资源描述：
BRITISH STANDARD BS EN 131362001 Incorporating Amendment No. 1 Refrigerating systems and heat pumps Pressure relief devices and their associated piping s for calculation The European Standard EN 131362001, with the incorporation of amendment A12005, has the status of a British Standard ICS 27.080; 27.200 BS EN 131362001 This British Standard was published under the authority of the Standards Policy and Strategy Committee on 15 September 2001 BSI 2006 ISBN 0 580 38288 5 National foreword This British Standard is the official English language version of EN 131362001, including amendment A12005. The start and finish of text introduced or altered by CEN amendment is indicated in the text by tags “. Tags indicating changes to CEN text carry the number of the CEN amendment. For example, text altered by CEN amendment A1 is indicated in the text by “. The UK participation in its preparation was entrusted to Technical Committee RHE/18, Refrigeration safety, which has the responsibility to A list of organizations represented on this committee can be obtained on request to its secretary. Cross-references The British Standards which implement international or European publications referred to in this document may be found in the BSI Catalogue under the section entitled “International Standards Correspondence Index”, or by using the “Search” facility of the BSI Electronic Catalogue or of British Standards Online. This publication does not purport to include all the necessary provisions of a contract. Users are responsible for its correct application. Compliance with a British Standard does not of itself confer immunity from legal obligations. aid enquirers to understand the text; present to the responsible international/European committee any enquiries on the interpretation, or proposals for change, and keep UK interests ined; monitor related international and European developments and promulgate them in the UK. Summary of pages This document comprises a front cover, an inside front cover, the EN title page, pages 2 to 24, an inside back cover and a back cover. The BSI copyright notice displayed in this document indicates when the document was last issued. Amendments issued since publication Amd. No. DateComments 1592831 July 2006See national foreword EUROPEAN STANDARD NORME EUROPENNE EUROPISCHE NORM EN 13136 May 2001 ICS 27.080; 27.200 English version Refrigerating systems and heat pumps - Pressure relief devices and their associated piping - s for calculation Systmes de rfrigration et pompes chaleur - Dispositifs de surpression et tuyauteries associes - Mthodes de calcul Klteanlagen und Wrmepumpen - Druckentlastungseinrichtungen und zugehrige Leitungen - Berechnungsverfahren 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 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 Management Centre has the same status as the official versions. EUROPEAN COMMITTEE FOR STANDARDIZATION COMIT EUROPEN DE NORMALISATION EUROPISCHES KOMITEE FR NORMUNG Management Centre rue de Stassart, 36 B-1050 Brussels 2001 CENAll rights of exploitation in any and by any means reserved worldwide for CEN national Members. A1 June 2005 includes amendment A12005 inclut l’amendement A12005 enthlt nderung A12005 This European Standard was approved by CEN on 7 March 2001; amendment A1 was approved by CEN on 12 May 2005. CEN members are the national standards bodies of Austria, Belgium, Cyprus, Czech Republic, Denmark, Estonia, Finland, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, Netherlands, Norway, Poland, Portugal, Slovakia, Slovenia, Spain, Sweden, Switzerland and United Kingdom. Ref. No. EN 131362001 A12005 E Page 2 EN 131362001 Contents Page Foreword ............................................................................................................................................................................ 2 Introduction ........................................................................................................................................................................ 2 1 Scope ............................................................................................................................................................................ 3 2 Normative references ................................................................................................................................................... 3 3 Terms and definitions ................................................................................................................................................... 3 4 Symbols ........................................................................................................................................................................ 4 5 General ......................................................................................................................................................................... 6 6 Pressure relief devices for protection of system components ..................................................................................... 6 7 Discharge capacities of pressure relief devices ........................................................................................................... 8 Annex A normative Values of functions, factors and properties of refrigerants ......................................................... 12 Annex B inative Calculation of flow areas for non-evaporating and evaporating liquids ................................... 