International Iso Standard 5208 Seieco Com-Books Pdf

INTERNATIONAL ISO STANDARD 5208 seieco com
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ISO 5208 2015 E, COPYRIGHT PROTECTED DOCUMENT, ISO 2015 Published in Switzerland. All rights reserved Unless otherwise specified no part of this publication 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 ISO s member body in the country of. the requester, ISO copyright office, Ch de Blandonnet 8 CP 401. CH 1214 Vernier Geneva Switzerland, Tel 41 22 749 01 11. Fax 41 22 749 09 47, copyright iso org, www iso org. ii ISO 2015 All rights reserved, ISO 5208 2015 E, Contents Page.
Foreword iv, Introduction v, 2 Terms and definitions 1. 3 Conditions relevant to pressure testing 2, 3 1 Purchaser examination options 2. 3 2 Witnessing 3, 3 3 Closure pressure testing options 3. 4 Requirements for pressure testing 3, 4 1 Forewarning 3. 4 2 Location 3, 4 3 Test equipment 3, 4 4 Pressure measuring equipment 3.
4 5 Shell surfaces 3, 4 6 Test fluid 4, 4 7 Test pressure 4. 4 8 Pressure tests 4, 4 9 Closure test compliance 4. 4 10 Shell test 6, 4 10 1 Shell test fluid 6, 4 10 2 Shell test procedure 6. 4 10 3 Shell test pressure 6, 4 10 4 Shell test duration 6. 4 10 5 Shell test acceptance criteria 6, 4 11 Optional backseat test 7.
4 11 1 General 7, 4 11 2 Backseat test fluid 7, 4 11 3 Recommended backseat test procedure 7. 4 11 4 Backseat test pressure 7, 4 11 5 Backseat test duration 7. 4 11 6 Backseat test acceptance criteria 8, 4 12 Closure test 8. 4 12 1 General requirements 8, 4 12 2 Closure test fluid 8. 4 12 3 Leak detection 8, 4 12 4 Closure test pressure 9.
4 12 5 Closure test duration 9, 4 12 6 Closure test progression 9. 4 12 7 Closure test acceptance criteria 9, 4 13 Certification of compliance 9. Annex A normative Equivalent DN numbers 12, Bibliography 13. ISO 2015 All rights reserved iii, ISO 5208 2015 E, 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 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 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 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 rules 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 identified 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 the meaning of ISO specific terms and expressions related to conformity. assessment as well as information about ISO s adherence to the WTO principles in the Technical Barriers. to Trade TBT see the following URL Foreword Supplementary information. The committee responsible for this document is ISO 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 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 reserved, ISO 5208 2015 E, Introduction. The purpose of this International Standard is the establishment of basic 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 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 2015 All rights reserved v, INTERNATIONAL STANDARD ISO 5208 2015 E.
Industrial valves Pressure testing of metallic valves. WARNING 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 associated 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. This International Standard specifies examinations and tests 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 applied 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 International Standard is not applicable to the safety aspects of pressure testing. 2 Terms and definitions, For the purposes of this document the following terms and definitions apply. shell test, test at a pressure in excess of the cold working pressure 2 9 rating of a valve for the purpose of validating. the soundness and strength of the valve pressure containing and retaining structures. Note 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. closure test, pressure test for the purpose of validating leakage through a valve s closure mechanism. test pressure, internal pressure gauge expressed in bar to which the valve under test is subjected.
Note 1 to entry Unless otherwise noted gauge pressure is used throughout this International Standard. Note 2 to entry 1 bar 105 Pa, test fluid, pressurized liquid or gas used to test a valve. test fluid temperature, temperature of the test fluid 5 C and 40 C. ISO 2015 All rights reserved 1, ISO 5208 2015 E, resilient seats. broad category of seating surface materials that make 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 component. alphanumeric designation of size that is common for components used in a piping system 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 connections. Note 1 to entry The number following DN or NPS does not represent a measurable value and is not used for. calculation purposes except where specified in a product standard. PN or Class, alphanumeric 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 indirectly related to the pressure retaining capability as a function of temperature. of the component, Note 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 correlation that links. PN designations to Class designations, cold working pressure. maximum fluid pressure assigned to a valve for operation at a fluid temperature of 20 C to 38 C. Note 1 to entry Valve pressure temperature ratings are specified in product standards by reference to PN or. Class designations, design differential pressure, limiting pressure difference across the upstream and downstream sides of the closure element seals. when the valve is in the closed position, Note 1 to entry While the standard is for this to be equal to the CWP there may be circumstances that dictate a. lesser pressure difference, double block and bleed valve. valve 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 components may be installed. visually detectable leakage, leakage during a valve pressure test either through or past a pressure boundary or closure member.
that is observed with normal vision, 3 Conditions relevant to pressure testing. 3 1 Purchaser examination options, 3 1 1 A purchaser may specify in a 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 reserved, ISO 5208 2015 E, purchaser shall be allowed access to those areas of the manufacturer s 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. valve manufacturer shall give notice to the purchaser at least five working days prior to the purchase. order specified activity, 3 2 Witnessing, If 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 retested without removal of painting or coating. 3 3 Closure pressure testing options, A purchaser may specify in a valve procurement purchase order optional closure testing See Table 1.
4 Requirements for pressure testing, 4 1 Forewarning. A user of this International Standard needs to properly take into account the hazard involved with. working with pressurized gases and liquids, 4 2 Location. Pressure 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 equipment. 4 3 1 The test equipment shall be of such a design 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 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 demonstrating equivalence of the system with the requirements of this International Standard. 4 4 Pressure measuring equipment, The 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 surfaces.
Before the shell test 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 lining. 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 3, ISO 5208 2015 E, 4 6 Test fluid. The test fluid to be used as specified 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 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 10 6 100 ppm, NOTE A purchaser may specify in a valve procurement purchase order that a wetting agent be added to. ISO 5208 2015 E Introduction The purpose of this International Standard is the establishment of basic requirements and practices for pressure testing valves of various configurations that are used in general purpose power generation

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