Industrial valves — Design validation-testing of valves

This document specifies requirements and acceptance criteria for type testing, in compliance with design conditions, of metallic butterfly and ball valves used for isolating services for all industrial applications, and serves to validate the product design over 205 cycles. This document excludes testing for safety devices, control valves, thermoplastics valves, and valves for water supply for human consumption and sewage (e.g. the EN 1074 series). This document defines the procedure for extending the qualification of the tested valve to untested sizes and pressure designations of the same product range. The purpose of this type test is to validate the seat performance within manufacturer given pressure/temperature rating, provided by the manufacturer’s technical documentation of the product. This type test verifies torque requirements and the maximum allowable stem torque (MAST), as given in the manufacturer's technical documentation. This type test validates the durability of seat performance and operating torque through mechanical and thermal cycles.

Robinetterie industrielle - Essais de validation de la conception des appareils de robinetterie

General Information

Status
Published
Publication Date
10-May-2021
Technical Committee
Drafting Committee
Current Stage
6060 - International Standard published
Start Date
11-May-2021
Completion Date
11-May-2021
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INTERNATIONAL ISO
STANDARD 23632
First edition
2021-05
Industrial valves — Design validation-
testing of valves
Robinetterie industrielle - Essais de validation de la conception des
appareils de robinetterie
Reference number
ISO 23632:2021(E)
ISO 2021
---------------------- Page: 1 ----------------------
ISO 23632:2021(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 23632:2021(E)
Contents Page

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

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

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

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

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

4 Type test ........................................................................................................................................................................................................................ 3

4.1 Test condition ........................................................................................................................................................................................... 3

4.1.1 General...................................................................................................................................................................................... 3

4.1.2 Closure test ........................................................................................................................................................................... 3

4.1.3 Torque measurement ................................................................................................................................................... 4

4.1.4 Temperature measurement .................................................................................................................................... 4

4.1.5 Test facility and safety rules ................................................................................................................................... 6

4.1.6 Mechanical-cycle classes ........................................................................................................................................... 6

4.2 Test description ...................................................................................................................................................................................... 7

4.2.1 General...................................................................................................................................................................................... 7

4.2.2 Test temperatures ........................................................................................................................................................... 7

4.2.3 Closure test ........................................................................................................................................................................... 8

4.2.4 Unseating torque ............................................................................................................................................................. 8

4.2.5 Maximum allowable stem torque (MAST) ................................................................................................. 8

4.2.6 Post-test examination .................................................................................................................................................. 8

4.2.7 Qualification ......................................................................................................................................................................... 8

4.3 Test report ................................................................................................................................................................................................... 9

5 Extensions of qualification to the product range................................................................................................................ 9

Annex A (informative) Report template .........................................................................................................................................................12

Bibliography .............................................................................................................................................................................................................................14

© ISO 2021 – All rights reserved iii
---------------------- Page: 3 ----------------------
ISO 23632:2021(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 153, Valves.

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
---------------------- Page: 4 ----------------------
ISO 23632:2021(E)
Introduction
The scope of this document is currently limited to ball and butterfly valves.

The objective of this document is to outline the requirements and methods for evaluating the

performance of metallic industrial valves with respect to seat performance and operating torque

capability. Fugitive emission performance was omitted, as it is covered by ISO 15848-1. The number

of cycles (205) is consistent with the number in C01 of ISO 15848-1:2015. It serves to test the accuracy

and dependability of the measurements and capabilities of a valve as published by the manufacturer in

the valve’s technical documentation.

Type validation is the most reliable method to validate a range of valve products, covering many

aspects, such as its design, material selection and manufacturing processes. It will also serve as a guide

for valve selection, allowing customers to compare different valve types, designs and brands.

Several major customers already require type tests, each having their own requirements and

specifications. Introducing a defined International Standard will reduce manufacturer's costs by

decreasing the number of qualifications, as well as decreasing end-user total cost-of-ownership, by

eliminating the possibility of unintentional design flaws.

