1、BS EN ISO 21013-3:2016Cryogenic vessels Pressure-r e l i e f a c c e s s o r i e s f o r c r y o g e n i cservicePart 3: Sizing and capacity determination(ISO 21013-3:2016)BSI Standards PublicationWB11885_BSI_StandardCovs_2013_AW.indd 1 15/05/2013 15:06BS EN ISO 21013-3:2016 BRITISH STANDARDNational
2、 forewordThis British Standard is the UK implementation of EN ISO 21013-3:2016. It supersedes BS EN 13648-3:2002 and BS ISO 21013-3:2006 which are withdrawn.The UK participation in its preparation was entrusted to TechnicalCommittee PVE/18, Cryogenic vessels.A list of organizations represented on th
3、is committee can beobtained on request to its secretary.This publication does not purport to include all the necessaryprovisions of a contract. Users are responsible for its correctapplication. The British Standards Institution 2016.Published by BSI Standards Limited 2016ISBN 978 0 580 78165 0ICS 23
4、.020.40Compliance with a British Standard cannot confer immunity fromlegal obligations.This British Standard was published under the authority of theStandards Policy and Strategy Committee on 30 June 2016.Amendments/corrigenda issued since publicationDate T e x t a f f e c t e dEUROPEAN STANDARD NOR
5、ME EUROPENNE EUROPISCHE NORM EN ISO 21013-3 June 2016 ICS 23.020.40 Supersedes EN 13648-3:2002English Version Cryogenic vessels - Pressure-relief accessories for cryogenic service - Part 3: Sizing and capacity determination (ISO 21013-3:2016) Rcipients cryogniques - Dispositifs de scurit pour le ser
6、vice cryognique - Partie 3: Dtermination de la taille et du volume (ISO 21013-3:2016) Kryo-Behlter - Druckentlastungseinrichtungen fr den Kryo-Betrieb - Teil 3: Bestimmung von Gre und Durchfluss (ISO 21013-3:2016) This European Standard was approved by CEN on 15 April 2016. CEN members are bound to
7、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-CEN
8、ELEC 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 th
9、e 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, Luxemb
10、ourg, Malta, Netherlands, Norway, Poland, Portugal, Romania, Slovakia, Slovenia, Spain, Sweden, Switzerland, Turkey andUnited Kingdom. EUROPEAN COMMITTEE FOR STANDARDIZATION COMIT EUROPEN DE NORMALISATION EUROPISCHES KOMITEE FR NORMUNG CEN-CENELEC Management Centre: Avenue Marnix 17, B-1000 Brussels
11、 2016 CEN All rights of exploitation in any form and by any means reserved worldwide for CEN national Members. Ref. No. EN ISO 21013-3:2016 EBS EN ISO 21013-3:2016EN ISO 21013-3:2016 (E) 3 European foreword This document (EN ISO 21013-3:2016) has been prepared by Technical Committee ISO/TC 220 “Cryo
12、genic vessels” in collaboration with Technical Committee CEN/TC 268 “Cryogenic vessels and specific hydrogen technologies applications” the secretariat of which is held by AFNOR. This European Standard shall be given the status of a national standard, either by publication of an identical text or by
13、 endorsement, at the latest by December 2016, and conflicting national standards shall be withdrawn at the latest by December 2016. Attention is drawn to the possibility that some of the elements of this document may be the subject of patent rights. CEN and/or CENELEC shall not be held responsible f
14、or identifying any or all such patent rights. This document supersedes EN 13648-3:2002. This document has been prepared under a mandate given to CEN by the European Commission and the European Free Trade Association, and supports essential requirements of EU Directive. For relationship with EU Direc
15、tive, see informative Annex ZA, which is an integral part of this document. According to the CEN-CENELEC Internal Regulations, the national standards organizations of the following countries are bound to implement this European Standard: Austria, Belgium, Bulgaria, Croatia, Cyprus, Czech Republic, D
16、enmark, 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 the United Kingdom. Endorsement
17、 notice The text of ISO 21013-3:2016 has been approved by CEN as EN ISO 21013-3:2016 without any modification. BS EN ISO 21013-3:2016EN ISO 21013-3:2016 (E) 4 Annex ZA (informative) Relationship between this European Standard and the Essential Requirements of EU Directive (2014/68/UE Pressure Equipm
18、ent Directive) This European Standard has been prepared under a mandate given to CEN by the European Commission to provide a means of conforming to Essential Requirements of the New Approach Directive (2014/68/UE Pressure Equipment Directive) Once this standard is cited in the Official Journal of th
19、e European Union under that Directive and has been implemented as a national standard in at least one Member State, compliance with the clauses of this standard given in Table ZA.1 confers, within the limits of the scope of this standard, a presumption of conformity with the corresponding Essential
