1、 IEC/IEEE 60079-30-2 Edition 1.0 2015-09 INTERNATIONAL STANDARD Explosive atmospheres Part 30-2: Electrical resistance trace heating Application guide for design, installation and maintenance IEC/IEEE60079-30-2:2015-09(en) colourinsideTHIS PUBLICATION IS COPYRIGHT PROTECTED Copyright 2015 IEC, Genev
2、a, Switzerland Copyright 2015 IEEE 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 being secured. Requests for permiss
3、ion to reproduce should be addressed to either IEC at the address below or IECs member National Committee in the country of the requester or from IEEE. IEC Central Office Institute of Electrical and Electronics Engineers, Inc. 3, rue de Varemb 3 Park Avenue CH-1211 Geneva 20 New York, NY 10016-5997
4、Switzerland United States of AmericaTel.: +41 22 919 02 11 stds.iprieee.org Fax: +41 22 919 03 00 www.ieee.org infoiec.ch www.iec.ch About the IEC The International Electrotechnical Commission (IEC) is the leading global organization that prepares and publishes International Standards for all electr
5、ical, electronic and related technologies. About the IEEE IEEE is the worlds largest professional association dedicated to advancing technological innovation and excellence for the benefit of humanity. IEEE and its members inspire a global community through its highly cited publications, conferences
6、, technology standards, and professional and educational activities. About IEC/IEEE publications The technical content of IEC/IEEE publications is kept under constant review by the IEC and IEEE. Please make sure that you have the latest edition, a corrigendum or an amendment might have been publishe
7、d. IEC Catalogue - webstore.iec.ch/catalogue The stand-alone application for consulting the entire bibliographical information on IEC International Standards, Technical Specifications, Technical Reports and other documents. Available for PC, Mac OS, Android Tablets and iPad. IEC publications search
8、- www.iec.ch/searchpub The advanced search enables to find IEC publications by a variety of criteria (reference number, text, technical committee,). It also gives information on projects, replaced and withdrawn publications. IEC Just Published - webstore.iec.ch/justpublished Stay up to date on all n
9、ew IEC publications. Just Published details all new publications released. Available online and also once a month by email. Electropedia - www.electropedia.org The worlds leading online dictionary of electronic and electrical terms containing more than 30 000 terms and definitions in English and Fre
10、nch, with equivalent terms in 15 additional languages. Also known as the International Electrotechnical Vocabulary (IEV) online. IEC Glossary - std.iec.ch/glossary More than 60 000 electrotechnical terminology entries in English and French extracted from the Terms and Definitions clause of IEC publi
11、cations issued since 2002. Some entries have been collected from earlier publications of IEC TC 37, 77, 86 and CISPR. IEC Customer Service Centre - webstore.iec.ch/csc If you wish to give us your feedback on this publication or need further assistance, please contact the Customer Service Centre: csc
12、iec.ch. IEC/IEEE 60079-30-2 Edition 1.0 2015-09 INTERNATIONAL STANDARD Explosive atmospheres Part 30-2: Electrical resistance trace heating Application guide for design, installation and maintenance INTERNATIONAL ELECTROTECHNICAL COMMISSION ICS 29.260.20 IEC ISBN 978-2-8322-2736-7 Warning! Make sure
13、 that you obtained this publication from an authorized distributor. Registered trademark of the International Electrotechnical Commission colourinsideIEEE ISBN 978-0-7381-9848-4 2 IEC/IEEE 60079-30-2:2015 IEC/IEEE 2015 CONTENTS FOREWORD . 6 1 Scope 10 2 Normative references 10 3 Terms and definition
14、s 10 4 Application considerations . 10 4.1 General . 10 4.2 Corrosive areas 11 4.3 Process temperature accuracy 11 4.3.1 Type I 11 4.3.2 Type II . 11 4.3.3 Type III 11 4.4 Installation considerations . 11 5 Thermal insulation . 12 5.1 General . 12 5.2 Selection of insulating material . 12 5.3 Select
15、ion of weather barrier (cladding) 13 5.4 Selection of economical thickness to provide optimum trace heating design 13 5.5 Double insulation 14 6 System design . 17 6.1 General . 17 6.2 Purpose of, and major requirement for, trace heating 17 6.3 Training 18 6.4 Selection of trace heater . 18 6.4.1 Ge
16、neral . 18 6.4.2 Site-fabricated trace heaters 18 6.4.3 Specific types of trace heating . 19 6.5 Maximum temperature determination 19 6.5.1 General . 19 6.5.2 PTC characteristic . 19 6.5.3 Stabilized design . 20 6.5.4 Controlled design. 20 6.6 Heat up and cool down considerations 20 6.7 Design infor
17、mation 20 6.7.1 Design information documentation . 20 6.7.2 Isometric or trace heater configuration line lists and load charts 21 6.8 Power system . 22 6.9 Earthing requirements . 22 6.10 Earth-fault protection of equipment . 23 6.11 Start-up at minimum ambient temperatures . 23 6.12 Long trace heat
