ISO-4126-9-2008.pdf
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1、 Reference number ISO 4126-9:2008(E) ISO 2008 INTERNATIONAL STANDARD ISO 4126-9 First edition 2008-04-15 Safety devices for protection against excessive pressure Part 9: Application and installation of safety devices excluding stand-alone bursting disc safety devices Dispositifs de scurit pour prote
2、ction contre les pressions excessives Partie 9: Application et installation des dispositifs de scurit autres que les dispositifs disque de rupture installs seuls Copyright International Organization for Standardization Provided by IHS under license with ISO Licensee=Boeing Co/5910770001 Not for Resa
3、le, 07/25/2008 03:22:50 MDTNo reproduction or networking permitted without license from IHS -,-,- ISO 4126-9:2008(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 typeface
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6、vent 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 m
7、echanical, 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
8、.iso.org Published in Switzerland ii ISO 2008 All rights reserved Copyright International Organization for Standardization Provided by IHS under license with ISO Licensee=Boeing Co/5910770001 Not for Resale, 07/25/2008 03:22:50 MDTNo reproduction or networking permitted without license from IHS -,-,
9、- ISO 4126-9:2008(E) ISO 2008 All rights reserved iii Contents Page Foreword iv Introduction v 1 Scope . 1 2 Normative references. 1 3 Terms and definitions. 1 4 Risk consideration 3 5 Pressure limitation 4 5.1 General. 4 5.2 Setting of safety devices 5 6 Inlet line . 6 7 Outlet line 6 8 Installatio
10、n. 8 8.1 General. 8 8.2 Installation of safety valves or the main valve of a CSPRS or a POSV. 8 8.3 Installation of safety valves and bursting disc safety devices in series or parallel 9 8.4 Isolation of safety devices. 10 9 Lifting device. 11 Annex A (informative) Safety device applications 12 Anne
11、x B (informative) Sizing of multiple safety devices 15 Annex C (informative) Sizing of inlet lines. 17 Annex D (informative) Calculation of built-up back pressure 22 Annex E (informative) Calculation of reaction forces. 29 Annex F (informative) Calculation of noise level 30 Bibliography. 31 Copyrigh
12、t International Organization for Standardization Provided by IHS under license with ISO Licensee=Boeing Co/5910770001 Not for Resale, 07/25/2008 03:22:50 MDTNo reproduction or networking permitted without license from IHS -,-,- ISO 4126-9:2008(E) iv ISO 2008 All rights reserved Foreword ISO (the Int
13、ernational 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 ha
14、s 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
15、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 International Standards adopted by the technical committees are circulated to the member bodie
16、s 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 document may be the subject of patent rights. ISO shall not be held responsible for identifying any o
17、r all such patent rights. ISO 4126-9 was prepared by Technical Committee ISO/TC 185, Safety devices for protection against excessive pressure. ISO 4126 consists of the following parts, under the general title Safety devices for protection against excessive pressure: Part 1: Safety valves Part 2: Bur
18、sting disc safety devices Part 3: Safety valves and bursting disc safety devices in combination Part 4: Pilot-operated safety valves Part 5: Controlled safety pressure relief systems (CSPRS) Part 6: Application, selection and installation of bursting disc safety devices Part 7: Common data Part 9: A
19、pplication and installation of safety devices excluding stand-alone bursting disc safety devices Part 10: Sizing of safety valves and connected inlet and outlet lines for gas/liquid two-phase flow Copyright International Organization for Standardization Provided by IHS under license with ISO License
20、e=Boeing Co/5910770001 Not for Resale, 07/25/2008 03:22:50 MDTNo reproduction or networking permitted without license from IHS -,-,- ISO 4126-9:2008(E) ISO 2008 All rights reserved v Introduction A safety device or system is the final element to protect pressure equipment from exceeding its allowabl
21、e limits. Regulating and/or monitoring devices are not ultimate safety devices in the meaning of this International Standard. They become active in advance of an ultimate safety device (see Figure 1). It is important to consider not only the pressure-relieving device but also the whole of the equipm
22、ent protected, so as not to reduce the relieving capacity or adversely affect the proper operation of the pressure-relieving devices, in order to ensure that the relieving pressure is not exceeded. The value of the relieving pressure is 1,x times the maximum allowable pressure, PS, where x is define
23、d by a directive or national regulation. Operating problems can occur in pressure relief because of the selection of an inappropriate device or because a correctly selected device is adversely affected by improper handling, wrong installation or lack of maintenance. In some cases, it can be necessar
24、y to determine the basic details of the equipment protected so as to ensure that the maximum relieving pressure is not exceeded. NOTE 1 There can be requirements in a number of regulations to be respected and it is the responsibility of the user of this part of ISO 4126 to ensure compliance with the
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