20、Requirements of that Directive and associated EFTA regulations. Table ZA.1 Correspondence between this European Standard and Directive (2014/68/UE Pressure Equipment Directive) Clause(s)/subclause(s) of this EN Essential Requirements (ERs) of Directive Qualifying remarks/Notes 4, 5 Protection agains
21、t exceeding the allowable limits of pressure equipment Annex I, 2.10 6, 7 Safety accessories Annex I, 2.11 4.3 External fire Annex I, 2.12 WARNING Other requirements and other EU Directives may be applicable to the product(s) falling within the scope of this standard. BS EN ISO 21013-3:2016ISO 21013
22、-3:2016(E)Foreword v1 Scope . 12 Normative references 13 Symbols 24 Calculation of the total quantity of heat transferred per unit time from the hot wall (outer jacket) to the cold wall (inner vessel) 64.1 General . 64.2 Under conditions other than fire . 64.2.1 Vacuum-insulated vessels under normal
23、 vacuum 64.2.2 Pressure build-up device 74.2.3 Vacuum-insulated vessels in the case of loss of vacuum and non-vacuum insulated vessels 74.2.4 Supports and piping 94.3 Under fire conditions . 94.3.1 Insulation system remains fully or partially in place during fire conditions . 94.3.2 Insulation syste
24、m does not remain in place during fire conditions .104.4 Air or Nitrogen condensation 104.4.1 General. 104.4.2 Loss of vacuum with air and nitrogen 104.4.3 Fire with loss of vacuum with air or nitrogen .114.5 Heat transfer per unit time (watts) 124.5.1 General. 124.5.2 Normal operation .124.5.3 Pres
25、sure build up regulator fully open 124.5.4 Loss of vacuum condition 124.5.5 Fire condition with loss of vacuum, vacuum jacket, and insulation fully or partially in place 134.5.6 Fire condition with loss of vacuum, insulation not in place 134.5.7 Total heat transfer rate 135 Calculation of the mass f
26、low to be relieved by pressure relief devices .135.1 Relieving pressure, P, less than the critical pressure .135.2 Relieving pressure, P, equal to or greater than the critical pressure 145.3 Example 146 Piping for pressure relief devices 156.1 Pressure drop 156.1.1 General. 156.1.2 Relief valves . 1
27、56.1.3 Bursting discs 156.2 Back pressure consideration . 166.3 Heat transfer 167 Sizing of pressure relief devices 177.1 General 177.2 Sizing of pressure relief valves . 177.2.1 Discharge capacity.177.2.2 Determination of critical vs. subcritical flow for gases .187.2.3 Critical flow . 187.2.4 Subc
28、ritical flow .197.2.5 Recommended analysis method 207.2.6 Example 227.3 Sizing of bursting discs . 267.3.1 Discharge capacity.26 ISO 2016 All rights reserved iiiContents PageBS EN ISO 21013-3:2016ISO 21013-3:2016(E)7.3.2 Determination of critical vs. subcritical flow for gases .277.3.3 Critical flow
29、 . 277.3.4 Subcritical flow .277.3.5 Recommended analysis method 287.3.6 Example 31Annex A (informative) Cryostats 34Bibliography .35iv ISO 2016 All rights reservedBS EN ISO 21013-3:2016ISO 21013-3:2016(E)ForewordISO (the International Organization for Standardization) is a worldwide federation of n
30、ational standards bodies (ISO member bodies). The work of preparing International Standards is normally carried out through ISO technical committees. Each member body interested in a subject for which a technical committee has been established has the right to be represented on that committee. Inter
31、national organizations, governmental and non-governmental, in liaison with ISO, also take part in the work. ISO collaborates closely with the International Electrotechnical Commission (IEC) on all matters of electrotechnical standardization.The procedures used to develop this document and those inte
32、nded for its further maintenance are described in the ISO/IEC Directives, Part 1. In particular the different approval criteria needed for the different types of ISO documents should be noted. This document was drafted in accordance with the editorial rules of the ISO/IEC Directives, Part 2 (see www
33、.iso.org/directives).Attention is drawn to the possibility that some of the elements of this document may be the subject of patent rights. ISO shall not be held responsible for identifying any or all such patent rights. Details of any patent rights identified during the development of the document w
34、ill be in the Introduction and/or on the ISO list of patent declarations received (see www.iso.org/patents).Any trade name used in this document is information given for the convenience of users and does not constitute an endorsement.For an explanation on the meaning of ISO specific terms and expres