18、er runs 23 6.13 Flow pattern analysis 23 6.14 Dead-leg control technique . 25 6.15 Chimney effect 25 6.16 Safety shower and eyewash station design requirements 26 IEC/IEEE 60079-30-2:2015 3 IEC/IEEE 2015 7 Control and monitoring 26 7.1 General . 26 7.2 Mechanical controllers 27 7.3 Electronic contro
19、llers 27 7.4 Application suitability 27 7.5 Location of controllers . 27 7.6 Location of sensors . 28 7.7 Alarm considerations 28 7.7.1 General . 28 7.7.2 Trace heating circuit alarm 28 7.7.3 Temperature alarms 29 7.7.4 Other alarms 29 7.7.5 Integrated control 29 8 Recommendations for installation 2
20、9 8.1 General . 29 8.2 Preparatory work 30 8.2.1 General . 30 8.2.2 Scheduling and coordination 30 8.2.3 Confirmation of equipment . 30 8.2.4 Receiving materials . 30 8.2.5 Warehousing and handling 30 8.2.6 Personnel aspects . 30 8.3 Installation of trace heating circuits . 30 8.3.1 Coordination and
21、 equipment verification 30 8.3.2 Pre-installation testing and design verification . 31 8.3.3 Visual examination 31 8.3.4 Insulation resistance test . 31 8.3.5 Component substitution . 31 8.3.6 Location of power supply . 31 8.3.7 Installation of trace heaters . 32 8.3.8 Connections and terminations 3
22、4 8.4 Installation of control and monitoring equipment . 36 8.4.1 General . 36 8.4.2 Verification of equipment suitability 36 8.4.3 Temperature controller and monitoring devices 36 8.4.4 Sensor considerations . 36 8.4.5 Controller operation, calibration, and access . 40 8.4.6 Necessary modifications
23、 40 8.5 Installation of thermal insulation system (see also Clause 5) . 40 8.5.1 General . 40 8.5.2 Preparatory work . 40 8.5.3 Installation of the thermal insulation materials . 40 8.5.4 Cladding 41 8.5.5 Field (site work) circuit insulation resistance test . 41 8.5.6 Visual inspection . 41 8.5.7 D
24、ocumentation 42 8.6 Installation of distribution wiring and coordination with branch circuits 42 8.6.1 General . 42 8.6.2 Earth-fault protective device 42 4 IEC/IEEE 60079-30-2:2015 IEC/IEEE 2015 8.6.3 Circuit protective device 42 8.6.4 Tagging/Identification 42 8.7 Commissioning . 42 8.7.1 Pre-comm
25、issioning check 42 8.7.2 Functional check and final documentation 43 9 Maintenance 44 9.1 General . 44 9.2 Fault location 44 9.3 Fault rectification 44 10 Repairs 45 10.1 General . 45 10.2 Practicability of repair to electric trace heaters 45 10.2.1 Mechanical damage . 45 10.2.2 Damage due to corros
26、ion . 45 10.2.3 Damage due to overheating . 45 10.3 Repair techniques for electrical trace heaters . 45 10.3.1 General . 45 10.3.2 In-line splice 46 10.3.3 Connection via junction box . 46 10.4 Earthing 46 10.5 Testing . 46 Annex A (informative) Example of design data record 47 Annex B (informative)
27、 Checklist for installation requirements . 48 Annex C (informative) Example of trace heater commissioning record . 50 Annex D (informative) Example of maintenance schedule and log record . 52 Annex E (informative) Pipe heat loss considerations Heat loss formula and example calculations . 54 Annex F
28、(informative) Vessel heat loss considerations . 60 F.1 General . 60 F.2 Insulation heat loss (Qins) . 60 F.3 Slab surface areas (Qslab) 61 F.4 Support heat loss (Qsupt) . 61 F.5 Manhole heat loss (Qmanhole) 62 F.6 Convection coefficient formulae 62 F.6.1 General . 62 F.6.2 Free convection, nonfluid
29、surface, any orientation (hi, hco, ho) 62 F.6.3 Forced convection, any orientation (h0) . 63 F.6.4 Radiation component, all coefficients (hf, hi, hco, ho) . 63 Annex G (informative) Heat up and cool down considerations 65 G.1 Heat up . 65 G.2 Cool down . 66 Annex H (informative) Method to determine
30、equivalent thicknesses of insulating cements 68 Bibliography 69 Figure 1 Thermal insulation Weather-barrier installation 15 Figure 2 Typical temperature profile . 16 IEC/IEEE 60079-30-2:2015 5 IEC/IEEE 2015 Figure 3 Flow pattern analysis example . 24 Figure 4 Bypass example . 25 Figure 5 Typical ins
31、tallation of control sensor and sensor for temperature limiting control 38 Figure 6 Limiting device sensor on sheath of trace heater 38 Figure 7 Limiting device sensor as artificial hot spot 39 Figure E.1 Assumed temperature gradients . 55 Table 1 Pre-installation checks 32 Table A.1 Example of desi
32、gn data record . 47 Table B.1 Example of pre-commissioning check and trace heater installation record 48 Table C.1 Example of trace heater commissioning record 50 Table D.1 Example of maintenance schedule and log record 52 6 IEC/IEEE 60079-30-2:2015 IEC/IEEE 2015 INTERNATIONAL ELECTROTECHNICAL COMMI
33、SSION _ EXPLOSIVE ATMOSPHERES Part 30-2: Electrical resistance trace heating Application guide for design, installation and maintenance FOREWORD 1) The International Electrotechnical Commission (IEC) is a worldwide organization for standardization comprisingall national electrotechnical committees (
