1、BSI Standards PublicationBS ISO 5208:2015Industrial valves Pressuretesting of metallic valvesBS ISO 5208:2015 BRITISH STANDARDNational forewordThis British Standard is the UK implementation of ISO 5208:2015. Itsupersedes BS ISO 5208:2008 which is withdrawn.The UK participation in its preparation was
2、 entrusted to TechnicalCommittee PSE/18/1, Industrial valves, steam traps, actuators andsafety devices against excessive pressure - Valves - Basic standards.A list of organizations represented on this committee can beobtained on request to its secretary.This publication does not purport to include a
3、ll the necessaryprovisions of a contract. Users are responsible for its correctapplication. The British Standards Institution 2015. Published by BSI StandardsLimited 2015ISBN 978 0 580 86943 3ICS 23.060.01Compliance with a British Standard cannot confer immunity fromlegal obligations.This British St
4、andard was published under the authority of theStandards Policy and Strategy Committee on 31 July 2015.Amendments issued since publicationDate Text affectedBS ISO 5208:2015 ISO 2015Industrial valves Pressure testing of metallic valvesRobinetterie industrielle Essais sous pression des appareils de ro
5、binetterie mtalliquesINTERNATIONAL STANDARDISO5208Fourth edition2015-06-15Reference numberISO 5208:2015(E)BS ISO 5208:2015ISO 5208:2015(E)ii ISO 2015 All rights reservedCOPYRIGHT PROTECTED DOCUMENT ISO 2015, Published in SwitzerlandAll rights reserved. Unless otherwise specified, no part of this pub
6、lication may be reproduced or utilized otherwise in any form or by any means, electronic or mechanical, including photocopying, or posting on the internet or an intranet, without prior written permission. Permission can be requested from either ISO at the address below or ISOs member body in the cou
7、ntry of the requester.ISO copyright officeCh. de Blandonnet 8 CP 401CH-1214 Vernier, Geneva, SwitzerlandTel. +41 22 749 01 11Fax +41 22 749 09 47copyrightiso.orgwww.iso.orgBS ISO 5208:2015ISO 5208:2015(E)Foreword ivIntroduction v1 Scope . 12 Terms and definitions . 13 Conditions relevant to pressure
8、 testing . 23.1 Purchaser examination options . 23.2 Witnessing 33.3 Closure pressure testing options . 34 Requirements for pressure testing . 34.1 Forewarning 34.2 Location . 34.3 Test equipment . 34.4 Pressure measuring equipment . 34.5 Shell surfaces 34.6 Test fluid . 44.7 Test pressure. 44.8 Pre
9、ssure tests . 44.9 Closure test compliance 44.10 Shell test 64.10.1 Shell test fluid . 64.10.2 Shell test procedure 64.10.3 Shell test pressure 64.10.4 Shell test duration . 64.10.5 Shell test acceptance criteria . 64.11 Optional backseat test 74.11.1 General 74.11.2 Backseat test fluid . 74.11.3 Re
10、commended backseat test procedure . 74.11.4 Backseat test pressure 74.11.5 Backseat test duration 74.11.6 Backseat test acceptance criteria 84.12 Closure test . 84.12.1 General requirements 84.12.2 Closure test fluid 84.12.3 Leak detection 84.12.4 Closure test pressure 94.12.5 Closure test duration
11、94.12.6 Closure test progression . 94.12.7 Closure test acceptance criteria 94.13 Certification of compliance 9Annex A (normative) Equivalent DN numbers 12Bibliography .13 ISO 2015 All rights reserved iiiContents PageBS ISO 5208:2015ISO 5208:2015(E)ForewordISO (the International Organization for Sta
12、ndardization) is a worldwide federation of national 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 righ
13、t to be represented on that committee. International 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
14、used to develop this document and those intended 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 rule
15、s of the ISO/IEC Directives, Part 2 (see www.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 identif
16、ied during the development of the document will 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
17、the meaning of ISO specific terms and expressions 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
18、/TC 153, Valves.This fourth edition cancels and replaces the third edition (ISO 5208:2008), which has been technically revised including the following changes: a new definition 2.12 of visually detectable leakage was added; Table 1 has been updated by differencing concentric and eccentric butterfly
19、valves and by adding an optional high pressure closure test with gas; 4.12.4.1 a) has been updated to take into account nominal pressures PN 6 and lower.iv ISO 2015 All rights reservedBS ISO 5208:2015ISO 5208:2015(E)IntroductionThe purpose of this International Standard is the establishment of basic
