1、BS ISO21013-1:2008ICS 23.020.40NO COPYING WITHOUT BSI PERMISSION EXCEPT AS PERMITTED BY COPYRIGHT LAWBRITISH STANDARDCryogenic vessels Pressure-reliefaccessories forcryogenic servicePart 1: Reclosable pressure-reliefvalvesThis British Standardwas published under theauthority of the StandardsPolicy a
2、nd StrategyCommittee on 31 July 2008 BSI 2008ISBN 978 0 580 54554 2Amendments/corrigenda issued since publicationDate CommentsBS ISO 21013-1:2008National forewordThis British Standard is the UK implementation of ISO 21013-1:2008.The UK participation in its preparation was entrusted to TechnicalCommi
3、ttee PVE/18, Cryogenic vessels.A list of organizations represented on this committee can be obtained onrequest to its secretary.This publication does not purport to include all the necessary provisionsof a contract. Users are responsible for its correct application.Compliance with a British Standard
4、 cannot confer immunityfrom legal obligations.BS ISO 21013-1:2008Reference numberISO 21013-1:2008(E)ISO 2008INTERNATIONAL STANDARD ISO21013-1First edition2008-06-15Cryogenic vessels Pressure-relief accessories for cryogenic service Part 1: Reclosable pressure-relief valves Rcipients cryogniques Disp
5、ositifs de scurit pour le service cryognique Partie 1: Soupapes refermables BS ISO 21013-1:2008ISO 21013-1:2008(E) PDF disclaimer This PDF file may contain embedded typefaces. In accordance with Adobes licensing policy, this file may be printed or viewed but shall not be edited unless the typefaces
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8、nt that a problem relating to it is found, please inform the Central Secretariat at the address given below. COPYRIGHT PROTECTED DOCUMENT ISO 2008 All rights reserved. Unless otherwise specified, no part of this publication may be reproduced or utilized in any form or by any means, electronic or mec
9、hanical, including photocopying and microfilm, without permission in writing from either ISO at the address below or ISOs member body in the country of the requester. ISO copyright office Case postale 56 CH-1211 Geneva 20 Tel. + 41 22 749 01 11 Fax + 41 22 749 09 47 E-mail copyrightiso.org Web www.i
10、so.org Published in Switzerland ii ISO 2008 All rights reservedBS ISO 21013-1:2008ISO 21013-1:2008(E) ISO 2008 All rights reserved iiiContents Page Foreword iv 1 Scope . 1 2 Normative references . 1 3 Terms and definitions. 2 4 Requirements 3 4.1 General. 3 4.2 Design 3 4.2.1 Design temperature 3 4.
11、2.2 Drainage. 3 4.2.3 Stem guiding . 3 4.2.4 Inserts 3 4.2.5 Sublimating fluids service . 3 4.2.6 Electric continuity. 3 4.2.7 Set pressure 3 4.2.8 Minimum shell thickness . 3 4.3 Materials 4 4.3.1 General. 4 4.3.2 Metallic materials 4 4.3.3 Non-metallic materials 4 4.3.4 Corrosion resistance 4 4.3.
12、5 Gas material compability . 5 4.3.6 Acetylene compatibility 5 5 Qualification and Testing. 5 5.1 Type approval 5 5.1.1 Verification of the design. 5 5.1.2 Model number . 5 5.2 Type approval tests 5 5.2.1 Ambient condition tests. 5 5.2.2 Cryogenic tests . 6 5.2.3 Alternate cryogenic tests. 7 5.3 Pro
13、duction testing 7 6 Determination of the certified coefficient of discharge (Kdr) . 7 7 Set pressure tolerances . 8 8 Re-seating pressure . 8 9 Cleanliness 8 10 Marking 8 10.1 Marking on the body of the pressure-relief valve 8 10.2 Marking on an identification plate. 8 11 Sealing . 9 Bibliography .