This validation will improve performance and safety in the plants by enabling any customer to specify

durable type-tested industrial valves.
© ISO 2021 – All rights reserved v
---------------------- Page: 5 ----------------------
INTERNATIONAL STANDARD ISO 23632:2021(E)
Industrial valves — Design validation-testing of valves
1 Scope

This document specifies requirements and acceptance criteria for type testing, in compliance with

design conditions, of metallic butterfly and ball valves used for isolating services for all industrial

applications, and serves to validate the product design over 205 cycles.

This document excludes testing for safety devices, control valves, thermoplastics valves, and valves for

water supply for human consumption and sewage (e.g. the EN 1074 series).

This document defines the procedure for extending the qualification of the tested valve to untested

sizes and pressure designations of the same product range.

The purpose of this type test is to validate the seat performance within manufacturer given pressure/

temperature rating, provided by the manufacturer’s technical documentation of the product. This type

test verifies torque requirements and the maximum allowable stem torque (MAST), as given in the

manufacturer's technical documentation. This type test validates the durability of seat performance

and operating torque through mechanical and thermal cycles.
2 Normative references

The following documents are referred to in the text in such a way that some or all their content

constitutes requirements of this document. For dated references, only the edition cited applies. For

undated references, the latest edition of the referenced document (including any amendments) applies.

ISO 5208, Industrial valves — Pressure testing of metallic valves

ISO 15848-1, Industrial valves — Measurement, test and qualification procedures for fugitive emissions —

Part 1: Classification system and qualification procedures for type testing of valves

3 Terms and definitions

For the purposes of this document, the terms and definitions given in ISO 5208 and ISO 15848-1 and the

following apply.

ISO and IEC maintain terminological databases for use in standardization at the following addresses:

— ISO Online browsing platform: available at https:// www. iso. org/o bp
— IEC Electropedia: available at http:// www.e lectropedia. org/
3.1
asymmetric sealed valve

valve with an internal construction, which does not have 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 not identical.

3.2
bidirectional valve
valve designed for blocking the flow in both downstream and upstream directions
© ISO 2021 – All rights reserved 1
---------------------- Page: 6 ----------------------
ISO 23632:2021(E)
3.3
maximum allowable stem torque
MAST

maximum torque that can be applied to a valve stem or shaft without causing permanent deformation or

mechanical damage to the stem or any other components of the valve that prevent sealing or operation

3.4
minimum allowable temperature
minimum temperature for which the valve is designed
3.5
obturator

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

the fluid flow
3.6
operating mechanism

mechanism which translates the motion of the manual- or power-operated device to the motion of the

obturator (3.5)
3.7
post-test examination
disassembly, inspection and examination after completion of all the tests
3.8
qualified facility
independent test facility accredited and certified to perform valve type testing
3.9
room temperature
temperature in the range of +5 °C to +40 °C
3.10
seating torque

torque applied to the shaft to move the obturator (3.5) into contact with the seat immediately prior to

the closure test
3.11
seat performance
closure test over a range of mechanical, pressure and temperature cycles
3.12
symmetric sealed 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.

3.13
torque measurement

measurement of seating (3.10) and unseating torques (3.14) using calibrated measuring equipment

3.14
unseating torque
torque applied to open the valve against the maximum differential pressure
3.15
design validation testing

protocol where valves are type tested at the maximum rated pressures and design temperature ranges

as specified by the manufacturer
2 © ISO 2021 – All rights reserved
---------------------- Page: 7 ----------------------
ISO 23632:2021(E)
3.16
unidirectional valve

valve designed for blocking the flow in either downstream or upstream direction only

4 Type test
4.1 Test condition
4.1.1 General

The valve manufacturer shall issue a declaration of conformity that the valve to be tested is

representative of the products that are being shipped to customers and is not specially prepared for

this test. The valve to be tested may be externally coated or painted.

