1、BSI Standards Publication Explosive atmospheres Part 40: Requirements for process sealing between flammable process fluids and electrical systems PD IEC/TS 60079-40:2015National foreword This Published Document is the UK implementation of IEC/TS 60079- 40:2015. The UK participation in its preparatio
2、n was entrusted to Technical Committee EXL/31, Equipment for explosive atmospheres. A list of organizations represented on this committee can be obtained on request to its secretary. This publication does not purport to include all the necessary provisions of a contract. Users are responsible for it
3、s correct application. The British Standards Institution 2014 Published by BSI Standards Limited 2014 ISBN 978 0 580 81642 0 ICS 29.260.20 Compliance with a British Standard cannot confer immunity from legal obligations. This Published Document was published under the authority of the Standards Poli
4、cy and Strategy Committee on 28 February 2015. Amendments issued since publication Amd. No. Date Text affected PUBLISHED DOCUMENT PD IEC/TS 60079-40:2015 IEC TS 60079-40 Edition 1.0 2015-02 TECHNICAL SPECIFICATION Explosive atmospheres Part 40: Requirements for process sealing between flammable proc
5、ess fluids and electrical systems INTERNATIONAL ELECTROTECHNICAL COMMISSION ICS 29.260.20 ISBN 978-2-8322-2248-5 Registered trademark of the International Electrotechnical Commission Warning! Make sure that you obtained this publication from an authorized distributor. PD IEC/TS 60079-40:2015 2 IEC T
6、S 60079-40:2015 IEC 2015 CONTENTS FOREWORD . 3 1 Scope 5 2 Normative references. 5 3 Terms and definitions 5 4 General requirements 8 4.1 Basis for requirements 8 4.2 Single process seal equipment 9 4.3 Dual process seal equipment . 9 4.4 Equipment with limited pressure at the electrical connections
7、 . 9 4.5 Purged or pressurized equipment 9 4.6 Add-on secondary process seals . 9 4.7 Annunciators . 10 5 Type verifications and tests . 10 5.1 Test sample 10 5.2 Single process seal equipment 10 5.2.1 Order of conditioning 10 5.2.2 Temperature cycling . 10 5.2.3 Pressure cycling 11 5.2.4 Leakage te
8、st 12 5.2.5 Burst pressure test . 12 5.3 Dual process seal equipment . 12 5.3.1 Primary process seal leakage test 12 5.3.2 Primary process seal burst pressure test 12 5.3.3 Venting pressure determination 12 5.3.4 Verification of annunciation effectiveness . 13 5.3.5 Secondary process seal leakage te
9、st 13 5.4 Verification of limited pressure effectiveness . 13 6 Marking . 13 7 Instructions 13 Annex A (informative) Conditioning and test flowchart 15 Bibliography . 17 Figure 1 Equipment process sealing components 6 Figure 2 Examples of add-on secondary process seals . 8 Figure 3 Temperature cycle
10、 conditioning profile 11 Figure A.1 Conditioning and test flowchart 16 Table 1 Leakage test pressures 12 Table 2 Burst test pressures 12 PD IEC/TS 60079-40:2015IEC TS 60079-40:2015 IEC 2015 3 INTERNATIONAL ELECTROTECHNICAL COMMISSION _ EXPLOSIVE ATMOSPHERES Part 40: Requirements for process sealing
11、between flammable process fluids and electrical systems FOREWORD 1) The International Electrotechnical Commission (IEC) is a worldwide organization for standardization comprising all national electrotechnical committees (IEC National Committees). The object of IEC is to promote international co-oper
12、ation on all questions concerning standardization in the electrical and electronic fields. To this end and in addition to other activities, IEC publishes International Standards, Technical Specifications, Technical Reports, Publicly Available Specifications (PAS) and Guides (hereafter referred to as
13、 “IEC Publication(s)”). Their preparation is entrusted to technical committees; any IEC National Committee interested in the subject dealt with may participate in this preparatory work. International, governmental and non- governmental organizations liaising with the IEC also participate in this pre
14、paration. IEC collaborates closely with the International Organization for Standardization (ISO) in accordance with conditions determined by agreement between the two organizations. 2) The formal decisions or agreements of IEC on technical matters express, as nearly as possible, an international con
15、sensus of opinion on the relevant subjects since each technical committee has representation from all interested IEC National Committees. 3) IEC Publications have the form of recommendations for international use and are accepted by IEC National Committees in that sense. While all reasonable efforts
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17、 transparently to the maximum extent possible in their national and regional publications. Any divergence between any IEC Publication and the corresponding national or regional publication shall be clearly indicated in the latter. 5) IEC itself does not provide any attestation of conformity. Indepen