20、 requirements and practices for pressure testing valves of various configurations that are used in general purpose, power generation, petroleum, and petrochemical or allied industry applications. The intent is to provide a consistent set of procedural requirements and acceptance criteria that can be
21、 considered in conjunction with valve specific standards appropriate for specific applications. Account has been taken of the valve testing requirement needs of EN 12266 and API 598 with requirements referenced for PN designated valves for the former and Class designated valves for the latter. ISO 2
22、015 All rights reserved vBS ISO 5208:2015BS ISO 5208:2015Industrial valves Pressure testing of metallic valvesWARNING Persons using this International Standard should be familiar with normal testing practice. This International Standard does not purport to address all of the safety issues, if any, a
23、ssociated with its use. It is the responsibility of the user to establish appropriate safety and health practices and to ensure compliance with any national regulatory requirements in particular, when using high pressure gas for testing.1 ScopeThis International Standard specifies examinations and t
24、ests that a valve manufacturer needs to act upon in order to establish the integrity of the pressure boundary of an industrial metallic valve and to verify the degree of valve closure tightness and the structural adequacy of its closure mechanism. This International Standard is intended to be applie
25、d in conjunction with the specific requirements of a valve product standard to the extent cited by the product standard as a normative reference. Where requirements of a product standard differ from those given in this International Standard, the requirements of the product standard apply.This Inter
26、national Standard is not applicable to the safety aspects of pressure testing.2 Terms and definitionsFor the purposes of this document, the following terms and definitions apply.2.1shell testtest at a pressure in excess of the cold working pressure (2.9) rating of a valve for the purpose of validati
27、ng the soundness and strength of the valve pressure containing and retaining structuresNote 1 to entry: These structures include valve-actuating mechanisms that have a direct connection to the valve internals subject to fluid test pressure within the valve proper.2.2closure testpressure test for the
28、 purpose of validating leakage through a valves closure mechanism2.3test pressureinternal pressure (gauge), expressed in bar to which the valve under test is subjectedNote 1 to entry: Unless otherwise noted, gauge pressure is used throughout this International Standard.Note 2 to entry: 1 bar = 105Pa
29、.2.4test fluidpressurized liquid or gas used to test a valve2.5test fluid temperaturetemperature of the test fluid, 5 C and 40 CINTERNATIONAL STANDARD ISO 5208:2015(E) ISO 2015 All rights reserved 1BS ISO 5208:2015ISO 5208:2015(E)2.6resilient seatsbroad category of seating surface materials that mak
30、e up a pliable seat sealing combination, including elastomeric, polymeric, solid and semi-solid grease seals, either used in combination or used in conjunction with a mating metallic or ceramic component2.7DN or NPSalphanumeric designation of size that is common for components used in a piping syste
31、m, used for reference purposes, comprising the letters DN or NPS followed by a dimensionless number indirectly related to the physical size of the bore or outside diameter of the end connectionsNote 1 to entry: The number following DN or NPS does not represent a measurable value and is not used for
32、calculation purposes except where specified in a product standard.2.8PN or Classalphanumeric designation for pressure-temperature rating that is common for components used in a piping system, used for reference purposes, comprising the letters “PN or Class” followed by a dimensionless number indirec
33、tly related to the pressure retaining capability as a function of temperature of the componentNote 1 to entry: The number following “PN or Class” does not represent a measurable value and is not used for calculation purposes except where specified in a product standard. There is no definitive correl
34、ation that links PN designations to Class designations.2.9cold working pressureCWPmaximum fluid pressure assigned to a valve for operation at a fluid temperature of 20 C to 38 CNote 1 to entry: Valve pressure-temperature ratings are specified in product standards by reference to PN or Class designat
