.

Valves with more than one obturator are regularly used for in-line isolation and instrumentation

service. As such, the need to qualify such designs as fire safe certified is now a common requirement.

This document now caters for such valve designs.
© ISO 2022 – All rights reserved
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SIST EN ISO 10497:2023
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SIST EN ISO 10497:2023
INTERNATIONAL STANDARD ISO 10497:2022(E)
Testing of valves — Fire type-testing requirements
1 Scope

This document specifies fire type-testing requirements and a fire type-test method for soft- and metal-

seated isolation valves with one or more obturators. It is not applicable to the testing requirements for

valve actuators other than manually operated gearboxes or similar mechanisms when these form part

of the normal valve assembly. Other types of valve actuators (e.g. electrical, pneumatic or hydraulic)

can need special protection to operate in the environment considered in this valve test, and the fire

testing of such actuators is outside the scope of this document.
This document specifies the measurement and assessment criteria for:
a) through-seat leakage;
b) external leakage;
c) cavity overpressure relief of double-seated valves;
d) operability.

This document specifies the rules whereby the fire-type testing qualification for a valve can be extended

to untested sizes, pressure ratings and materials of construction of the same basic design type.

Fire test reports of valves tested according to previous editions of this document are acceptable when

submitted together with the full and compliant fire test report as per 6.7 of the edition under which it

was tested. Any data missing as required from 6.7 within the fire test report are accepted or rejected at

the purchaser’s discretion.

NOTE For the purposes of this document, the terms “fire type-test” and “fire test” are synonymous.

2 Normative references
There are no normative references in this document.
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
nominal size

alphanumeric designation of size for components of a pipework system, which is used for reference

purposes, comprising the letters DN followed by a dimensionless whole number which is indirectly

related to the physical size, in millimetres, of the bore or outside diameter of the end connections

[SOURCE: ISO 6708:1995, 2.1, modified — The Notes 1 and 2 to entry have been removed and the term

"nominal size" has been added.]
© ISO 2022 – All rights reserved
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SIST EN ISO 10497:2023
ISO 10497:2022(E)
3.2
nominal pressure

numerical designation relating to pressure which is a convenient rounded number for reference

purposes, and which comprises the letters PN followed by the appropriate reference number

Note 1 to entry: It is intended that all equipment of the same nominal size (DN) (3.1) designated by the same PN

number have compatible mating dimensions.

Note 2 to entry: The maximum allowable pressure depends on materials, design and working temperatures, and

is selected from the tables of pressure/temperature ratings given in the appropriate standards.

[SOURCE: ISO 7268:1983, Clause 2, modified — The phrase "and which comprises the letters PN

followed by the appropriate reference number" was added.]
3.3
NPS

alphanumeric designation of size for components of a pipework system, which is used for reference

purposes, and which comprises the letters NPS followed by a dimensionless number indirectly related

to the physical size of the bore or outside diameter of the end connections

Note 1 to entry: The number following the letters NPS does not represent a measurable value and is not intended

to be used for calculation purposes except where specified in the relevant standard.

3.4
Class

alphanumeric designation used for reference purposes related to a combination of mechanical and

dimensional characteristics of a component of a pipework system, which comprises the word “Class”

followed by a dimensionless whole number

Note 1 to entry: The number following the word “Class” does not represent a measurable value and is not intended

to be used for calculation purposes except where specified in the relevant standard.

3.5
symmetric-seated valve

valve with an internal construction, which has a plane of symmetry perpendicular to the axis of the

body ends

Note 1 to entry: This is a valve where both seat and sealing elements are identical.

3.6
asymmetric-seated valve

valve with an internal construction, which has no plane of symmetry perpendicular to the axis of the

body ends

Note 1 to entry: This is a valve with a single seat offset from the shaft centreline or containing a twin-seated

arrangement where both seats are not identical such as one bidirectional seat and one self-relieving seat.