34、IEC National Committees). The object of IEC is to promoteinternational co-operation on all questions concerning standardization in the electrical and electronic fields. Tothis end and in addition to other activities, IEC publishes International Standards, Technical Specifications,Technical Reports,
35、Publicly Available Specifications (PAS) and Guides (hereafter referred to as “IECPublication(s)”). Their preparation is entrusted to technical committees; any IEC National Committee interestedin the subject dealt with may participate in this preparatory work. International, governmental and non-gove
36、rnmental organizations liaising with the IEC also participate in this preparation.IEEE Standards documents are developed within IEEE Societies and Standards Coordinating Committees of theIEEE Standards Association (IEEE-SA) Standards Board. IEEE develops its standards through a consensusdevelopment
37、process, approved by the American National Standards Institute, which brings together volunteersrepresenting varied viewpoints and interests to achieve the final product. Volunteers are not necessarilymembers of IEEE and serve without compensation. While IEEE administers the process and establishes
38、rulesto promote fairness in the consensus development process, IEEE does not independently evaluate, test, orverify the accuracy of any of the information contained in its standards. Use of IEEE Standards documents iswholly voluntary. IEEE documents are made available for use subject to important no
39、tices and legal disclaimers(see http:/standards.ieee.org/IPR/disclaimers.html for more information).IEC collaborates closely with IEEE in accordance with conditions determined by agreement between the twoorganizations. This Dual Logo International Standard was jointly developed by the IEC and IEEE u
40、nder theterms of that agreement.2) The formal decisions of IEC on technical matters express, as nearly as possible, an international consensus ofopinion on the relevant subjects since each technical committee has representation from all interested IECNational Committees. The formal decisions of IEEE
41、 on technical matters, once consensus within IEEE Societiesand Standards Coordinating Committees has been reached, is determined by a balanced ballot of materiallyinterested parties who indicate interest in reviewing the proposed standard. Final approval of the IEEEstandards document is given by the
42、 IEEE Standards Association (IEEE-SA) Standards Board.3) IEC/IEEE Publications have the form of recommendations for international use and are accepted by IECNational Committees/IEEE Societies in that sense. While all reasonable efforts are made to ensure that thetechnical content of IEC/IEEE Publica
43、tions is accurate, IEC or IEEE cannot be held responsible for the way inwhich they are used or for any misinterpretation by any end user.4) In order to promote international uniformity, IEC National Committees undertake to apply IEC Publications(including IEC/IEEE Publications) transparently to the
44、maximum extent possible in their national and regionalpublications. Any divergence between any IEC/IEEE Publication and the corresponding national or regionalpublication shall be clearly indicated in the latter.5) IEC and IEEE do not provide any attestation of conformity. Independent certification b
45、odies provide conformityassessment services and, in some areas, access to IEC marks of conformity. IEC and IEEE are not responsiblefor any services carried out by independent certification bodies.6) All users should ensure that they have the latest edition of this publication.7) No liability shall a
46、ttach to IEC or IEEE or their directors, employees, servants or agents including individualexperts and members of technical committees and IEC National Committees, or volunteers of IEEE Societiesand the Standards Coordinating Committees of the IEEE Standards Association (IEEE-SA) Standards Board,for
47、 any personal injury, property damage or other damage of any nature whatsoever, whether direct or indirect,or for costs (including legal fees) and expenses arising out of the publication, use of, or reliance upon, thisIEC/IEEE Publication or any other IEC or IEEE Publications.8) Attention is drawn t
48、o the normative references cited in this publication. Use of the referenced publications isindispensable for the correct application of this publication.9) Attention is drawn to the possibility that implementation of this IEC/IEEE Publication may require use ofmaterial covered by patent rights. By p
49、ublication of this standard, no position is taken with respect to theexistence or validity of any patent rights in connection therewith. IEC or IEEE shall not be held responsible foridentifying Essential Patent Claims for which a license may be required, for conducting inquiries into the legalvalidity or scope of Patent Claims or determining whether any licensing terms or conditions provided inconnection with submission of a Letter of Assurance, if any, or in any licensing agreements are reasonabl