14、10 BS ISO 21013-1:2008ISO 21013-1:2008(E) iv ISO 2008 All rights reservedForeword ISO (the International Organization for Standardization) is a worldwide federation of national standards bodies (ISO member bodies). The work of preparing International Standards is normally carried out through ISO tec
15、hnical 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. International organizations, governmental and non-governmental, in liaison with ISO, also take part in the work. ISO collaborates closel
16、y with the International Electrotechnical Commission (IEC) on all matters of electrotechnical standardization. International Standards are drafted in accordance with the rules given in the ISO/IEC Directives, Part 2. The main task of technical committees is to prepare International Standards. Draft
17、International Standards adopted by the technical committees are circulated to the member bodies for voting. Publication as an International Standard requires approval by at least 75 % of the member bodies casting a vote. Attention is drawn to the possibility that some of the elements of this documen
18、t may be the subject of patent rights. ISO shall not be held responsible for identifying any or all such patent rights. ISO 21013-1 was prepared by Technical Committee ISO/TC 220, Cryogenic vessels. ISO 21013 consists of the following parts, under the general title Cryogenic vessels Pressure-relief
19、accessories for cryogenic service: Part 1: Reclosable pressure-relief valves Part 2: Non-reclosable pressure-relief devices Part 3: Sizing and capacity determination BS ISO 21013-1:2008INTERNATIONAL STANDARD ISO 21013-1:2008(E) ISO 2008 All rights reserved 1Cryogenic vessels Pressure-relief accessor
20、ies for cryogenic service Part 1: Reclosable pressure-relief valves 1 Scope This International Standard specifies the requirements for the design, manufacture and testing of pressure relief valves for cryogenic service, i.e. for operation with cryogenic fluids in addition to operation at temperature
21、s from ambient to cryogenic. It is a requirement of this International Standard that the valves comply with ISO 4126-1; in the event of different requirements, this International Standard takes precedence. This International Standard is restricted to valves not exceeding a size of DN 150 designed to
22、 relieve single-phase vapours or gases. A valve may be specified, constructed and tested such that it is suitable for use with more than one gas or with mixtures of gases. NOTE This part of ISO 21013 does not provide methods for determining the capacity of relief valve(s) for a particular cryogenic
23、vessel. Such methods are provided in ISO 21013-3. 2 Normative references The following referenced documents are indispensable for the application of this document. For dated references, only the edition cited applies. For undated references, the latest edition of the referenced document (including a
24、ny amendments) applies. ISO 4126-1, Safety devices for protection against excessive pressure Part 1: Safety valves ISO 11114-1, Transportable gas cylinders Compatibility of cylinder and valve materials with gas contents Part 1: Metallic materials ISO 11114-2, Transportable gas cylinders Compatibilit
25、y of cylinder and valve materials with gas contents Part 2: Non-metallic materials ISO 15761, Steel gate, globe and check valves for sizes DN 100 and smaller, for the petroleum and natural gas industries ISO 20421-1, Cryogenic vessels Large transportable vacuum-insulated vessels Part 1: Design, fabr
26、ication, inspection, and testing ISO 21009-1, Cryogenic vessels Static vacuum-insulated vessels Part 1: Design, fabrication, inspection, and tests ISO 21010, Cryogenic vessels Gas/materials compatibility ISO 21028-1, Cryogenic vessels Toughness requirements for materials at cryogenic temperature Par
27、t 1: Temperatures below 80 C BS ISO 21013-1:2008ISO 21013-1:2008(E) 2 ISO 2008 All rights reservedISO 21028-2, Cryogenic vessels Toughness requirements for materials at cryogenic temperature Part 2: Temperatures between 80 C and 20 C ISO 21029-1, Cryogenic vessels Transportable vacuum insulated vess
28、els of not more than 1 000 litres volume Part 1: Design, fabrication, inspection and tests ISO 23208:2005, Cryogenic vessels Cleanliness for cryogenic service ASME B16.34-2004, Valves Flanged, Threaded, and Welding end 3 Terms and definitions For the purposes of this document, the following terms an
29、d definitions apply. 3.1 DN nominal size alphanumeric designation of size for components of a pipe work system, which is used for reference purposes NOTE 1 It comprises the letters DN followed by a dimensionless whole number which is indirectly related to the physical size, in millimetres, of the bo
30、re or outside diameter of the end connections. NOTE 2 Adapted from ISO 6708. 3.2 pressure pressure for which the value is equal to the algebraic difference between the absolute pressure and the atmospheric pressure NOTE This is also known as gauge pressure. 3.3 rated minimum temperature lowest tempe
31、rature for which the pressure relief valve is rated by the manufacturer 3.4 valve category A relief valve type which passed the test of the repeatability of seat tightness at re-seat for 1 000 cycles NOTE The procedure for the seat-tightness test is described in 5.2.1.2. 3.5 valve category B relief
