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1、 Reference number ISO 16852:2008(E) ISO 2008 INTERNATIONAL STANDARD ISO 16852 First edition 2008-03-01 Flame arresters Performance requirements, test methods and limits for use Arrte-flammes Exigences de performance, mthodes dessai et limites dutilisation Copyright International Organization for Sta
2、ndardization Provided by IHS under license with ISO Licensee=Boeing Co/5910770001 Not for Resale, 07/25/2008 04:28:56 MDTNo reproduction or networking permitted without license from IHS -,-,- ISO 16852:2008(E) PDF disclaimer This PDF file may contain embedded typefaces. In accordance with Adobes lic
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5、een taken to ensure that the file is suitable for use by ISO member bodies. In the unlikely event 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 o
6、f this publication may be reproduced or utilized in any form or by any means, electronic or mechanical, 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 C
7、H-1211 Geneva 20 Tel. + 41 22 749 01 11 Fax + 41 22 749 09 47 E-mail copyrightiso.org Web www.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,
8、 07/25/2008 04:28:56 MDTNo reproduction or networking permitted without license from IHS -,-,- ISO 16852:2008(E) ISO 2008 All rights reserved iii Contents Page Foreword. v Introduction. vi 1 Scope . 1 2 Normative references. 1 3 Terms and definitions. 2 4 Symbols. 4 5 Hazards and flame arrester clas
9、sifications 6 5.1 Flame transmission: deflagration, stable and unstable detonation 6 5.2 Flame transmission: stabilized burning. 7 6 General requirements. 7 6.1 Measuring instruments 7 6.2 Construction 7 6.3 Housings 8 6.4 Joints 8 6.5 Pressure test . 8 6.6 Leak test 8 6.7 Flow measurement (air) 8 6
10、.8 Flame transmission test. 9 6.9 Summary of tests to be conducted. 11 7 Specific requirements for static flame arresters. 12 7.1 Construction 12 7.2 Design series. 12 7.3 Flame transmission test. 13 7.4 Limits for use 26 8 Specific requirements for liquid product detonation flame arresters. 27 8.1
11、Liquid seals . 27 8.2 Foot valves 28 8.3 Flame transmission test. 29 8.4 Limits for use 30 9 Specific requirements for dynamic flame arresters (high velocity vent valves) 30 9.1 General. 30 9.2 Flame transmission test. 30 9.3 Endurance burning test 31 9.4 Limits for use 33 10 Specific requirements f
12、or hydraulic flame arresters 33 10.1 Equipment . 33 10.2 Flame transmission test. 34 10.3 Limits for use 35 11 Information for use. 37 11.1 Instructions for use 37 11.2 Marking 37 Annex A (normative) Flow measurement 40 Annex B (informative) Information for selecting flame arresters 44 Annex C (info
13、rmative) Best practice. 45 Copyright International Organization for Standardization Provided by IHS under license with ISO Licensee=Boeing Co/5910770001 Not for Resale, 07/25/2008 04:28:56 MDTNo reproduction or networking permitted without license from IHS -,-,- ISO 16852:2008(E) iv ISO 2008 All rig
14、hts reserved Annex D (informative) Use of in-line stable detonation flame arresters.46 Bibliography .47 Copyright International Organization for Standardization Provided by IHS under license with ISO Licensee=Boeing Co/5910770001 Not for Resale, 07/25/2008 04:28:56 MDTNo reproduction or networking p
15、ermitted without license from IHS -,-,- ISO 16852:2008(E) ISO 2008 All rights reserved v Foreword 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
16、 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 col
17、laborates closely 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 S
18、tandards. Draft 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
19、 of this document may be the subject of patent rights. ISO shall not be held responsible for identifying any or all such patent rights. ISO 16852 was prepared by Technical Committee ISO/TC 21, Equipment for fire protection and fire fighting. Copyright International Organization for Standardization P
20、rovided by IHS under license with ISO Licensee=Boeing Co/5910770001 Not for Resale, 07/25/2008 04:28:56 MDTNo reproduction or networking permitted without license from IHS -,-,- ISO 16852:2008(E) vi ISO 2008 All rights reserved Introduction Flame arresters are safety devices fitted to openings of en
21、closures or to pipe work, and are intended to allow flow but prevent flame transmission. They have widely been used for decades in the chemical and oil industry, and a variety of national standards is available. This International Standard was prepared by an international group of experts, whose aim
22、 was to establish an international basis by harmonizing and incorporating recent national developments and standards as far as reasonable. This International Standard addresses manufacturers (performance requirements) and test institutes (test methods), as well as customers (limits for use). Only re
23、latively general performance requirements are specified and these are kept to a strict minimum. Experience has shown that excessively specific requirements in this field often create unjustified restrictions and prevent innovative solutions. The hazard identification of common applications found in
24、industry leads to the specification of the test methods. These test methods reflect standard practical situations and, as such, form the heart of this International Standard because they also allow classification of the various types of flame arresters and then determination of the limits of use. A
25、considerable number of test methods and test conditions had to be taken into account for two main reasons: a) different types of flame arresters are covered with respect to the operating principle (static, hydraulic, liquid, dynamic), and each type clearly needs its specific test set-up and test pro
26、cedure; b) it is necessary to adapt flame arresters to the special conditions of application (gas, installation) because of the conflicting demands of high flame quenching capability and low pressure loss; this situation is completely different from the otherwise similar principle of protection by f
27、lameproof enclosure (of electrical equipment), where the importance of gas flow through gaps is negligible. Consequently, in this International Standard, the testing and classification related to the gas groups and the installation conditions has been subdivided more than is usually the case. In par