3.7
soft seat

seat or sealing element made from, or including, thermoplastic, polymeric or elastomeric material

which will burn during the fire test
3.8
obturator

movable component of the valve whose position in the fluid flow path permits, restricts or obstructs

the fluid flow
3.9
double-seated valve

valve which utilises two seats for each obturator (3.8), resulting in a closed pressure sealed cavity, such

as a trunnion mounted or floating ball valve, gate valve, plug valve
© ISO 2022 – All rights reserved
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SIST EN ISO 10497:2023
ISO 10497:2022(E)
3.10
isolating valve
valve intended for use only in the closed or fully open position
[SOURCE: EN 736-1:2018, 5.2]
4 Test conditions
4.1 Direction and conditions for valves to be tested

4.1.1 Symmetric-seated valves intended by the manufacturer for bidirectional installation shall be

tested in one direction only.

4.1.2 Asymmetric-seated valves intended by the manufacturer for bidirectional installation shall be

tested by carrying out the burn test procedure twice, once in each direction of the potential installation.

The same valve may be refurbished and retested, or another, identical, valve may be tested in the other

direction.

4.1.3 Valves intended solely for unidirectional installation shall be clearly and permanently marked

as such, and shall be tested in the stated direction of installation.

4.1.4 If the valve being tested is fitted with a gearbox or other such manual device, only that particular

assembly shall qualify. If a valve can be supplied with or without a gearbox, testing with a gearbox

fitted shall qualify valves without a gearbox, but not the converse.

4.1.5 Valves (and gearboxes) shall not be protected with insulation material of any form during

testing, except where such protection is part of the design of the component(s).

4.1.6 For valves with more than one obturator, if all seals and obturators are of the same design,

through-seat leak testing of the upstream obturator in a single direction shall qualify all obturators in

both directions. Asymmetric valves shall be tested on the upstream block in both directions.

For valves with more than one obturator, a qualified assembly is one where all obturators have been

qualified in single valves that use the same obturator and seat/seal design.

If required by the purchaser, tests of a complete manifold assembly shall be subject to agreement

between purchaser and manufacturer. The test procedure used shall be agreed by all parties.

The complete assembly, including any auxiliary connections, vents and drains shall be subjected to the

fire. The upstream obturator shall be in the closed position and the downstream obturator shall be in

the partially open position throughout the test. Testing for external leakage shall be on the complete

assembly.

If the valve is comprised of an external vent valve, this shall be in the closed position. All other auxiliary

connections shall be blinded sufficiently.
4.2 Pressure relief provision

4.2.1 If the valve under test incorporates a means of relieving cavity pressure as part of its standard

design and if this provision activates during the fire test, the test shall be continued and any leakage to

atmosphere from the provision shall be measured and counted as external leakage. If the design is such

that the provision vents to the downstream side of the valve, any leakage shall be counted as through-

seat leakage (see 5.6.11 and 5.6.13).
© ISO 2022 – All rights reserved
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SIST EN ISO 10497:2023
ISO 10497:2022(E)

4.2.2 The test shall be stopped and considered void if the cavity pressure is exceeded which activates

the relief valve described in 5.3.2.8.

4.2.3 Double-seated valves tested in compliance with a previous edition of this document where the

body cavity relief valve setting and/or cavity pressure during testing was not recorded in the original

test report shall be subjected to a supplementary test before claiming compliance with this edition.

An overpressure cavity relief test at ambient conditions shall be undertaken to demonstrate the relief

performance mechanism of the valve with the test report appended to the original fire test report. Test

pressure shall be as specified in 5.3.2.8.
5 Fire test method
5.1 General warning

Fire testing of valves is potentially hazardous and it is essential that the safety of personnel be given

prime consideration. Given the nature of the fire test and the possibility of weaknesses in the design of

the test valve and test equipment, hazardous rupture of the pressure boundary could occur. Adequate

shields in the area of the test enclosure and other appropriate means for the protection of personnel are

necessary.