18、dent certification bodies provide conformity assessment services and, in some areas, access to IEC marks of conformity. IEC is not responsible for any services carried out by independent certification bodies. 6) All users should ensure that they have the latest edition of this publication. 7) No lia
19、bility shall attach to IEC or its directors, employees, servants or agents including individual experts and members of its technical committees and IEC National Committees for any personal injury, property damage or other damage of any nature whatsoever, whether direct or indirect, or for costs (inc
20、luding legal fees) and expenses arising out of the publication, use of, or reliance upon, this IEC Publication or any other IEC Publications. 8) Attention is drawn to the Normative references cited in this publication. Use of the referenced publications is indispensable for the correct application o
21、f this publication. 9) Attention is drawn to the possibility that some of the elements of this IEC Publication may be the subject of patent rights. IEC shall not be held responsible for identifying any or all such patent rights. The main task of IEC technical committees is to prepare International S
22、tandards. In exceptional circumstances, a technical committee may propose the publication of a technical specification when the required support cannot be obtained for the publication of an International Standard, despite repeated efforts, or the subject is still under technical development or where
23、, for any other reason, there is the future but no immediate possibility of an agreement on an International Standard. Technical specifications are subject to review within three years of publication to decide whether they can be transformed into International Standards. IEC 60079-40, which is a tec
24、hnical specification, has been prepared by IEC technical committee 31: Equipment for explosive atmospheres. PD IEC/TS 60079-40:2015 4 IEC TS 60079-40:2015 IEC 2015 The text of this technical specification is based on the following documents: Enquiry draft Report on voting 31/1134/DTS 31/1170/RVC Ful
25、l information on the voting for the approval of this technical specification can be found in the report on voting indicated in the above table. This publication has been drafted in accordance with the ISO/IEC Directives, Part 2. A list of all parts in the IEC 60079 series, published under the genera
26、l title Explosive atmospheres, can be found on the IEC website. The committee has decided that the contents of this publication will remain unchanged until the stability date indicated on the IEC website under “http:/webstore.iec.ch“ in the data related to the specific publication. At this date, the
27、 publication will be transformed into an International standard, reconfirmed, withdrawn, replaced by a revised edition, or amended. A bilingual version of this publication may be issued at a later date. PD IEC/TS 60079-40:2015IEC TS 60079-40:2015 IEC 2015 5 EXPLOSIVE ATMOSPHERES Part 40: Requirement
28、s for process sealing between flammable process fluids and electrical systems 1 Scope This document provides specific requirements for process sealing between a flammable process fluid and an electrical system where a failure could allow the migration of the process fluid directly into the premises
29、wiring system. NOTE Some definitions differentiate the terms “flammable” and “combustible” liquids on the basis of their flashpoints. Combustible liquids under conditions of elevated pressure and/or temperature can lead to the formation of flammable mists and aerosols which are within the scope of t
30、his technical specification. This document contains requirements for evaluation, construction and testing of single process seal equipment, dual process seal equipment, and add-on secondary process seals. The requirements of this document do not apply to conduit sealing devices, cable glands and oth
31、er wiring sealing methods addressed in the IEC 60079 series or other standards. Requirements for basic electrical safety and explosion protection are not addressed by this document, but may apply to the equipment under investigation. The effects of leakage to the environment are not addressed by thi
32、s document. 2 Normative references The following documents, in whole or in part, are normatively referenced in this document and are indispensable for its application. For dated references, only the edition cited applies. For undated references, the latest edition of the referenced document (includi
33、ng any amendments) applies. IEC 60079-0, Explosive atmospheres Part 0: Equipment General requirements IEC 60079-2, Explosive atmospheres Part 2: Equipment protection by pressurized enclosure “p“ 3 Terms and definitions For the purposes of this document the following terms and definitions apply. NOTE