28、ticular, explosion group IIA is subdivided into sub-groups IIA1 and IIA, explosion group IIB is subdivided into sub-groups IIB1, IIB2, IIB3 and IIB, and the type “detonation arrester” is divided into four sub-types, which take into account specific installation situations. The test conditions lead t
29、o the limits for use which are most important for the customer. This International Standard specifies this safety relevant information and its dissemination through the manufacturers written instructions for use and the marking of the flame arresters. The limits for use are also a link to more gener
30、al (operational) safety considerations and regulations, which remain the responsibility of national or corporate authorities. Annexes B, C and D offer some guidance in this field. Copyright International Organization for Standardization Provided by IHS under license with ISO Licensee=Boeing Co/59107
31、70001 Not for Resale, 07/25/2008 04:28:56 MDTNo reproduction or networking permitted without license from IHS -,-,- INTERNATIONAL STANDARD ISO 16852:2008(E) ISO 2008 All rights reserved 1 Flame arresters Performance requirements, test methods and limits for use 1 Scope This International Standard sp
32、ecifies the requirements for flame arresters that prevent flame transmission when explosive gas-air or vapour-air mixtures are present. It establishes uniform principles for the classification, basic construction and information for use, including the marking of flame arresters, and specifies test m
33、ethods to verify the safety requirements and determine safe limits of use. This International Standard is valid for pressures ranging from 80 kPa to 160 kPa and temperatures ranging from 20 C to +150 C. NOTE 1 In designing and testing flame arresters for operation under conditions other than those s
34、pecified above, this International Standard can be used as a guide. However, additional testing related specifically to the intended conditions of use is advisable. This is particularly important when high temperatures and pressures are applied. The test mixtures might need to be modified in these c
35、ases. This International Standard is not applicable to the following: external safety-related measurement and control equipment that might be required to keep the operational conditions within the established safe limits; NOTE 2 Integrated measurement and control equipment, such as integrated temper
36、ature and flame sensors as well as parts which, for example, intentionally melt (retaining pin), burn away (weather hoods) or bend (bimetallic strips), is within the scope of this International Standard. flame arresters used for explosive mixtures of vapours and gases, which tend to self-decompose (
37、e.g. acetylene) or which are chemically unstable; flame arresters used for carbon disulphide, due to its special properties; flame arresters whose intended use is for mixtures other than gas-air or vapour-air mixtures (e.g. higher oxygen-nitrogen ratio, chlorine as oxidant, etc.); flame arrester tes
38、t procedures for internal-combustion compression ignition engines; fast acting valves, extinguishing systems and other explosion isolating systems; flame arresters integrated or combined with explosion-protected equipment, such as blowers, fans, compressors and pumps. 2 Normative references The foll
39、owing 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 any amendments) applies. IEC 60079-1, Explosive atmospheres Part 1: Equipment prot
40、ection by flameproof enclosures “d” Copyright International Organization for Standardization Provided by IHS under license with ISO Licensee=Boeing Co/5910770001 Not for Resale, 07/25/2008 04:28:56 MDTNo reproduction or networking permitted without license from IHS -,-,- ISO 16852:2008(E) 2 ISO 2008
41、 All rights reserved IEC 60079-1-1:2002, Electrical apparatus for explosive gas atmospheres Part 1-1: Flameproof enclosures “d” Method of test for ascertainment of maximum experimental safe gap 3 Terms and definitions For the purposes of this document, the following terms and definitions apply. 3.1
42、flame arrester device fitted to the opening of an enclosure, or to the connecting pipe work of a system of enclosures, and whose intended function is to allow flow but prevent the transmission of flame 3.2 housing portion of a flame arrester whose principal function is to provide a suitable enclosur
43、e for the flame arrester element and allow mechanical connections to other systems 3.3 flame arrester element portion of a flame arrester whose principal function is to prevent flame transmission 3.4 stabilized burning steady burning of a flame stabilized at, or close to, the flame arrester element
44、3.5 short time burning stabilized burning for a specified time 3.6 endurance burning stabilized burning for an unlimited time 3.7 explosion abrupt oxidation or decomposition reaction producing an increase in temperature, pressure, or in both simultaneously 3.8 deflagration explosion propagating at s
45、ubsonic velocity 3.9 detonation explosion propagating at supersonic velocity and characterized by a shock wave 3.10 stable detonation detonation progressing through a confined system without significant variation of velocity and pressure characteristics NOTE For the atmospheric conditions, test mixt
46、ures and test procedures of this International Standard, typical velocities range between 1 600 m/s and 2 200 m/s. 3.11 unstable detonation detonation during the transition of a combustion process from a deflagration into a stable detonation Copyright International Organization for Standardization P
47、rovided by IHS under license with ISO Licensee=Boeing Co/5910770001 Not for Resale, 07/25/2008 04:28:56 MDTNo reproduction or networking permitted without license from IHS -,-,- ISO 16852:2008(E) ISO 2008 All rights reserved 3 NOTE The transition occurs in a limited spatial zone, where the velocity
48、of the combustion wave is not constant and where the explosion pressure is significantly higher than in a stable detonation. The position of this transition zone depends, amongst other factors, on pipe diameter, pipe configuration, test gas and explosion group. 3.12 Characteristic safety data of explosive mixtures 3.12.1 maximum experimental safe gap MESG safe gap measured in accordance with IEC 60079-1-1:2002 3.12.2 explosion group Ex.G ranking of fla