This Standard was not superseded for safety engineering reasons. The new standard was adopted to extend the standard's scope beyond Europe. Work is already in hand to revise the ISO Standard; another update has become necessary to cover in particular the testing of high-velocity vent valves. This Standard is intended for tanks containing petroleum and petroleum products but is can also be applied to tanks containing other liquids. This Directive defines basic safety and health requirements that need to be satisfied by manufacturers of such equipment and systems.
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Details of the software products used to create this PDF file can be found in the General Info relative to the file; the PDF-creation parameters were optimized for printing. Every care has been 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. ISO 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 mechanical, including photocopying and microfilm, without permission in writing from either ISO at the address below or ISO's member body in the country of the requester.
ISO copyright office Case postale 56? CH Geneva 20 Tel. 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.
The main task of technical committees is to prepare International Standards. Draft International Standards adopted by the technical committees are circulated to the member bodies for voting. 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. 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 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 relatively 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 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 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 procedure; 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 flameproof 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 particular,? The test conditions lead to the limits for use which are most important for the customer. This International Standard specifies this safety relevant information and its dissemination through the manufacturer's written instructions for use and the marking of the flame arresters.
The limits for use are also a link to more general 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. It establishes uniform principles for the classification, basic construction and information for use, including the marking of flame arresters, and specifies test methods to verify the safety requirements and determine safe limits of use. This International Standard is valid for pressures ranging from 80 kPa to kPa and temperatures ranging from?
NOTE 1 In designing and testing flame arresters for operation under conditions other than those specified 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 cases. This International Standard is not applicable to the following:? For dated references, only the edition cited applies. For undated references, the latest edition of the referenced document including any amendments applies. The position of this transition zone depends, amongst other factors, on pipe diameter, pipe configuration, test gas and explosion group.
A flame arrester covering only this hazard is classified as a deflagration flame arrester. A deflagration when confined in a pipe may accelerate and undergo transition through an unstable to a stable detonation, provided sufficient pipe length is available. This pipe length may vary depending upon the initial conditions of the mixture and the pipe work configuration. A flame arrester tested in accordance with 7. Unstable detonations are a specific hazard requiring higher performance flame arresters than for stable detonations.
These hazards relate to specific installations and in suitable for operational pressures p0 u pTB, and the each case application the flame arrester successfully tested at pTB is limited to mixtures with an MESG equal to is or greater than that tested. The specific hazards covered by this International Standard, the classification and the testing required for the appropriate flame arrester are listed in Table 1. The following situations shall be taken into account:? NOTE It is advisable that the uncertainty of measurement in the tests be such that it can be shown that all the required test parameter limits are met.
Production flame arresters shall have flame quenching capabilities no less than the tested flame arrester. Coatings of components which may be exposed to flames during operation shall not be damaged in a way that makes flame transmission possible. Flame arresters for short time burning shall be fitted with one or more integrated temperature sensors, taking into account the intended orientation of the flame arrester.
No permanent deformation shall occur during the test. End-of-line deflagration flame arresters need not be pressure tested. No leak shall occur. End-of-line deflagration flame arresters need not be leak tested. The flow capacity of in-line flame arresters shall be recorded in accordance with Clause A.
The flow capacity of end-of-line flame arresters shall be recorded in accordance with Clause A. The flow capacity of dynamic flame arresters shall be recorded in accordance with Clause A. In addition, all dynamic flame arresters shall be tested for undamped oscillations in accordance with Clause A.
There shall be no permanent visible deformation of the housing. The tests shall be specific for the basic types of operation as defined in 3. One flame arrester shall be used throughout all deflagration or detonation flame transmission tests. No replacement parts or modifications shall be made to the flame arrester during these tests. Short time and endurance burning tests shall be carried out in the orientation to be used in service.
Bi-directional flame arresters shall only be tested from one side if the protected and unprotected sides are identical. All flame transmission tests shall be carried out with gas-air mixtures at ambient temperatures. Gas-air or vapour-air mixtures shall be as specified in 6. Depending on their intended use, flame arresters shall be tested to the specific explosion group of the explosive gas-air or vapour-air mixture see Table 2, columns 1 and 2.
