EN 13136:2013
(Main)Refrigerating systems and heat pumps - Pressure relief devices and their associated piping - Methods for calculation
Refrigerating systems and heat pumps - Pressure relief devices and their associated piping - Methods for calculation
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.
Kälteanlagen und Wärmepumpen - Druckentlastungseinrichtungen und zugehörige Leitungen - Berechnungsverfahren
1.1 Diese Europäische Norm beschreibt die Berechnung der Massenströme zur Größenbestimmung von Druckentlastungseinrichtungen für Teile von Kälteanlagen.
ANMERKUNG Der in dieser Europäischen Norm verwendete Begriff „Kälteanlage“ schließt Wärmepumpen mit ein.
1.2 Diese Europäische Norm beschreibt die Berechnung der Abblaseleistungen von Druckentlastungsventilen und anderen Druckentlastungseinrichtungen in Kälteanlagen einschließlich der hierzu erforderlichen Daten zur Größenbestimmung dieser Einrichtungen, wenn sie ins Freie oder in Bauteile der Kälteanlage mit niedrigerem Druck abblasen.
1.3 Diese Europäische Norm legt die Anforderungen an die Auswahl von Druckentlastungseinrichtungen zur Vermeidung von unzulässigen Drücken, hervorgerufen durch innere und äußere Wärmequellen, Druckerzeuger (z. B. Verdichter, Erhitzer, usw.) und die Wärmeausdehnung eingesperrter Flüssigkeit fest.
1.4 Diese Europäische Norm beschreibt die Berechnung des Druckabfalls in den zu- und abführenden Leitungen von Druckentlastungsventilen und anderen Druckentlastungseinrichtungen einschließlich der erforderlichen Daten.
1.5 Diese Europäische Norm verweist in Abschnitt 5 auf weitere einschlägige Normen.
Systèmes frigorifiques et pompes à chaleur - Dispositifs de limitation de pression et tuyauteries associées - Méthodes de calcul
1.1 La présente Norme européenne décrit le calcul du débit-masse pour le dimensionnement des dispositifs de limitation de pression pour les composants des systèmes frigorifiques.
NOTE Le terme « système frigorifique » utilisé dans la présente Norme européenne inclut les pompes à chaleur.
1.2 La présente Norme européenne décrit le calcul des capacités de décharge des soupapes de sûreté et autres dispositifs de limitation de pression des systèmes frigorifique, y compris les données nécessaires à leur dimensionnement lors de leur décharge dans l’atmosphère ou dans les composants du système à basse pression.
1.3 La présente Norme européenne spécifie les exigences relatives à la sélection des dispositifs de limitation de pression pour éviter une pression excessive due aux sources de chaleur internes et externes, aux autres sources de génération de pression (par exemple compresseurs, chauffages, etc.) et à la dilatation du fluide piégé.
1.4 La présente Norme européenne décrit le calcul de la perte de charge dans la tubulure en amont et en aval des soupapes de sûreté et autres dispositifs de limitation de pression, et inclut les données nécessaires.
1.5 La présente Norme européenne renvoie à d’autres normes pertinentes à l’Article 5.
Hladilni sistemi in toplotne črpalke - Tlačne varnostne naprave in njihove napeljave - Metode za izračun
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Standards Content (Sample)
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.Kälteanlagen und Wärmepumpen - Druckentlastungseinrichtungen und zugehörige Leitungen - BerechnungsverfahrenSystèmes de réfrigération et pompes à chaleur - Dispositifs limiteurs de pression et tuyauteries associées - Méthodes de calculRefrigerating systems and heat pumps - Pressure relief devices and their associated piping - Methods for calculation27.200Hladilna tehnologijaRefrigerating technology27.080Heat pumpsICS:Ta slovenski standard je istoveten z:EN 13136:2013SIST EN 13136:2014en01-februar-2014SIST EN 13136:2014SLOVENSKI
STANDARDSIST EN 13136:2002/A1:2005SIST EN 13136:20021DGRPHãþD
EUROPEAN STANDARD NORME EUROPÉENNE EUROPÄISCHE NORM
EN 13136
October 2013 ICS 27.080; 27.200 Supersedes EN 13136:2001English Version
Refrigerating systems and heat pumps - Pressure relief devices and their associated piping - Methods for calculation
Systèmes frigorifiques et pompes à chaleur - Dispositifs de limitation de pression et tuyauteries associées - Méthodes de calcul
Kälteanlagen und Wärmepumpen - Druckentlastungseinrichtungen und zugehörige Leitungen -Berechnungsverfahren This European Standard was approved by CEN on 24 August 2013.
