ISO 14903:2012
Refrigerating systems and heat pumps — Qualification of tightness of components and joints
The requirements contained in ISO 14903:2012 are applicable to joints of maximum DN 50 and components of maximum 5 l and maximum mass of 50 kg.
ISO 14903:2012 is intended to describe the qualification procedure for type approval of the tightness of components, joints and parts used in refrigerating systems and heat pumps as described in ISO 5149. It characterizes the joint tightness and stresses met when operating, following the fitting procedure specified by the manufacturer, and specifies the minimal list of necessary information to be provided by the supplier of a component to the person in charge of carrying out this procedure.
ISO 14903:2012 specifies the level of tightness of the component, as a whole, and its assembly as specified by the manufacturer.
ISO 14903:2012 applies to the hermetically sealed and closed components, joints and parts used in refrigerating installations, including those with seals, whatever their material and their design are.
ISO 14903:2012 specifies additional requirements for mechanical joints that can be recognized as hermetically sealed joints.
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Foreword
Introduction
1 Scope
2 Normative references
3 Terms and definitions
4 Symbols and units
5 Test requirements
6 Requirements for hermetically sealed systems
7 Test procedures
7.1 General
7.2 Sampling
7.3 Test temperature
7.4 Tightness test
7.5 Requirements for joints
7.6 Pressure temperature vibration tests (PTV)
7.7 Operation simulation
7.8 Freezing test
7.9 Additional pressure test for hermetically sealed joints
7.10 Vacuum test
7.11 Compatibility screening test
7.12 Fatigue test for hermetically sealed joints
8 Test report
9 Information to the user
Annex A (normative) Equivalent tightness control levels
Annex B (informative) Test arrangements
Bibliography
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Foreword
Introduction
1 Scope
2 Normative references
3 Terms and definitions
4 Symbols and units
5 Test requirements
6 Requirements for hermetically sealed systems
7 Test procedures
7.1 General
7.2 Sampling
7.3 Test temperature
7.4 Tightness test
7.5 Requirements for joints
7.6 Pressure temperature vibration tests (PTV)
7.7 Operation simulation
7.8 Freezing test
7.9 Additional pressure test for hermetically sealed joints
7.10 Vacuum test
7.11 Compatibility screening test
7.12 Fatigue test for hermetically sealed joints
8 Test report
9 Information to the user
Annex A (normative) Equivalent tightness control levels
Annex B (informative) Test arrangements
Bibliography