32、valve type which passed the test of the repeatability of seat tightness at re-seat for 20 cycles NOTE The procedure for the seat-tightness test is described in 5.2.1.2. 3.6 cryogenic fluid fluid defined as cryogenic fluid in ISO 21029-1, or ISO 21009-1, or ISO 20421-1 NOTE This includes totally evap
33、orated liquids and supercritical fluids. 3.7 rated pressure PR maximum pressure difference between the inside and outside of any pressure-retaining boundary for which it is designed to be operated at 20 C NOTE The PR of the valve is the lowest PR of any component of the valve. BS ISO 21013-1:2008ISO
34、 21013-1:2008(E) ISO 2008 All rights reserved 34 Requirements 4.1 General The valve shall satisfy all the requirements of ISO 4126-1 except in the event of different requirements, where this part of ISO 21013 takes precedence. 4.2 Design 4.2.1 Design temperature The valve shall be suitable for opera
35、tion at all temperatures between the rated minimum temperature and +65 C within the intended pressure range. 4.2.2 Drainage Unless otherwise specified in the purchase order, the valve shall avoid accumulation of water within it, even when the expected outlet connection is fitted. 4.2.3 Stem guiding
36、The design of guiding shall avoid malfunction of the valve due to deposition and freezing of atmospheric moisture on and within the valve during normal operation. The valve shall be sufficiently robust such that the effectiveness of the guiding can not be defeated by normal handling. 4.2.4 Inserts W
37、here a disc soft-insert is used to ensure leak-tight shut off, the design shall be such as to prevent cold flow of the insert to a degree that results in the valve failing to operate correctly. 4.2.5 Sublimating fluids service Where the valve is specified as suitable for service with products that,
38、when vented at valve operating conditions, condense from gas or vapour directly to solid, e.g. CO2, the design shall be such as to avoid the valve failing to operate correctly due to deposition of solid product within the valve body or its outlet. 4.2.6 Electric continuity For valves in flammable fl
39、uids service, the maximum electrical resistance shall not exceed 1 000 with no more than 28 V between the ports in order to ensure electrical continuity to prevent build-up of static electrictiy. 4.2.7 Set pressure Set pressure of the valve shall not exceed its PR. 4.2.8 Minimum shell thickness The
40、minimum shell thickness shall be as specified in ISO 15761 or ASME B16.34 for the pressure rating and size of the valve. BS ISO 21013-1:2008ISO 21013-1:2008(E) 4 ISO 2008 All rights reserved4.3 Materials 4.3.1 General Materials shall be in conformance with an internationally recognized standard and
41、be compatible with the fluid. Galling, frictional heating, and galvanic corrosion shall also be considered in the selection of materials. Materials shall also be oxygen compatible if relevant (see 4.3.5.1). Materials not listed in an internationally recognized standard shall be controlled by the man
42、ufacturer of the pressure-relief valve by a specification ensuring control of chemical content and physical properties, and quality at least equivalent to an internationally recognized standard. A test certificate providing the chemical content and physical property test results shall be provided wi
43、th the pressure-relief valve. 4.3.2 Metallic materials 4.3.2.1 Metallic materials to be used in the construction of cryogenic valves shall meet the requirements of ISO 21028-1 or ISO 21028-2 as appropriate for the rated minimum temperature. 4.3.2.2 These requirements apply only to the valve parts ex
44、posed to low temperatures in normal service. Metallic materials which do not exhibit ductile/brittle transition, and non ferrous materials which can be shown to have no ductile/brittle transition do not require additional impact tests. 4.3.2.3 Forged, rolled, wrought, and fabricated valve components
45、 from raw materials from these processes need not be impact tested if the rated minimum temperature is higher than the ductile/brittle transition range temperatures of the material. Castings meeting the requirements of one of the applicable mandatory Appendices I and IV or II and III for Forgings an
46、d Rolled or Wrought Material of ASME B16.34 need not be impact tested if the rated minimum temperature is higher than the ductile/brittle transition range temperatures of the material. At least one randomly selected valve body material (including bonnet, if applicable) from each production-lot casti
47、ngs not meeting the requirements of 4.3.2.3 shall be impact tested at the rated minimum temperature. 4.3.3 Non-metallic materials Non-metallic materials are well established only for use for inserts on the disc or seat to provide leak tightness across the seat when the valve is closed. If such mater
48、ials are to be used for structural parts, they shall have the properties appropriate to the application and be in conformance with ISO 21028-1 or ISO 21028-2, as appropriate to the rated minimum temperature. Non-metallic materials shall also: have mechanical properties that will allow the valve to p
49、ass the type approval test defined in 5.1.3.3; be resistant to sunlight, weather and aging; be compliant to section 4.3.5. 4.3.4 Corrosion resistance In addition to resistance to normal atmospheric corrosion, particular care must be taken to ensure that the valve can not be rendered inoperative by accumulation of corrosion products. Some copper alloys are susceptible to stress corrosion cracking, consequently careful consideration shall be given before selection of these materia