This declaration of conformity shall state that the valve components and the assembled valve have

undergone all the manufacturing, assembly and hydrostatic shell test steps of the typical quality control

plan provided by the manufacturer.

The allowable seat leakage rates, according to ISO 5208, shall be specified by the valve manufacturer

before the start of the type test.

The test equipment shall be appropriately selected to assure it adheres to the specific type test

operating conditions. This equipment should also be in accordance with the applicable health, safety

and environmental management system.

All measuring instruments shall be calibrated and shall be within their period of validity at the date of

testing.
4.1.2 Closure test

Pressure test for the purpose of validating leakage through a valve’s closure mechanism shall be

measured with dry air or other suitable gas using the mandatory closure test procedure given in

ISO 5208 per the applicable product standard. Over 5 MPa (50 bars), self-ignition risks shall be

considered when testing with dry air.

For a closure test performed at high or low temperature, the temperature of the exiting test gas shall be

measured (before the flowmeter) and verified to be within the calibration range of the flowmeter. For

volume flow measurement it is required to correct that measurement for the effect of temperature, or

to bring the temperature of the exiting test gas within room temperature.

The perfect gas relationship assuming constant pressure shall be used to determine the equivalent flow

rate at room temperature. See ISO 28921-1 for the detailed calculation.
QT×
Q = (1)
where
T is the test gas temperature entering the flowmeter, in Kelvin (K);
T is 298 K, the standard ambient temperature, in Kelvin (K);

Q is the test gas flow exiting the flowmeter, in cubic millimetres per second (mm /s);

Q is the corrected test gas flow exiting the flowmeter at room temperature, in cubic millimetres

per second (mm /s).
© ISO 2021 – All rights reserved 3
---------------------- Page: 8 ----------------------
ISO 23632:2021(E)

Electronic mass flowmeters are not affected by pressure or temperature changes. When such flowmeter

is used, test gas pressure and temperature measurements (as well as correction) at the flowmeter is not

required.

For a closure test performed at high temperature, the test pressure shall be 1,1 × the maximum rated

pressure at high temperature.
4.1.3 Torque measurement

Torque shall be measured by means of a calibrated torque wrench with maximum torque indicator,

strain gauge sensor or other appropriate means. Torque measurement equipment shall have a tolerance

accuracy lower than or equal to 5 % at the maximum torque measured.
4.1.4 Temperature measurement

The temperature of the test valve shall be measured at the following three locations, as shown in

Figure 1 and recorded in a test report.
a) Measurement at location 1 sha
...

FINAL
INTERNATIONAL ISO/FDIS
DRAFT
STANDARD 23632
ISO/TC 153
Industrial valves — Design validation-
Secretariat: AFNOR
testing of valves
Voting begins on:
2021­02­03
Robinetterie industrielle - Essais de validation de la conception des
appareils de robinetterie
Voting terminates on:
2021­03­31
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 23632:2021(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 23632:2021(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
CH­1214 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 23632:2021(E)
Contents Page

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

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

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

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

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

4 Type test ........................................................................................................................................................................................................................ 3

4.1 Test condition ........................................................................................................................................................................................... 3

4.1.1 General...................................................................................................................................................................................... 3

4.1.2 Closure test ........................................................................................................................................................................... 3

4.1.3 Torque measurement ................................................................................................................................................... 4

4.1.4 Temperature measurement .................................................................................................................................... 4

4.1.5 Test facility and safety rules ................................................................................................................................... 6

4.1.6 Mechanical-cycle classes ........................................................................................................................................... 6

4.2 Test description ...................................................................................................................................................................................... 7

4.2.1 General...................................................................................................................................................................................... 7

4.2.2 Test temperatures ........................................................................................................................................................... 7

4.2.3 Closure test ........................................................................................................................................................................... 8

4.2.4 Unseating torque ............................................................................................................................................................. 8