CEN members are bound to comply with the CEN/CENELEC Internal Regulations which stipulate the conditions for giving this European Standard the status of a national standard without any alteration. Up-to-date lists and bibliographical references concerning such national standards may be obtained on application to the CEN-CENELEC Management Centre or to any CEN member.
This European Standard exists in three official versions (English, French, German). A version in any other language made by translation under the responsibility of a CEN member into its own language and notified to the CEN-CENELEC Management Centre has the same status as the official versions.
CEN members are the national standards bodies of Austria, Belgium, Bulgaria, Croatia, Cyprus, Czech Republic, Denmark, Estonia, Finland, Former Yugoslav Republic of Macedonia, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, Netherlands, Norway, Poland, Portugal, Romania, Slovakia, Slovenia, Spain, Sweden, Switzerland, Turkey and United Kingdom.
EUROPEAN COMMITTEE FOR STANDARDIZATION
COMITÉ EUROPÉEN DE NORMALISATION EUROPÄISCHES KOMITEE FÜR NORMUNG
CEN-CENELEC Management Centre:
Avenue Marnix 17,
B-1000 Brussels © 2013 CEN All rights of exploitation in any form and by any means reserved worldwide for CEN national Members. Ref. No. EN 13136:2013: ESIST EN 13136:2014
Values of functions, factors and properties of refrigerants . 17 Annex B (informative)
Calculation of flow areas for non-evaporating and evaporating liquids . 24 B.1 Calculation of the flow area for non-evaporating liquids . 24 B.2 Calculation of the flow area for evaporating liquids . 24 Annex C (informative)
Example of calculation for sizing pressure relief devices with the corresponding pipes . 26 C.1 Assumptions for the calculation example. 27 C.2 Calculation of the required minimum discharge capacity, Qmd
at standard heat flow rate . 27 C.3 Calculation of the required minimum discharge capacity Qmd at reduced heat flow rate . 28 C.4 Calculation of flow area Ac, selection of pressure relief valve . 28 C.5 Pressure loss in upstream line (from vessel to pressure relief valve). 29 C.6 Pressure loss in downstream line (from pressure relief valve to atmosphere) . 30 Annex ZA (informative)
Clauses of this European Standard addressing essential requirements or other provisions of EU Directives . 32 Bibliography. 33
Introduction This European Standard is based on applicable parts of EN ISO 4126-1:2013, EN ISO 4126-2:2003 and EN 12284. It is suited to the specific requirements, and includes the data, of refrigerating systems. It provides means of satisfying the pressure relief devices requirements of EN 378-2:2008+A2:2012. SIST EN 13136:2014
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. 2 Normative references The following documents, in whole or in part, are normatively referenced in this document and are indispensable for its application. For dated references, only the edition cited applies. For undated references, the latest edition of the referenced document (including any amendments) applies. 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 12284:2003, Refrigerating systems and heat pumps — Valves — Requirements, testing and marking 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, Refrigerants — Designation system 3 Terms and definitions For the purposes of this document, the terms and definitions given in EN 378-1:2008+A2:2012, EN 12284:2003, EN ISO 4126-1:2013, EN ISO 4126-2:2003 and EN 764-1:2004 apply. SIST EN 13136:2014
– DN Nominal size (see EN ISO 6708:1995) – d Actual most narrow flow diameter of the pressure relief valve mm dc Calculated flow diameter of the pressure relief valve mm din Inside diameter of inlet tube mm dout Inside diameter of outlet tube mm DR Outside diameter of tube (Table A.4)
mm dR Inside diameter of tube mm hvap Heat of vaporisation calculated at 1,1 times the set pressure of the pressure relief device (for super critical or superheated conditions see 6.1)
kJ/kg Kb Theoretical capacity correction factor for sub-critical flow (Table A.3) – Kd Certified coefficient of discharge taking into account the backpressure ratio pb/po and the possible reduced stroke of the pressure relief valve – Kdr De-rated coefficient of discharge [ζ9,0×=ddrKK – Kdrl De-rated coefficient of discharge for liquid [ζ8,0×≈drdrlKK – Kvs Valve constant (the rate of water flow for a differential pressure ûp of 1 bar at the rated full opening) m3/h Kv Viscosity correction factor – SIST EN 13136:2014
K Isentropic exponent of the refrigerant; for calculation, the value of K shall be as measured at 25 °C and 1,013 bar – L Length of tube mm Lin Length of inlet tube mm Lout Length of outlet tube mm n Rotational frequency min- 1 patm Atmospheric pressure (1 bar) bar pb Back pressure at outlet of pressure relief device, absolute
b
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