35、ions.2.10design differential pressurelimiting pressure difference across the upstream and downstream sides of the closure element seals when the valve is in the closed positionNote 1 to entry: While the standard is for this to be equal to the CWP there may be circumstances that dictate a lesser pres
36、sure difference.2.11double block-and-bleed valvevalve with two separate closure seating surfaces that, when in the closed position, block flow from both ends where the cavity between the two seating surfaces is fitted with a bleed connection to which either temporary or permanent piping or piping co
37、mponents may be installed2.12visually detectable leakageleakage during a valve pressure test, either through or past a pressure boundary or closure member that is observed with normal vision3 Conditions relevant to pressure testing3.1 Purchaser examination options3.1.1 A purchaser may specify, in a
38、valve procurement purchase order, examination and pressure testing requirements along with the opportunity to be witness to specific in-process examinations and tests as regards valves that are the subject of the purchase order. In this event, a representative of the 2 ISO 2015 All rights reservedBS
39、 ISO 5208:2015ISO 5208:2015(E)purchaser shall be allowed access to those areas of the manufacturers site that are involved with related examination and pressure testing of the purchase order valves.3.1.2 When a purchaser specifies examinations or testing to be witnessed as described in 3.1.1, the va
40、lve manufacturer shall give notice to the purchaser at least five working days prior to the purchase order specified activity.3.2 WitnessingIf pressure testing in the presence of a representative of the purchaser is specified for valves that are in stock, painted or coated valves from stock may be r
41、etested without removal of painting or coating.3.3 Closure pressure testing optionsA purchaser may specify, in a valve procurement purchase order, optional closure testing. See Table 1.4 Requirements for pressure testing4.1 ForewarningA user of this International Standard needs to properly take into
42、 account the hazard involved with working with pressurized gases and liquids.4.2 LocationPressure tests shall take place either at the site of the valve manufacture or at a test facility under the supervision of the valve manufacturer.4.3 Test equipment4.3.1 The test equipment shall be of such a des
43、ign, that it does not subject the valve to externally applied loads that may affect the results of the test. When end-clamping devices are used, the valve manufacturer shall be able to demonstrate that, during the valve closure test, they do not serve to reduce the resultant leakage. Valves designed
44、 for installation between flanges, e.g. wafer style check or butterfly valves, shall not have test equipment clamping forces applied that are so great as to bear upon the pressure test results.4.3.2 When equipment such as volume loss detection devices are used, the manufacturer shall be capable of d
45、emonstrating equivalence of the system with the requirements of this International Standard.4.4 Pressure measuring equipmentThe equipment used for measuring test fluid pressure shall measure the fluid pressure with an accuracy of 5 % of the required test pressure.4.5 Shell surfacesBefore the shell t
46、est, valves shall not be externally painted or otherwise coated with materials capable of sealing against leakage from external surfaces of the shell. However, valves with internal liners, internal linings or internal coatings that form a design feature of the valve may be tested with the liner, lin
47、ing or coating in place. In the event a purchaser specifies a retest of the shell test of valves that have been painted, retesting may be without removal of external paint or coatings. ISO 2015 All rights reserved 3BS ISO 5208:2015ISO 5208:2015(E)4.6 Test fluidThe test fluid to be used, as specified
48、 in the relevant tests detailed in this International Standard, shall be: water, that may contain a corrosion inhibitor, kerosene or other appropriate liquid having a viscosity not greater than that of water, or air or other suitable gas.The temperature of the test fluid shall be between 5 C and 40
49、C. Pressure testing valves with shell components of austenitic stainless steel, using water as the test fluid, requires that the chloride content of the water shall not exceed 100 106(100 ppm).NOTE A purchaser may specify, in a valve procurement purchase order, that a wetting agent be added to water used as a test fluid.4.7 Test pressureExcept for low-pressure closure testing, test pressures are related to the valve CWP which in turn is related to the shell material of the valve under test.NOTE Piping systems in which valves are i
