BS EN 60079-30-2:2017:2018 Edition
$215.11
Explosive atmospheres – Electrical resistance trace heating. Application guide for design, installation and maintenance
| Published By | Publication Date | Number of Pages |
| BSI | 2018 | 74 |
This part of IEC 60079 provides guidance for the application of electrical resistance trace heating systems in areas where explosive atmospheres may be present, with the exclusion of those classified as requiring EPL Ga/Da (traditional relationship to Zone 0 and Zone 20 respectively). It provides recommendations for the design, installation, maintenance and repair of trace heating systems including associated control and monitoring equipment. It does not cover devices that operate by induction heating, skin effect heating or direct pipeline heating, nor those intended for stress relieving.
PDF Catalog
| PDF Pages | PDF Title |
|---|---|
| 2 | undefined |
| 5 | Annex ZA(normative)Normative references to international publicationswith their corresponding European publications |
| 6 | CONTENTS |
| 10 | FOREWORD |
| 14 | 1 Scope 2 Normative references 3 Terms and definitions 4 Application considerations 4.1 General |
| 15 | 4.2 Corrosive areas 4.3 Process temperature accuracy 4.3.1 Type I 4.3.2 Type II 4.3.3 Type III 4.4 Installation considerations |
| 16 | 5 Thermal insulation 5.1 General 5.2 Selection of insulating material |
| 17 | 5.3 Selection of weather barrier (cladding) 5.4 Selection of economical thickness to provide optimum trace heating design |
| 18 | 5.5 Double insulation |
| 19 | Figures Figure 1 – Thermal insulation – Weather-barrier installation |
| 20 | Figure 2 – Typical temperature profile |
| 21 | 6 System design 6.1 General 6.2 Purpose of, and major requirement for, trace heating |
| 22 | 6.3 Training 6.4 Selection of trace heater 6.4.1 General 6.4.2 Site-fabricated trace heaters |
| 23 | 6.4.3 Specific types of trace heating 6.5 Maximum temperature determination 6.5.1 General 6.5.2 PTC characteristic |
| 24 | 6.5.3 Stabilized design 6.5.4 Controlled design 6.6 Heat up and cool down considerations 6.7 Design information 6.7.1 Design information documentation |
| 25 | 6.7.2 Isometric or trace heater configuration line lists and load charts |
| 26 | 6.8 Power system 6.9 Earthing requirements |
| 27 | 6.10 Earth-fault protection of equipment 6.11 Start-up at minimum ambient temperatures 6.12 Long trace heater runs 6.13 Flow pattern analysis |
| 28 | Figure 3 – Flow pattern analysis example |
| 29 | 6.14 Dead-leg control technique 6.15 Chimney effect Figure 4 – Bypass example |
| 30 | 6.16 Safety shower and eyewash station design requirements 7 Control and monitoring 7.1 General |
| 31 | 7.2 Mechanical controllers 7.3 Electronic controllers 7.4 Application suitability 7.5 Location of controllers |
| 32 | 7.6 Location of sensors 7.7 Alarm considerations 7.7.1 General 7.7.2 Trace heating circuit alarm |
| 33 | 7.7.3 Temperature alarms 7.7.4 Other alarms 7.7.5 Integrated control 8 Recommendations for installation 8.1 General |
| 34 | 8.2 Preparatory work 8.2.1 General 8.2.2 Scheduling and coordination 8.2.3 Confirmation of equipment 8.2.4 Receiving materials 8.2.5 Warehousing and handling 8.2.6 Personnel aspects 8.3 Installation of trace heating circuits 8.3.1 Coordination and equipment verification |
| 35 | 8.3.2 Pre-installation testing and design verification 8.3.3 Visual examination 8.3.4 Insulation resistance test 8.3.5 Component substitution 8.3.6 Location of power supply |
| 36 | 8.3.7 Installation of trace heaters Tables Table 1 – Pre-installation checks |
| 38 | 8.3.8 Connections and terminations |
| 40 | 8.4 Installation of control and monitoring equipment 8.4.1 General 8.4.2 Verification of equipment suitability 8.4.3 Temperature controller and monitoring devices 8.4.4 Sensor considerations |
| 42 | Figure 5 – Typical installation of control sensor and sensor for temperature limiting control Figure 6 – Limiting device sensor on sheath of trace heater |
| 43 | Figure 7 – Limiting device sensor as artificial hot spot |
| 44 | 8.4.5 Controller operation, calibration, and access 8.4.6 Necessary modifications 8.5 Installation of thermal insulation system (see also Clause 5) 8.5.1 General 8.5.2 Preparatory work 8.5.3 Installation of the thermal insulation materials |
| 45 | 8.5.4 Cladding 8.5.5 Field (site work) circuit insulation resistance test 8.5.6 Visual inspection |
| 46 | 8.5.7 Documentation 8.6 Installation of distribution wiring and coordination with branch circuits 8.6.1 General 8.6.2 Earth-fault protective device 8.6.3 Circuit protective device 8.6.4 Tagging/Identification 8.7 Commissioning 8.7.1 Pre-commissioning check |
| 47 | 8.7.2 Functional check and final documentation |
| 48 | 9 Maintenance 9.1 General 9.2 Fault location 9.3 Fault rectification |
| 49 | 10 Repairs 10.1 General 10.2 Practicability of repair to electric trace heaters 10.2.1 Mechanical damage 10.2.2 Damage due to corrosion 10.2.3 Damage due to overheating 10.3 Repair techniques for electrical trace heaters 10.3.1 General |
| 50 | 10.3.2 In-line splice 10.3.3 Connection via junction box 10.4 Earthing 10.5 Testing |
| 51 | Annexes Annex A (informative) Example of design data record Table A.1 – Example of design data record |
| 52 | Annex B (informative) Checklist for installation requirements Table B.1 – Example of pre-commissioning check and trace heater installation record |
| 54 | Annex C (informative) Example of trace heater commissioning record Table C.1 – Example of trace heater commissioning record |
| 56 | Annex D (informative) Example of maintenance schedule and log record Table D.1 – Example of maintenance schedule and log record |
| 58 | Annex E (informative) Pipe heat loss considerations – Heat loss formula and example calculations |
| 59 | Figure E.1 – Assumed temperature gradients |
| 64 | Annex F (informative) Vessel heat loss considerations F.1 General F.2 Insulation heat loss (Qins) |
| 65 | F.3 Slab surface areas (Qslab) F.4 Support heat loss (Qsupt) |
| 66 | F.5 Manhole heat loss (Qmanhole) F.6 Convection coefficient formulae F.6.1 General F.6.2 Free convection, nonfluid surface, any orientation (hi, hco, ho) |
| 67 | F.6.3 Forced convection, any orientation (h0) F.6.4 Radiation component, all coefficients (hf, hi, hco, ho) |
| 69 | Annex G (informative) Heat up and cool down considerations G.1 Heat up |
| 70 | G.2 Cool down |
| 72 | Annex H (informative) Method to determine equivalent thicknesses of insulating cements |
| 73 | Bibliography |
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