Fire testing shall be void if the product or system fails to perform within the limits specified, except

when such failure is determined to be the result of a failure within the test facility or test fixture and

that failure and its correction do not affect the validity of the test results.
5.2 Principle

A closed valve, completely filled with water under pressure, is completely enveloped in flames with

an environmental temperature in the region of the valve of 750 °C to 1 000 °C for a period of 30 min.

The objective is to completely envelop the valve in flames to assure that the seat and sealing areas

are exposed to the high burn temperature. The intensity of the heat input shall be monitored using

thermocouples and calorimeter cubes as specified in 5.6.7 and 5.6.8. During this period the internal

and external leakage is recorded. After cool-down from the fire test, the valve is hydrostatically tested

to assess the pressure containing capability of the valve shell, seats and seals.

5.3 Apparatus
5.3.1 General

The test equipment shall not subject the valve to externally applied stress affecting the results of the

test.

Schematic diagrams of recommended systems for fire type-testing of valves are given in Figure 1.

Potential pipework-to-valve end connection joint leakage is not evaluated as part of the test and is not

included in the allowable external leakage (see 6.3 and 6.6). For the purposes of this test, it may be

necessary to modify these joints to eliminate leakage
...

SLOVENSKI STANDARD
oSIST prEN ISO 10497:2021
01-september-2021
Preskušanje ventilov - Zahteve za protipožarno preskušanje (ISO/DIS 10497:2021)
Testing of valves - Fire type-testing requirements (ISO/DIS 10497:2021)

Prüfung von Armaturen - Anforderungen an die Typprüfung auf Feuersicherheit (ISO/DIS

10497:2021)

Essais des appareils de robinetterie - Exigences de l'essai au feu (ISO/DIS 10497:2021)

Ta slovenski standard je istoveten z: prEN ISO 10497
ICS:
13.220.40 Sposobnost vžiga in Ignitability and burning
obnašanje materialov in behaviour of materials and
proizvodov pri gorenju products
23.060.01 Ventili na splošno Valves in general
oSIST prEN ISO 10497:2021 en,fr,de

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

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oSIST prEN ISO 10497:2021
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oSIST prEN ISO 10497:2021
DRAFT INTERNATIONAL STANDARD
ISO/DIS 10497
ISO/TC 153 Secretariat: AFNOR
Voting begins on: Voting terminates on:
2021-06-09 2021-09-01
Testing of valves — Fire type-testing requirements
Essais des appareils de robinetterie — Exigences de l'essai au feu
ICS: 23.060.01
THIS DOCUMENT IS A DRAFT CIRCULATED
This document is circulated as received from the committee secretariat.
FOR COMMENT AND APPROVAL. IT IS
THEREFORE SUBJECT TO CHANGE AND MAY
NOT BE REFERRED TO AS AN INTERNATIONAL
STANDARD UNTIL PUBLISHED AS SUCH.
IN ADDITION TO THEIR EVALUATION AS
ISO/CEN PARALLEL PROCESSING
BEING ACCEPTABLE FOR INDUSTRIAL,
TECHNOLOGICAL, COMMERCIAL AND
USER PURPOSES, DRAFT INTERNATIONAL
STANDARDS MAY ON OCCASION HAVE TO
BE CONSIDERED IN THE LIGHT OF THEIR
POTENTIAL TO BECOME STANDARDS TO
WHICH REFERENCE MAY BE MADE IN
Reference number
NATIONAL REGULATIONS.
ISO/DIS 10497:2021(E)
RECIPIENTS OF THIS DRAFT ARE INVITED
TO SUBMIT, WITH THEIR COMMENTS,
NOTIFICATION OF ANY RELEVANT PATENT
RIGHTS OF WHICH THEY ARE AWARE AND TO
PROVIDE SUPPORTING DOCUMENTATION. ISO 2021
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oSIST prEN ISO 10497:2021
ISO/DIS 10497:2021(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.
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Published in Switzerland
ii © ISO 2021 – All rights reserved
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oSIST prEN ISO 10497:2021
ISO/DIS 10497:2021(E)
Contents Page

