IEEE 60079-30-2-2015 en Explosive atmospheres C Part 30-2 Electrical resistance trace heating C Application guide for design installation and maintenance《易爆气体 第.pdf

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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

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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 (

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