34、 See Figure 1 for a graphical representation of the various process seal components. PD IEC/TS 60079-40:2015 6 IEC TS 60079-40:2015 IEC 2015 Electrical Equipment Process Fluid Primary Process Seal Electrical Equipment Premises Wiring System Secondary Process Seals Vent (when provided) IECFigure 1 Eq
35、uipment process sealing components 3.1 dual process seal equipment equipment which incorporates, along any single potential leakage path, a primary process seal and one or more secondary process seals such that the failure of two or more independent process seals is required to allow migration of pr
36、ocess fluids from their designed containment into the premises wiring system 3.2 process connected equipment electrical equipment that contains a process seal and is intended for connection to an external system that contains the process fluid 3.3 process fluid gas, liquid or vapour that is used in
37、or is a by-product of an industrial process Note 1 to entry: For the purposes of this technical specification, use of the term process fluid refers to a flammable process fluid. For further information, refer to IEC 60079-0, IEC 60079-10-1, and IEC 60079-20-1. 3.4 process seal seal between the elect
38、rical system and a flammable process fluid where a failure could allow the migration of the process fluid into the premises wiring system Note 1 to entry: Although an entire containment system may constitute a potential source of release under unusual conditions, this technical specification recogni
39、zes the concept of infallible containment as defined in IEC 60079-2. 3.5 single process seal equipment equipment that incorporates, along any single potential leakage path, a single sealing structure such that a failure of the seal would result in the migration of the process fluid from the designed
40、 containment into the premises wiring system Note 1 to entry: Single process seal equipment in compliance with this document is considered to have a negligible probability of failure when used in accordance with the manufacturers specification. PD IEC/TS 60079-40:2015IEC TS 60079-40:2015 IEC 2015 7
41、3.6 primary process seal process seal that is directly in contact with process fluids under conditions of normal operation 3.7 secondary process seal process seal that comes into contact with process fluids only in the case of a primary process seal failure 3.8 process seal with moving parts process
42、 seal containing mechanical parts that, under conditions of normal operation, are capable of motion relative to other parts of the seal Note 1 to entry: Examples include seals of shafts and rods that transmit rotary or linear motion into the sealed area. Process seals incorporating the following are
43、 not considered to be process seals with moving parts: a) Thin diaphragms and other structures that may deflect when pressurized; b) Vibrating structures such as tuning forks, coriolis tubes, and vortex sensors. 3.9 unspecified process connected equipment equipment not assessed in accordance with th
44、is document but designed in accordance with applicable standards for the specific type of equipment 3.10 add-on secondary process seal secondary process seal intended to be installed between unspecified process connected equipment and the premises wiring system (see Figure 2) PD IEC/TS 60079-40:2015
45、 8 IEC TS 60079-40:2015 IEC 2015 Process Fluid Primary Process Seal Premises Wiring System Electrical Equipment Add-on Secondary Process Seal Vent (when provided) Unspecified process connected equipmentPremises Wiring System Add-on Secondary Process Seal Unspecified equipment with primary process se
46、al IECFigure 2 Examples of add-on secondary process seals 3.11 equipment with limited pressure at the electrical connections process connected equipment that is rated for a maximum process pressure of 1,5 kPa gauge or is provided with a drain, vent or other means sufficient to prevent pressurizing t
47、he premises wiring connection above 1,5 kPa in the event of a failure of the primary process seal 3.12 premises wiring (system) interior and exterior wiring, including power, lighting, control, and signal circuit wiring together with all their associated hardware, fittings, and wiring devices, both
48、permanently and temporarily installed including (a) wiring from the service point or power source to the outlets or (b) wiring from and including the power source to the outlets where there is no service point Note 1 to entry: Such wiring does not include wiring internal to appliances, luminaires, m
49、otors, controllers, motor control centres, and similar equipment. 3.13 aerosol suspension in air or gas of solid or liquid particles 4 General requirements 4.1 Basis for requirements The manufacturers process seal specifications shall include the following: PD IEC/TS 60079-40:2015IEC TS 60079-40:2015 IEC 2015 9 a) Process temperature range (the process seal temperature may be different than the published process temperature range for the equipment); b) Working pressure range;
