ISO/CD 5149-2 Refrigerating systems and heat pumps - Safety and environmental requirements - Part 2: Design, construction, testing, marking and documentation

The International Organization for Standardization (ISO). This ISO document is a Draft International Standard. ISO/TC 86/SC
1. Date: 2006-04-03. This second edition cancels and replaces the first edition (ISO 5149:1993), which has been technically revised. 61p. This standard specifies the requirements for the safety of persons and property, provides guidance for the protection of the environment and establishes procedures for the operation, maintenance and repair of refrigerating systems and the recovery of refrigerants.ScopeNormative referencesDefinitionsRequirements for components and piping
General requirements
Specific requirements for particular components
Tightness
Materials
Testing
MarkingRequirements for assemblies
General
Design and construction
Testing
Marking and documentationChecklist for external visual inspection of the refrigerating systemAdditional Requirements for Refrigerating systems and heat pumps with Ammonia (NH3)
Systems with a refrigerant charge above 50 kg
Systems with a refrigerant charge above 4 500 kg
Emergency stop system for refrigerating systems with a refrigerant charge above 4500 kgDetermination of category for assemblies
General
Safety Classification of the refrigerant
Determine the maximum allowable pressure of the assembly
Determine the state (liquid or gas) of the refrigerant
Determination of category of componentsRequirements for intrinsic safety test
General
Determination of the maximum pressure during abnormal operation
Strength pressure testAdditional requirements for refrigerating systems and heat pumps using flammable refrigerants: leakage testsExamples for arrangement of pressure relief devices in refrigerating systemsAllowable equivalent length of discharge piping