4.2.5 Maximum allowable stem torque (MAST) ................................................................................................. 8

4.2.6 Post-test examination .................................................................................................................................................. 8

4.2.7 Qualification ......................................................................................................................................................................... 8

4.3 Test report ................................................................................................................................................................................................... 9

5 Extensions of qualification to the product range................................................................................................................ 9

Annex A (informative) Report template .........................................................................................................................................................12

Bibliography .............................................................................................................................................................................................................................14

© ISO 2021 – All rights reserved iii
---------------------- Page: 3 ----------------------
ISO/FDIS 23632:2021(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 non­governmental, 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.

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
---------------------- Page: 4 ----------------------
ISO/FDIS 23632:2021(E)
Introduction
The scope of this document is currently limited to ball and butterfly valves.

The objective of this document is to outline the requirements and methods for evaluating the

performance of metallic industrial valves with respect to seat performance and operating torque

capability. Fugitive emission performance was omitted, as it is covered by ISO 15848-1. The number

of cycles (205) is consistent with the number in C01 of ISO 15848-1:2015. It serves to test the accuracy

and dependability of the measurements and capabilities of a valve as published by the manufacturer in

the valve’s technical documentation.

Type validation is the most reliable method to validate a range of valve products, covering many

aspects, such as its design, material selection and manufacturing processes. It will also serve as a guide

for valve selection, allowing customers to compare different valve types, designs and brands.

Several major customers already require type tests, each having their own requirements and

specifications. Introducing a defined International Standard will reduce manufacturer's costs by

decreasing the number of qualifications, as well as decreasing end-user total cost-of-ownership, by

eliminating the possibility of unintentional design flaws.

This validation will improve performance and safety in the plants by enabling any customer to specify

durable type-tested industrial valves.
© ISO 2021 – All rights reserved v
---------------------- Page: 5 ----------------------
FINAL DRAFT INTERNATIONAL STANDARD ISO/FDIS 23632:2021(E)
Industrial valves — Design validation-testing of valves
1 Scope

This document specifies requirements and acceptance criteria for type testing, in compliance with

design conditions, of metallic butterfly and ball valves used for isolating services for all industrial

applications, and serves to validate the product design over 205 cycles.

This document excludes testing for safety devices, control valves, thermoplastics valves and valves for

water supply for human consumption (e.g. EN 1074-1 and EN 1074-2).

This document defines the procedure for extending the qualification of the tested valve to untested

sizes and pressure designations of the same product range.

The purpose of this type test is to validate the seat performance within manufacturer given pressure/

temperature rating, provided by the manufacturer’s technical documentation of the product. This type

test verifies torque requirements and the maximum allowable stem torque (MAST), as given in the

manufacturer's technical documentation. This type test validates the durability of seat performance

and operating torque through mechanical and thermal cycles.
2 Normative references

The following documents are referred to in the text in such a way that some or all their content

constitutes requirements of this document. For dated references, only the edition cited applies. For

undated references, the latest edition of the referenced document (including any amendments) applies.

ISO 5208, Industrial valves — Pressure testing of metallic valves

ISO 15848­1, Industrial valves — Measurement, test and qualification procedures for fugitive emissions —

Part 1: Classification system and qualification procedures for type testing of valves

3 Terms and definitions

For the purposes of this document, the terms and definitions given in ISO 5208 and ISO 15848-1 and the

following apply.

ISO and IEC maintain terminological databases for use in standardization at the following addresses:

— ISO Online browsing platform: available at https:// www .iso .org/ obp
— IEC Electropedia: available at http:// www .electropedia .org/
3.1
asymmetric sealed valve

valve with an internal construction, which does not have 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 not identical.

