UNE-EN ISO 14903:2018

This International Standard is intended to describe the qualification procedure for type approval of thetightness of hermetically sealed and closed components, joints and parts used in refrigerating systems andheat pumps as described in ISO 5149. The sealed and closed components, joints and parts concerned are, inparticular, fittings, bursting discs, flanged or fitted assemblies. The tightness of flexible piping made from nonmetallicmaterials is dealt with in ISO 13971. Metal flexible piping are covered by this standard.The requirements contained in this document are applicable to joints of maximum DN 50 and components ofinternal volume of maximum 5 l and maximum weight of 50 kg.This document is intended to characterise their tightness stresses met during their operations, following thefitting procedure specified by the manufacturer, and to specify the minimal list of necessary information to beprovided by the supplier of a component to the person in charge of carrying out this procedure.It specifies the level of tightness of the component, as a whole, and its assembly as specified by itsmanufacturer.It applies to the hermetically sealed and closed components, joints and parts used in the refrigeratinginstallations, including those with seals, whatever their material and their design are.This International Standard specifies additional requirements for mechanical joints that can be recognised ashermetically sealed joints.