ISO/FDIS 24664

Refrigerating systems and heat pumps — Pressure relief devices and their associated piping — Methods for calculation

Systèmes de réfrigération et pompes à chaleur — Dispositifs de limitation de pression et tuyauteries associées — Méthodes de calcul

General Information

• Status: Not Published
• ICS: 27.080 - Heat pumps
• ICS: 27.200 - Refrigerating technology
• Technical Committee: ISO/TC 86/SC 1 - Safety and environmental requirements for refrigerating systems
• Drafting Committee: ISO/TC 86/SC 1 - Safety and environmental requirements for refrigerating systems
• Current Stage: 5020 - FDIS ballot initiated: 2 months. Proof sent to secretariat
• Start Date: 21-Jun-2024
• Completion Date: 21-Jun-2024

Relations

• Consolidates: ISO 6721-7:2019 - Plastics — Determination of dynamic mechanical properties — Part 7: Torsional vibration — Non-resonance method
• Effective Date: 06-Jun-2022

Standards Content (Sample)

FINAL DRAFT
International
Standard
ISO/FDIS 24664
ISO/TC 86/SC 1
Refrigerating systems and heat
Secretariat: ANSI
pumps — Pressure relief devices
Voting begins on:
and their associated piping —
2024-06-21
Methods for calculation
Voting terminates on:
2024-08-16
Systèmes de réfrigération et pompes à chaleur — Dispositifs de
limitation de pression et tuyauteries associées — Méthodes de
calcul
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
BEING ACCEPTABLE FOR INDUSTRIAL, TECHNO­
ISO/CEN PARALLEL PROCESSING 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.
Reference number
ISO/FDIS 24664:2024(en) © ISO 2024

---------------------- Page: 1 ----------------------
FINAL DRAFT
ISO/FDIS 24664:2024(en)
International
Standard
ISO/FDIS 24664
ISO/TC 86/SC 1
Refrigerating systems and heat
Secretariat: ANSI
pumps — Pressure relief devices
Voting begins on:
and their associated piping —
2024-06-21
Methods for calculation
Systèmes de réfrigération et pompes à chaleur — Dispositifs de
Voting terminates on:
limitation de pression et tuyauteries associées — Méthodes de
calcul
2024-08-16
RECIPIENTS OF THIS DRAFT ARE INVITED TO SUBMIT,
COPYRIGHT PROTECTED DOCUMENT
WITH THEIR COMMENTS, NOTIFICATION OF ANY
RELEVANT PATENT RIGHTS OF WHICH THEY ARE AWARE
AND TO PROVIDE SUPPOR TING DOCUMENTATION.
© ISO 2024
IN ADDITION TO THEIR EVALUATION AS
All rights reserved. Unless otherwise specified, or required in the context of its implementation, no part of this publication may
BEING ACCEPTABLE FOR INDUSTRIAL, TECHNO­
ISO/CEN PARALLEL PROCESSING
LOGICAL, COMMERCIAL AND USER PURPOSES, DRAFT
be reproduced or utilized otherwise in any form or by any means, electronic or mechanical, including photocopying, or posting on
INTERNATIONAL STANDARDS MAY ON OCCASION HAVE
the internet or an intranet, without prior written permission. Permission can be requested from either ISO at the address below
TO BE CONSIDERED IN THE LIGHT OF THEIR POTENTIAL
or ISO’s member body in the country of the requester.
TO BECOME STAN DARDS TO WHICH REFERENCE MAY BE
MADE IN NATIONAL REGULATIONS.
ISO copyright office
CP 401 • Ch. de Blandonnet 8
CH-1214 Vernier, Geneva
Phone: [phone]
Email: [e-mail]
Website: www.iso.org
Published in Switzerland Reference number
ISO/FDIS 24664:2024(en) © ISO 2024

© ISO 2024 – All rights reserved
ii

---------------------- Page: 2 ----------------------
ISO/FDIS 24664:2024(en)
Contents Page
Foreword .iv
Introduction .v
1 Scope . 1
2 Normative references . 1
3 Terms and definitions . 1
4 Symbols . 3
5 General . 4
6 Minimum required discharge capacity for protection of parts of a refrigerating system . 5
6.1 General .5
6.2 Excessive pressure caused by heat sources.6
6.2.1 Ex
...

ISO/TC 86
Date: 2021-01-042024-05-16
ISO/DISFDIS 24664:2024(E)
ISO/TC 86
Secretariat: ANSI
Refrigerating systems and heat pumps — Pressure relief devices and their associated
piping — Methods for calculation
Kälteanlagen und Wärmepumpen — Druckentlastungseinrichtungen und zugehörige
Leitungen — Berechnungsverfahren
Systèmes de réfrigeration et pompes à chaleur — Dispositifs de surpression et tuyauteries
associèes — Méthodes de calcul
ICS:
Descriptors:














Document type:
Document subtype:
Document stage:  Formal vote

Document language:

---------------------- Page: 1 ----------------------
ISO/FDIS 24664:2024(E)
© ISO 2024
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-1214 Vernier, Geneva
Phone: + 41 22 749 01 11
Email: [e-mail]
Website: www.iso.org
Published in Switzerland.
ii © ISO 2024 – All rights reserved

---------------------- Page: 2 ----------------------
ISO/FDIS 24664:2024(E)
Contents Page
Foreword . 5 Field Code Changed
Introduction . 6 Field Code Changed
1 Scope . 8
2 Normative references . 8
3 Terms and definitions . 8
4 Symbols . 10
5 General . 12
6 Minimum required discharge capacity for protection of parts of a refrigerating
system . 13
6.1 General . 13
6.2 Excessive pressure caused by heat sources . 14
6.2.1 External heat sources . 14
6.2.2 Internal heat sources . 15
6.3 Excessive pressure caused by compressors . 15
6.4 Excessive pressure caused by expansion of trapped liquid . 16
7 Discharge capacity of pressure relief devices . 16
7.1 General . 16
7.2 Discharge capacity of pressure relief valves . 17
7.3 Discharge capacity of bursting discs . 18
8 Pressure loss in inlet and outlet lines . 18
8.1 General . 18
8.2 Pressure loss in inlet line . 19
8.3 Pressure loss in outlet line . 20
8.4 Total press
...