IIA1 shall only be used for the testing of deflagration flame arresters. A flame arrester for a particular explosion group is suitable for explosive mixtures of another group having a higher MESG. NOTE The testing of flame arresters attached to flow machines e. Gas-air mixtures for testing shall be established with a concentration measuring instrument or a MESG test apparatus. For IIB, the mixture shall be on the lower half side of the specified percentage volume range.
All the stated full range tolerances relate to the uncertainty of the measuring equipment. Tests may be carried out using a gas-air mixture of a lower safe gap. Table 5 — Summary of tests to be conducted Type of flame arrester End-of-line deflagration flame arrester short time burn proof endurance burn proof short time burn proof In-line deflagration flame arrester endurance burn proof Pre-volume flame arrester Stable detonation flame arrester without restriction short time burn proof endurance burn proof Stable detonation flame arrester with restriction short time burn proof endurance burn proof Unstable detonation flame arrester short time burn proof without restriction endurance burn proof Unstable detonation flame arrester short time burn proof with restriction endurance burn proof Liquid seal and foot valve Dynamic flame arrester high velocity vent valve Hydraulic flame arrester Flame transmission test 7.
For flame arrester elements with quenching gaps, the dimensions and tolerances shall be indicated for example, gap length and width of gap. For production reasons, the gap dimensions may be less than the lower tolerance limit in the inner and outer areas of the flame arrester element. Evidence shall be available that manufacture is controlled within tolerances to ensure reproducibility.
Materials for flame arresters shall be suitable for the intended use e. The design series shall comply with the following: a one drawing shall cover all nominal sizes in a design series and all parts shall be listed and dimensioned; b the flame arrester elements shall have identical features of construction, such as the quenching gaps, and shall have the same thickness measured in the direction of the flame path.
Additional requirements for in-line flame arresters are the following:? Table 6 — Connection Nominal size of connection mm 10 20 32 60 75 Design series to to to 50 to to to to to 15 25 40 65 80 Normen-Download-Beuth-Braunschweiger Flammenfilter GmbH-KdNr. NOTE These end-of-line venting systems could be classified as follows: a as end-of-line deflagration arresters, in accordance with 7. The protected and unprotected side of a flame arrester may be modified to allow connection to smaller pipe sizes without further testing.
The connection on the protected side shall not be smaller than the connection on the unprotected side. The temperatures mixture, pipe, flame arrester during testing shall be given in the test report.
Distances shall be measured from the top of the complete flame arrester. For end-of-line flame arresters with non-measurable elements, it might be necessary to pressurize the plastic bag see 7. In this case, the mixture outlet item 6 in Figure 1 needs to be fitted with a shut-off valve. Assemble the flame arrester with all ancillary equipment, including weather cowls or other covers, and enclose it in a plastic bag.
Fill the apparatus, fully inflating the bag with a mixture as specified in 6. Disconnect the mixture supply and ignite. The ignition source shall be a spark plug. Carry out two tests for each ignition point so that a total of six tests will result.
Flame transmission shall be indicated by the flame detector on the protected side. No flame transmission shall occur in any of the tests.
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BS EN ISO 16852:2016
ISO specifies 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 methods to verify the safety requirements and determine safe limits of use. NOTE 1 For flame arresters with operational conditions inside the scope, but outside atmospheric conditions, see 7. NOTE 2 In designing and testing flame arresters for operation under conditions other than those specified 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.
BS EN ISO 16852:2016 - TC
In accordance with Adobe's licensing policy, this file may be printed or viewed but shall not be edited unless the typefaces which are embedded are licensed to and installed on the computer performing the editing. In downloading this file, parties accept therein the responsibility of not infringing Adobe's licensing policy. Adobe is a trademark of Adobe Systems Incorporated. Details of the software products used to create this PDF file can be found in the General Info relative to the file; the PDF-creation parameters were optimized for printing. Every care has been 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.