35、sions related to conformity assessment, as well as information about ISOs adherence to the WTO principles in the Technical Barriers to Trade (TBT) see the following URL: Foreword - Supplementary informationThe committee responsible for this document is ISO/TC 220, Cryogenic vessels.This second editi
36、on cancels and replaces the first edition (ISO 21013-3:2006), which has been technically revised.ISO 21013 consists of the following parts, under the general title Cryogenic vessels Pressure-relief accessories for cryogenic service: Part 1: Reclosable pressure-relief valves Part 2: Non-reclosable pr
37、essure-relief devices Part 3: Sizing and capacity determination Part 4: Pressure-relief accessories for cryogenic service ISO 2016 All rights reserved vBS EN ISO 21013-3:2016BS EN ISO 21013-3:2016Cryogenic vessels Pressure-relief accessories for cryogenic service Part 3: Sizing and capacity determin
38、ation1 ScopeThis part of ISO 21013 provides separate calculation methods for determining the required mass flow to be relieved for each of the following specified conditions: vacuum-insulated vessels with insulation system (outer jacket + insulating material) intact under normal vacuum, outer jacket
39、 at ambient temperature, inner vessel at temperature of the contents at the specified relieving pressure; vacuum-insulated vessels with insulation system (outer jacket + insulating material) intact under normal vacuum, outer jacket at ambient temperature, inner vessel at temperature of the contents
40、at the specified relieving pressure, pressure regulator of the pressure build-up system functioning at full potential; vacuum or non-vacuum-insulated vessels with insulation system remaining in place, but with loss of vacuum in the case of vacuum-insulated vessels, outer jacket at ambient temperatur
41、e, inner vessel at temperature of the contents at the specified relieving pressure or vacuum or non-vacuum-insulated vessels with insulation system remaining fully or partially in place, but with loss of vacuum in the case of vacuum-insulated vessels, fire engulfment, inner vessel at temperature of
42、the contents at the specified relieving pressure; vacuum-insulated vessels containing fluids with saturation temperature below 75 K at 1 bar with insulation system remaining in place, but with loss of vacuum with air or nitrogen in the vacuum space; vacuum insulated vessels containing fluids with sa
43、turation temperature below 75 K at 1 bar with insulation system remaining in place, but with loss of vacuum with air or nitrogen in the vacuum space with fire engulfment; vessels with insulation system totally lost and fire engulfment.Good engineering practice based on well-established theoretical p
44、hysical science needs to be adopted to determine the required mass flow where an appropriate calculation method is not provided for an applicable condition.Recommendations for pressure relief devices for cryostats are given in Annex A.2 Normative referencesThere are no normative references in this d
45、ocument.INTERNATIONAL STANDARD ISO 21013-3:2016(E) ISO 2016 All rights reserved 1BS EN ISO 21013-3:2016ISO 21013-3:2016(E)3 SymbolsA arithmetic mean of inner and outer surface areas of vessel insulating material m2ABactual flow area of a pipe element m2Aetotal outer surface area of pipe network betw
46、een the outer jacket and location xm2AFminimum flow area (reference area) in a pipe network m2AFdminimum flow area (reference area) in the pipe network, downstream of relief valvem2AFuminimum flow area (reference area) in the pipe network, upstream of relief valvem2Aitotal outside surface area of in
47、ner vessel m2Ajtotal outer surface area of pipe network between the inner and outer jackets (interspace)m2ALlarger flow area of a pipe element containing two different flow area sizes m2Ancross-sectional area, support, or pipe material m2ARarea ratio, AS/ALASsmaller flow area of a pipe element conta
48、ining two different flow area sizes m2AVactual flow (orifice) area of a pressure relief valve mm2AVaactual flow (orifice) area of pressure relief valve selected for final analysis mm2AV1minimum required relief valve flow (orifice) area mm2A2external heat transfer surface area of ambient air vaporize
49、r m2cpconstant pressure specific heat capacity at the average of Tnand TekJ/(kgK)CVexperimentally determined flow rate through a pipe element or device gal/min/psie1nominal insulating material thickness, normal vacuum, non-fire condition me3minimum insulating material thickness, considering loss of vacuum, non-fire conditionme5insulating material thickness remaining in place during fire conditions mfTpipe flow friction coefficient h enthalpy of fluid at conditions of kJ/kghrspecific enthalpy at relief valve inlet and outlet
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