Foreword ........................................................................................................................................................................................................................................iv

Introduction ..................................................................................................................................................................................................................................v

1 Scope ................................................................................................................................................................................................................................. 1

2 Normative references ...................................................................................................................................................................................... 1

3 Terms and definitions ..................................................................................................................................................................................... 1

4 Test conditions ....................................................................................................................................................................................................... 3

4.1 Direction and conditions for valves to be tested ........................................................................................................ 3

4.2 Pressure relief provision ................................................................................................................................................................ 3

5 Fire test method .................................................................................................................................................................................................... 4

5.1 General warning ..................................................................................................................................................................................... 4

5.2 Principle ........................................................................................................................................................................................................ 4

5.3 Apparatus .................................................................................................................................................................................................... 4

5.3.1 General...................................................................................................................................................................................... 4

5.3.2 Specific apparatus ........................................................................................................................................................... 4

5.4 Test fluid ....................................................................................................................................................................................................... 5

5.5 Test fuel ......................................................................................................................................................................................................... 5

5.6 Procedure .................................................................................................................................................................................................... 5

6 Performance ...........................................................................................................................................................................................................11

6.1 General ........................................................................................................................................................................................................11

6.2 Through-seat leakage during burn period ...................................................................................................................11

6.3 External leakage during burn and cool-down periods ......................................................................................11

6.4 Low-pressure test through-seat leakage after cool down ..............................................................................11

6.5 Operability ...............................................................................................................................................................................................12

6.6 External leakage following operational test ...............................................................................................................12

6.7 Test report ................................................................................................................................................................................................12

7 Qualification of other valves by representative size, pressure rating, design

considerations and materials of construction ......... ...........................................................................................................14

7.1 General ........................................................................................................................................................................................................14

7.2 Design considerations....................................................................................................................................................................14

7.3 Materials of construction ............................................................................................................................................................15

7.4 Decisions by purchaser .................................................................................................................................................................16

7.5 Qualification of valves by nominal size and pressure rating ........................................................................16

8 Special marking ..................................................................................................................................................................................................17

Bibliography .............................................................................................................................................................................................................................18

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oSIST prEN ISO 10497:2021
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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 153, Valves.

This fourth edition cancels and replaces the third edition (ISO 10497:2010), which has been technically

revised.
The main changes compared to the previous edition are as follows:

— clarification and emphasised importance around the monitoring of cavity pressure during testing

for double seated valves;
— catering for the testing of valves with more than one obturator;

— update of the qualification of other valves by “materials of construction” and inclusion of a new

“design” clause;
— accepted fire test certificates of valves tested according to ISO 10497:2010.

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.
iv © ISO 2021 – All rights reserved
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oSIST prEN ISO 10497:2021
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Introduction

This document covers the requirements and method for evaluating the performance of valves when they

are exposed to defined fire conditions. The performance requirements establish limits of acceptability

of a valve, regardless of size, material or pressure rating. The burn period has been established to

represent the maximum time required to extinguish most fires. Fires of longer duration are considered

to be of major magnitude, with consequences greater than those anticipated in the test.

The test pressure during the burn is set at 0,2 MPa (2 bar) for soft-seated valves rated PN 10, PN 16,

PN 25 and PN 40, Class 150 and Class 300, to better simulate the conditions that would be expected in

a process plant when a fire is detected, and pumps are shut down. In this case, the source of pressure

in the system is the hydrostatic head resulting from liquid levels in towers and vessels. This situation is

approximated by this lower test pressure.

In production facilities, valves are typically of a higher rating and the pressure source is not easily

reduced when a fire is detected. Therefore, for all other valves, the test pressure during the burn is set

at a higher value to better simulate the expected service conditions in these facilities.

Use of this document assumes that the execution of its provisions is entrusted to appropriately qualified

and experienced personnel, because it calls for procedures that can be injurious to health, if adequate

precautions are not taken. This document refers only to technical suitability and does not absolve the

user from legal obligations relating to health and safety at any stage of the procedure.

