NF EN ISO 14903, E35-424 (01/2025)

ISO 14903:2017 provides qualification procedures for type testing of the tightness of hermetically sealed and closed components, joints and elements used in refrigeration systems and heat pumps as described in the relevant parts of ISO 5149 . Sealed or closed components, joints and elements include fittings, rupture or bursting discs, flanged or fitting assemblies. The sealing of hoses made of non-metallic materials is covered in ISO 13971. Metallic hoses are covered by this document. The requirements of this document apply to seals of maximum DN 50 and to components of maximum 5 l and maximum weight of 50 kg. ISO 14903:2017 is intended to characterize their tightness, the constraints encountered during their operation, following the assembly procedure specified by the manufacturer and to specify the minimum list of information necessary to be provided by the supplier of a component to the person responsible to implement this procedure. It specifies the level of sealing of the component, as a whole, as well as its assembly as specified by its manufacturer. It is applicable to hermetically sealed and closed components, joints and elements used in refrigeration installations, including those with seals, regardless of their material and design. ISO 14903:2017 specifies additional requirements for mechanical joints that may be considered hermetically sealed joints.
(Automatic translation from French)