1.1 This European Standard describes the calculation of mass flow for sizing pressure relief devices for components of refrigerating systems. NOTE The term "refrigerating system" used in this European Standard includes heat pumps. 1.2 This European Standard describes the calculation of discharge capacities for pressure relief valves and other pressure relief devices in refrigerating systems including the necessary data for sizing these when relieving to atmosphere or to components within the system at lower pressure. 1.3 This European Standard specifies the requirements for selection of pressure relief devices to prevent excessive pressure due to internal and external heat sources, the sources of increasing pressure (e.g. compressor, heaters, etc.) and thermal expansion of trapped liquid. 1.4 This European Standard describes the calculation of the pressure loss in the upstream and downstream line of pressure relief valves and other pressure relief devices and includes the necessary data. 1.5 This European Standard refers to other relevant standards in Clause 5.
Tämän julkaisun valmistelusta Suomessa vastaa Metalliteollisuuden Standardisointiyhdistys ry, puh. 09 19 231 (vaihde).
EN 12284:2003 Refrigerating systems and heat pumps - Valves - Requirements, testing and marking
EN 378-1:2008+A2:2012 Refrigerating systems and heat pumps - Safety and environmental requirements - Part 1: Basic requirements, definitions, classification and selection criteria
EN 378-2:2008+A2:2012 Refrigerating systems and heat pumps - Safety and environmental requirements - Part 2: Design, construction, testing, marking and documentation
EN 12284:2003 Refrigerating systems and heat pumps - Valves - Requirements, testing and marking
EN 378-1:2008+A2:2012 Refrigerating systems and heat pumps - Safety and environmental requirements - Part 1: Basic requirements, definitions, classification and selection criteria
EN 378-2:2008+A2:2012 Refrigerating systems and heat pumps - Safety and environmental requirements - Part 2: Design, construction, testing, marking and documentation
EN 764-1:2004 Pressure equipment - Part 1: Terminology - Pressure, temperature, volume, nominal size
EN 764-2:2012 Pressure equipment - Part 2: Quantities, symbols and units
EN ISO 4126-1:2013 Safety devices for protection against excessive pressure - Part 1: Safety valves (ISO 4126-1:2013)
EN ISO 4126-2:2003 Safety devices for protection against excessive pressure - Part 2: Bursting disc safety devices (ISO 4126-2:2003)
ISO 817:2014 Refrigerants -- Designation and safety classification