NF EN ISO 24664

NF EN ISO 24664

December 2024
Standard Current

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

This document describes the calculation of:—     mass flow for sizing pressure relief devices for parts of refrigerating systems;—     discharge capacities for pressure relief valves and other pressure relief devices in refrigerating systems including the necessary data for sizing these when relieving to atmosphere or to part of the refrigerating system at lower pressure;—     the pressure loss in the inlet and outlet lines of pressure relief valves and other pressure relief devices and includes the necessary data.This document specifies the requirements for selection of pressure relief devices to prevent excessive pressure due to internal and external heat sources, the sources of increasing pressure (e.g. compressor, heaters, etc.) and thermal expansion of trapped liquid.NOTE            The term "refrigerating system" used in this document includes heat pumps.

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Main informations

Collections

National standards and national normative documents

Publication date

December 2024

Number of pages

50 p.

Reference

NF EN ISO 24664

ICS Codes

27.080   Heat pumps
27.200   Refrigerating technology

Classification index

E35-413

Print number

1

International kinship

ISO 24664:2024

European kinship

EN ISO 24664:2024
Sumary
Refrigerating systems and heat pumps - Pressure relief devices and their associated piping - Methods for calculation

This document describes the calculation of:

—     mass flow for sizing pressure relief devices for parts of refrigerating systems;

—     discharge capacities for pressure relief valves and other pressure relief devices in refrigerating systems including the necessary data for sizing these when relieving to atmosphere or to part of the refrigerating system at lower pressure;

—     the pressure loss in the inlet and outlet lines of pressure relief valves and other pressure relief devices and includes the necessary data.

This document specifies the requirements for selection of pressure relief devices to prevent excessive pressure due to internal and external heat sources, the sources of increasing pressure (e.g. compressor, heaters, etc.) and thermal expansion of trapped liquid.

NOTE            The term "refrigerating system" used in this document includes heat pumps.

Replaced standards (1)
NF EN 13136+A1
November 2018
Standard Cancelled
Refrigerating systems and heat pumps - Pressure relief devices and their associated piping - Method for calculation

Le présent document décrit les différentes méthodes de calcul permettant le dimensionnement des dispositifs de limitation de pression destinés à être utilisés sur les composants de systèmes frigorifiques. Il fournit également les valeurs des fonctions et facteurs nécessaires aux calculs en fonction du fluide frigorigène utilisé. Le présent document donne présomption de conformité à la Directive 2014/68/UE "Équipement sous pression" sous réserve que sa référence soit citée au Journal officiel de l'Union européenne.

Table of contents
  • 1 Domaine d'application
  • 2 Références normatives
  • 3 Termes et définitions
  • 4 Symboles
  • 5 Généralités
  • 6 Capacité minimale de décharge requise pour la protection des parties d'un système de réfrigération
  • 7 Capacités de décharge des dispositifs de limitation de pression
  • 8 Perte de charge dans les tubulures en amont et en aval
  • A Valeurs des facteurs et propriétés des fluides frigorigènes
  • B Calcul des sections de passage pour les fluides non évaporatifs et évaporatifs
  • C Exemple de calcul pour dimensionner des dispositifs de limitation de pression avec tuyauteries et raccords associés
  • D Tubulure en aval de la soupape de sécurité lorsque la vitesse est supérieure à la vitesse du son
  • ZA Relation entre la présente Norme européenne et les exigences essentielles concernées de la Directive 2014/68/UE (Directive Équipements sous pression)
  • Bibliographie
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