This document highlights the importance of accurate monitoring and recording of test data during

fire testing. The monitoring and measuring of cavity pressure has been emphasised for all double

seated valves. Empirical evidence has shown that the cavity pressure during a fire test can increase

significantly unless relieved internally (by design) or externally. Without meeting the minimum

requirements of the test report, valves cannot be certified as a fire safe design to this document.

It is recognised by this document that not all combinations of potential trim arrangements can be

covered by a single fire test report. Certain design or material differences can be accepted by the

purchaser if they do not influence sealing or operating performance. Further clarification on soft

materials grouping and bolting has been included in this document.

Valves with more than one obturator are regularly used for in-line isolation and instrumentation

service. As such, the need to qualify such designs as fire safe certified is now a common requirement.

This document now caters for such valve designs.
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oSIST prEN ISO 10497:2021
DRAFT INTERNATIONAL STANDARD ISO/DIS 10497:2021(E)
Testing of valves — Fire type-testing requirements
1 Scope

This document specifies fire type-testing requirements and a fire type-test method for valves with

one or more obturators. It is not applicable to the testing requirements for valve actuators other

than manually operated gearboxes or similar mechanisms when these form part of the normal valve

assembly. Other types of valve actuators (e.g. electrical, pneumatic or hydraulic) can need special

protection to operate in the environment considered in this valve test, and the fire testing of such

actuators is outside the scope of this document.
This document specifies the measurement and assessment criteria for:
a) through-seat leakage;
b) external leakage;
c) cavity overpressure relief of double seated valves;
d) operability.

This document specifies the rules whereby the fire-type testing qualification for a valve can be extended

to untested sizes, pressure ratings, and materials of construction of the same basic design type.

Fire test reports of valves tested according to previous editions of ISO 10497 are acceptable when

submitted together with the full and compliant fire test report as per 6.7 of the edition under which it

was tested. Additional testing is specified for double seated valves where the body cavity relief valve

setting was not recorded in the original fire test report.

NOTE For the purposes of this document, the terms “fire type-test” and “fire test” are synonymous.

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.

IEC 60584-2, Thermocouples — Part 2: Tolerances
3 Terms and definitions
For the purposes of this document, the following terms and definitions 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
nominal size

DNalphanumeric designation of size for components of a pipework system, which is used for reference

purposes, comprising the letters DN followed by a dimensionless whole number which is indirectly

related to the physical size, in millimetres, of the bore or outside diameter of the end connections

[SOURCE: ISO 6708:1995, definition 2.1]
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3.2
nominal pressure

numerical designation relating to pressure which is a convenient rounded number for reference

purposes, and which comprises the letters PN followed by the appropriate reference number

Note 1 to entry: It is intended that all equipment of the same nominal size (DN) designated by the same PN

number have compatible mating dimensions.

Note 2 to entry: The maximum allowable pressure depends on materials, design and working temperatures, and

is selected from the tables of pressure/temperature ratings given in the appropriate standards.

[SOURCE: ISO 7268:1983, Clause 2, modified.]
3.3
NPS

alphanumeric designation of size for components of a pipework system, which is used for reference

purposes, and which comprises the letters NPS followed by a dimensionless number indirectly related

to the physical size of the bore or outside diameter of the end connections

Note 1 to entry: The number following the letters NPS does not represent a measurable value and is not intended

to be used for calculation purposes except where specified in the relevant standard.

3.4
Class

alphanumeric designation used for reference purposes related to a combination of mechanical and

dimensional characteristics of a component of a pipework system, which comprises the word “Class”

followed by a dimensionless whole number

Note 1 to entry: The number following the word “Class” does not represent a measurable value and is not intended

to be used for calculation purposes except where specified in the relevant standard.

3.5
symmetric seated valve

valve with an internal construction, which has a plane of symmetry perpendicular to the axis of the

body ends

Note 1 to entry: This is a valve where both seat and sealing elements are identical.