3.2
bidirectional valve
valve designed for blocking the flow in both downstream and upstream directions
© ISO 2021 – All rights reserved 1
---------------------- Page: 6 ----------------------
ISO/FDIS 23632:2021(E)
3.3
maximum allowable stem torque
MAST

maximum torque that can be applied to a valve stem or shaft without causing permanent deformation or

mechanical damage to the stem or any other components of the valve that prevent sealing or operation

3.4
minimum allowable temperature
minimum temperature for which the valve is designed
3.5
obturator

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

the fluid flow
3.6
operating mechanism

mechanism which translates the motion of the manual­ or power­operated device to the motion of the

obturator (3.5)
3.7
post-test examination
disassembly, inspection and examination after completion of all the tests
3.8
qualified facility
independent test facility accredited and certified to perform valve type testing
3.9
room temperature
temperature in the range of +5 °C to +40 °C
3.10
seating torque

torque applied to the shaft to move the obturator (3.5) into contact with the seat immediately prior to

the closure test
3.11
seat performance
closure test over a range of mechanical, pressure and temperature cycles
3.12
symmetric sealed 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.

3.13
torque measurement

measurement of seating (3.10) and unseating torques (3.14) using calibrated measuring equipment

3.14
unseating torque
torque applied to open the valve against the maximum differential pressure
3.15
design validation testing

protocol where valves are type tested at the maximum rated pressures and design temperature ranges

as specified by the manufacturer
2 © ISO 2021 – All rights reserved
---------------------- Page: 7 ----------------------
ISO/FDIS 23632:2021(E)
3.16
unidirectional valve

valve designed for blocking the flow in either downstream or upstream direction only

4 Type test
4.1 Test condition
4.1.1 General

The valve manufacturer shall issue a declaration of conformity that the valve to be tested is

representative of the products that are being shipped to customers and is not specially prepared for

this test. The valve to be tested may be externally coated or painted.

This declaration of conformity shall state that the valve components and the assembled valve have

undergone all the manufacturing, assembly and hydrostatic shell test steps of the typical quality control

plan provided by the manufacturer.

The allowable seat leakage rate, according to ISO 5208, shall be specified by the valve manufacturer

before the start of the type test.

The test equipment shall be appropriately selected to assure it adheres to the specific type test

operating conditions. This equipment should also be in accordance with the applicable health, safety

and environmental management system.

All measuring instruments shall be calibrated and shall be within their period of validity at the date of

testing.
4.1.2 Closure test

Pressure test for the purpose of validating leakage through a valve’s closure mechanism shall be

measured with dry air or other suitable gas using the mandatory closure test procedure given in

ISO 5208 per the applicable product standard. Over 5 MPa (50 bars), self­ignition risks shall be

considered when testing with dry air.

For closure test performed at high or low temperature, the temperature of the exiting test gas shall be

measured (before the flowmeter) and verified to be within the calibration range of the flowmeter. For

volume flow measurement it is required to correct that measurement for the effect of temperature, or

to bring the temperature of the exiting test gas within room temperature.

The perfect gas relationship assuming constant pressure shall be used to determine the equivalent flow

rate at room temperature. See ISO 28921­1 for the detailed calculation.
QT×
Q = (1)
where
T is the test gas temperature entering the flowmeter, in Kelvin (K);
T is 298 °K, the standard ambient temperature, in Kelvin (K);

Q is the test gas flow exiting the flowmeter, in cubic millimetres per second (mm /s);

Q is the corrected test gas flow exiting the flowmeter at room temperature, in cubic millimetres

per second (mm /s).
© ISO 2021 – All rights reserved 3
---------------------- Page: 8 ----------------------
ISO/FDIS 23632:2021(E)

Electronic mass flowmeters are not affected by pressure or temperature changes. When such flowmeter

is used, test gas pressure and temperature measurements (as well as correction) at the flowmeter is not

required.

For closure test performed at high temperature, the test pressure shall be 1,1 × the maximum rated

pressure at high temperature.
4.1.3 Torque measurement

Torque shall be measured by means of a calibrated torque wrench with maximum torque indicat

...

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