BS EN 13136:2013+A1:2018
$167.15
Refrigerating systems and heat pumps. Pressure relief devices and their associated piping. Methods for calculation
| Published By | Publication Date | Number of Pages |
| BSI | 2018 | 38 |
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.
PDF Catalog
| PDF Pages | PDF Title |
|---|---|
| 2 | undefined |
| 8 | 1 Scope 2 Normative references |
| 9 | 3 Terms and definitions 4 Symbols |
| 11 | 5 General |
| 12 | 6 Pressure relief devices for protection of system components 6.1 General 6.2 Excessive pressure caused by heat sources 6.2.1 External heat sources |
| 13 | 6.2.2 Internal heat sources |
| 14 | 6.3 Excessive pressure caused by compressors 6.4 Excessive pressure caused by liquid expansion 7 Discharge capacities of pressure relief devices 7.1 General |
| 15 | 7.2 Determination of pressure relief valve performance 7.2.1 Determination of coefficient of discharge 7.2.2 Critical and sub-critical flow 7.2.3 Function of the isentropic exponent (C) 7.2.4 Correction factor for sub-critical flow |
| 16 | 7.2.5 Discharge capacity of pressure relief valves 7.2.5.1 General 7.2.5.2 Calculation of the mass flow 7.3 Calculation of capacity and flow area of bursting discs or fusible plugs |
| 17 | 7.4 Pressure loss in upstream/downstream lines 7.4.1 General 7.4.2 Pressure loss in components |
| 18 | 7.4.3 Pressure loss in the upsteam line 7.4.4 Pressure loss in the downstream line |
| 19 | Annex A (normative)Values of functions, factors and properties of refrigerants |
| 28 | Annex B (informative)Calculation of flow areas for non-evaporating and evaporating liquids B.1 Calculation of the flow area for non-evaporating liquids B.2 Calculation of the flow area for evaporating liquids |
| 30 | Annex C (informative)Example of calculation for sizing pressure relief devices with the corresponding pipes |
| 31 | C.1 Assumptions for the calculation example C.2 Calculation of the required minimum discharge capacity, Qmd at standard heat flow rate |
| 32 | C.3 Calculation of the required minimum discharge capacity Qmd at reduced heat flow rate C.4 Calculation of flow area Ac, selection of pressure relief valve |
| 33 | C.5 Pressure loss in upstream line (from vessel to pressure relief valve) |
| 34 | C.6 Pressure loss in downstream line (from pressure relief valve to atmosphere) |
| 36 | Annex ZA (informative)Relationship between this European Standard and the essential requirements of Directive 2014/68/EU (Pressure equipment Directive) aimed to be covered |
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