3.6
asymmetric seated valve

valve with an internal construction, which has no plane of symmetry perpendicular to the axis of the

body ends

Note 1 to entry: This is a valve with a single seat offset from the shaft centreline or containing a twin seated

arrangement where both seats are not identical such as one bi-directional seat and one self-relieving seat.

3.7
soft seated

seat or sealing element made from, or including, thermoplastic, polymeric or elastomeric material

3.8
obturator

movable component of the valve whose position in the fluid flow path permits, restricts or obstructs

the fluid flow
3.9
double seated valve

valve which utilises two seats for each obturator, resulting in a cavity, such as a trunnion mounted or

floating ball valve, gate valve, plug valve
2 © ISO 2021 – All rights reserved
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4 Test conditions
4.1 Direction and conditions for valves to be tested

4.1.1 Symmetric seated valves intended by the manufacturer for bi-directional installation shall be

tested in one direction only.

4.1.2 Asymmetric seated valves intended by the manufacturer for bi-directional installation shall be

tested by carrying out the burn test procedure twice, once in each direction of the potential installation.

The same valve may be refurbished and re-tested, or another, identical, valve may be tested in the other

direction.

4.1.3 Valves intended solely for unidirectional installation shall be clearly and permanently marked as

such, and shall be tested in the stated direction of installation.

4.1.4 If the valve being tested is fitted with a gearbox or other such manual device, only that particular

assembly shall qualify. If a valve can be supplied with or without a gearbox, testing with a gearbox fitted

shall qualify valves without a gearbox, but not the converse.

4.1.5 Valves (and gearboxes) shall not be protected with insulation material of any form during testing,

except where such protection is part of the design of the component(s).

4.1.6 For valves with more than one obturator, if all seals and obturators are of the same design,

through-seat leak testing of the upstream obturator in a single direction shall qualify all obturators in

both directions. Asymmetric valves shall be tested on the upstream block in both directions.

For valves with more than one obturator, a qualified assembly is one where all obturators have been

qualified in single valves that use the same obturator and seat/ seal design.

If required by the purchaser, tests of a complete manifold assembly shall be subject to agreement

between purchaser and manufacturer. The test procedure used shall be agreed by all parties.

The complete assembly, including any auxiliary connections, vents, drains shall be subjected to the

fire. The upstream obturator shall be in the closed position and the downstream obturator shall be in

the partially open position throughout the test. Testing for external leakage shall be on the complete

assembly.

If the valve comprises of an external vent valve, this shall be in the closed position. All other auxiliary

connections shall be blinded sufficiently.
4.2 Pressure relief provision

4.2.1 If the valve under test incorporates a means of relieving cavity pressure as part of its standard

design and if this provision activates during the fire test, the test shall be continued and any leakage to

atmosphere from the provision shall be measured and counted as external leakage. If the design is such

that the provision vents to the downstream side of the valve, any leakage shall be counted as through-

seat leakage (see 5.6.11 and 5.6.13).

4.2.2 The test shall be stopped and considered void if the cavity pressure is exceeded which activates

the relief valve described in 5.3.2.8.

4.2.3 Double seated valves tested in compliance with a previous edition of this document where the

body cavity relief valve setting and/or cavity pressure during testing was not recorded in the original

test report shall be subjected to a supplementary test before claiming compliance with this edition.

An overpressure cavity relief test at ambient conditions shall be undertaken to demonstrate the relief

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performance mechanism of the valve with the test report appended to the original fire test report. Test

pressure shall be as specified in 5.3.2.8.
5 Fire test method
5.1 General warning

Fire testing of valves is potentially hazardous and it is essential that the safety of personnel be given

prime consideration. Given the nature of the fire test and the possibility of weaknesses in the design of

the test valve and test equipment, hazardous rupture of the pressure boundary could occur. Adequate

shields in the area of the test enclosure and other appropriate means for the protection of personnel are

necessary.