16 Annex C inative Example of calculation for sizing pressure relief devices with the corresponding pipes ......... 18 Annex ZA inative Clauses of this European Standard addressing essential requirements or other provisions of EU Directives ........................................................................................................................................... 23 Bibliography ....................................................................................................................................................................... 24 Foreword This European Standard has been prepared by Technical Committee CEN/TC 182 “Refrigerating systems, safety and environmental requirements“, the secretariat of which is held by DIN. This European Standard shall be given the status of a national standard, either by publication of an identical text or by endorsement, at the latest by November 2001, and conflicting national standards shall be withdrawn at the latest by November 2001. This European Standard has been prepared under a mandate given to CEN by the European Commission and the European Free Trade Association, and supports essential requirements of the EU Directives. For relationship with the EU Directives, see inative annex ZA which is an integral part of this standard. According to the CEN/CENELEC Internal Regulations, the national standards organizations of the following countries are bound to implement this European Standard Austria, Belgium, Czech Republic, Denmark, Finland, France, Germany, Greece, Iceland, Ireland, Italy, Luxembourg, Netherlands, Norway, Portugal, Spain, Sweden, Switzerland and the United Kingdom. Foreword to amendment A1 This document EN 131362001/A12005 has been prepared by the Technical Committee CEN/TC 182 “Refrigerating systems, safety and environmental requirements” the Secretariat of which is held by DIN. This Amendment to the European Standard EN 131362001 shall be given the status of a national standard, either by publication of an identical text or by endorsement, at the latest by December 2005, and conflicting national standards shall be withdrawn at the latest by December 2005. According to the CEN/CENELEC Internal Regulations, the national standards organizations of the following countries are bound to implement this European Standard Austria, Belgium, Cyprus, Czech Republic, Denmark, Estonia, Finland, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, Netherlands, Norway, Poland, Portugal, Slovakia, Slovenia, Spain, Sweden, Switzerland and the United Kingdom. Introduction This European Standard is based on applicable parts of EN ISO 4126-12004, EN ISO 4126-22003 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.“ w w w . b z f x w . c o m Page 3 EN 131362001 1 Scope 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 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 General.“ 2 Normative references This European Standard incorporates, by dated or undated reference, provisions from other publications. These normative references are cited at the appropriate places in the text and the publications are listed hereafter. For dated references, subsequent amendments to or revisions of any of these publications apply to this European Standard only when incorporated in it by amendment or revision. For undated references, the latest edition of the publication referred to applies including amendments. EN ISO 4126-1, Safety devices for protection against excessive pressure Part 1 Safety valves ISO 4126-12004.. EN ISO 4126-2, Safety devices for protection against excessive pressure Part 2 Bursting disc safety devices ISO 4126-22003. EN 12284, Refrigerating systems and heat pumps Valves Requirements, testing and marking. EN 764-1, Pressure equipment – Part 1 Terminology – Pressure, temperature, volume, nominal size EN 764-2, Pressure equipment – Part 2 Quantities, symbols and units“ 3 Terms and definitions For the purposes of this European Standard the definitions given in EN 378-1, EN 12284, EN ISO 4126-1, EN 4126-2 and EN 764-1 apply.“ w w w . b z f x w . c o m Page 4 EN 131362001 4 Symbols For the purposes of this standard the following symbols are used Symbol DesignationUnit A Flow area of the pressure relief valve 2 d 4 π A ⎛⎞ ⎜⎟ ⎝⎠ mm2 Ac Calculated flow area mm2 ADN Valve cross section related to DN mm2 Ain Inside area of inlet tube mm2 Aliq Calculated flow area of liquid after expansion mm2 Aout Inside area of outlet tube mm2 AR Inside area of tube mm2 Asurf External surface area of the vessel m2 Avap Calculated flow area of vapour after expansionmm2 C Function of the isentropic exponents table A.2 – DN Nominal size see EN ISO 6708 1995 – d Actual flow diameter of the pressure relief valvemm 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 vaporization calculated at 1,1 times the set pressure of the pressure relief device 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/p0 and the possibly reduced stroke of the pressure relief valve“ – Kdr Derated coefficient of discharge drld KKX 0,9 – Kdrl Derated coefficient of discharge for liquid drldr KK≈X 0,8 – Kvs Valve constant The rate of water flow for a differential pressure Δp of 1 bar at the rated full opening m3/h Kv Viscosity correction factor – k Isentropic exponent at the relieving inlet – L Length of tube mm Lin Length of inlet tube mm Lout Length of outlet tube mm n Rotational frequency min-1 continued
展开阅读全文
