NF EN ISO 14903
NF EN ISO 14903

NF EN ISO 14903

January 2025
Standard Current

Refrigerating systems and heat pumps - Qualification of tightness of components and joints

This document specifies the qualification procedure for type approval of the tightness of hermetically sealed and closed components, joints and parts used in refrigerating systems and heat pumps as described in relevant parts of the ISO 5149 series, including metal flexible piping. It specifies the level of tightness of the component as a whole and its assembly as specified by the manufacturer. It specifies additional requirements for mechanical joints that can be recognized as hermetically sealed joints.This document is applicable to joints of maximum DN 50 and components of internal volume of maximum 5 l and maximum weight of 50 kg.It is applicable to the hermetically sealed and closed components, joints and parts (e.g. fittings, bursting discs, flanged or fitted assemblies) used in the refrigerating installations, including those with seals, whatever their material and design are.This document does not apply to the tightness of flexible piping made from non-metallic material. This is covered in ISO 13971.Components tested before the date of publication of this document and found to comply with ISO 14903:2017 are considered to comply with this document.

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Main informations

Collections

National standards and national normative documents

Publication date

January 2025

Number of pages

44 p.

Reference

NF EN ISO 14903

ICS Codes

27.080   Heat pumps
27.200   Refrigerating technology

Classification index

E35-424

Print number

1

International kinship

ISO 14903:2025

European kinship

EN ISO 14903:2025
Sumary
Refrigerating systems and heat pumps - Qualification of tightness of components and joints

This document specifies the qualification procedure for type approval of the tightness of hermetically sealed and closed components, joints and parts used in refrigerating systems and heat pumps as described in relevant parts of the ISO 5149 series, including metal flexible piping. It specifies the level of tightness of the component as a whole and its assembly as specified by the manufacturer. It specifies additional requirements for mechanical joints that can be recognized as hermetically sealed joints.

This document is applicable to joints of maximum DN 50 and components of internal volume of maximum 5 l and maximum weight of 50 kg.

It is applicable to the hermetically sealed and closed components, joints and parts (e.g. fittings, bursting discs, flanged or fitted assemblies) used in the refrigerating installations, including those with seals, whatever their material and design are.

This document does not apply to the tightness of flexible piping made from non-metallic material. This is covered in ISO 13971.

Components tested before the date of publication of this document and found to comply with ISO 14903:2017 are considered to comply with this document.

Replaced standards (1)
NF EN ISO 14903
NF EN ISO 14903
October 2017
Standard Cancelled
Refrigerating systems and heat pumps - Qualification of tightness of components and joints (ISO 14903:2017)

Table of contents
  • 1 Domaine d'application
  • 2 Références normatives
  • 3 Termes et définitions
  • 4 Symboles
  • 5 Exigences d'essai
  • 6 Exigences concernant les systèmes hermétiquement scellés
  • 7 Mode opératoire d'essai
  • 8 Rapport d'essai
  • 9 Information pour l'utilisateur
  • A Niveaux d'étanchéité équivalents
  • Bibliographie
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