Fire testing shall be void if the product or system fails to perform within the limits specified, except

when such failure is determined to be the result of a failure within the test facility or test fixture and

that failure and its correction do not affect the validity of the test results.
5.2 Principle

A closed valve, completely filled with water under pressure, is completely enveloped in flames with

an environmental temperature in the region of the valve of 750 °C to 1 000 °C for a period of 30 min.

The objective is to completely envelop the valve in flames to assure that the seat and sealing areas

are exposed to the high burn temperature. The intensity of the heat input shall be monitored using

thermocouples and calorimeter cubes as specified in 5.6.7 and 5.6.8. During this period the internal

and external leakage is recorded. After cool-down from the fire test, the valve is hydrostatically tested

to assess the pressure containing capability of the valve shell, seats and seals.

5.3 Apparatus
5.3.1 General

The test equipment shall not subject the valve to externally applied stress affecting the results of the test.

Schematic diagrams of recommended systems for fire type-testing of valves are given in Figure 1.

Potential pipework-to-valve end connection joint leakage is not evaluated as part of the test and is not

included in the allowable external leakage (see 6.3 and 6.6). For the purposes of this test, it may be

necessary to modify these joints to eliminate leakage.

The test equipment shall be designed such that if the nominal diameter of the pipework situated

immediately upstream of the test valve is larger than DN 25 or one-half the DN of the test valve, the

pipework shall be enveloped in flames for a minimum distance of 150 mm from the test valve. The

diameter of the upstream pipework shall be sufficient to deliver a flow rate in excess of the maximum

allowable leak rate for the size of the valve being tested.

The pipework downstream of the test valve shall be at least DN 15 and shall be inclined such that the

downstream side is fully drained.

The flame source shall be at least 150 mm minimum away from the valve or any calorimeters, and

should have sufficient capacity to completely envelop the valve in flames.

The enclosure containing the valve shall provide a horizontal clearance of a minimum of 150 mm

between any part of the test valve and the enclosure, and the height of the enclosure above the top of

the test valve shall be a minimum of 150 mm.
5.3.2 Specific apparatus

5.3.2.1 Vapour trap, to minimize the cooling effect of the upstream liquid. See Figure 1 (7).

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NOTE In 5.3.2 and 5.6, the numbered items in parentheses refer to the item numbers for the apparatus in

Figure 1.

5.3.2.2 Industrial pressure measurement devices having a full-scale reading of between 1,5 and 4

times the pressure being measured. The accuracy of each test device used at any point on the scale shall

be within 3 % of its maximum scale value for readings taken both up and down the scale, with either

increasing or decreasing pressure. See Figure 1 (6, 12).

5.3.2.3 Calorimeter cubes, of carbon steel in accordance with the design and dimensions shown in

Figure 2, with a thermocouple of the accuracy specified in 5.3.2.4, located in the centre of each cube.

Calorimeter cubes shall be scale-free before exposure to the fire environment.

5.3.2.4 Flame environment and valve body thermocouples, of an accuracy at least equal to tolerance

class 2 for type B or tolerance class 3 for other types, as specified in IEC 60584-2. See Figure 1 (11).

5.3.2.5 Containers, of a size suitable for collecting the water leaked from the valve under test. See

Figure 1 (16).

5.3.2.6 Calibrated sight gauge, or device for measuring the water volume used during the test. See

Figure 1 (4).

5.3.2.7 Calibrated device for measuring the leakage water collected during the test.

5.3.2.8 Pressure relief valve, incorporated in the system, to relieve test valve cavity overpressure due

to thermal expansion of test liquid to the atmosphere, to protect against potential rupture, is required for

all double seated valves. For valves with more than one obturator, the connection shall be made into the

cavity of the upstream obturator.

The set pressure of the relief valve during the fire test and therefore the maximum allowable cavity

pressure of the valve during the test shall be:

— either that determined by the valve manufacturer from data obtained by hydrostatic cavity

overpressure testing of the test valve; proof of this required value is required prior to testing and

shall be documented within the report [see 6.7 x)]; or
— when pressure te
...

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