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IEEE 60079-30-2-2015

IEEE 60079-30-2-2015

$59.58

IEEE/IEC International Standard for Explosive atmospheres — Part 30-2: Electrical resistance trace heating — Application guide for design, installation and maintenance

Published By Publication Date Number of Pages
IEEE 2015 74
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PDF Pages PDF Title
1 IEC/IEEE 60079-30-2-2015 Front Cover
3 Title page
4 CONTENTS
8 FOREWORD
12 1 Scope
2 Normative references
3 Terms and definitions
4 Application considerations
4.1 General
13 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
14 5 Thermal insulation
5.1 General
5.2 Selection of insulating material
15 5.3 Selection of weather barrier (cladding)
5.4 Selection of economical thickness to provide optimum trace heating design
16 5.5 Double insulation
17 Figures
Figure 1 – Thermal insulation – Weather-barrier installation
18 Figure 2 – Typical temperature profile
19 6 System design
6.1 General
6.2 Purpose of, and major requirement for, trace heating
20 6.3 Training
6.4 Selection of trace heater
6.4.1 General
6.4.2 Site-fabricated trace heaters
21 6.4.3 Specific types of trace heating
6.5 Maximum temperature determination
6.5.1 General
6.5.2 PTC characteristic
22 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
23 6.7.2 Isometric or trace heater configuration line lists and load charts
24 6.8 Power system
6.9 Earthing requirements
25 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
26 Figure 3 – Flow pattern analysis example
27 6.14 Dead-leg control technique
6.15 Chimney effect
Figure 4 – Bypass example
28 6.16 Safety shower and eyewash station design requirements
7 Control and monitoring
7.1 General
29 7.2 Mechanical controllers
7.3 Electronic controllers
7.4 Application suitability
7.5 Location of controllers
30 7.6 Location of sensors
7.7 Alarm considerations
7.7.1 General
7.7.2 Trace heating circuit alarm
31 7.7.3 Temperature alarms
7.7.4 Other alarms
7.7.5 Integrated control
8 Recommendations for installation
8.1 General
32 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
33 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
34 8.3.7 Installation of trace heaters
Tables
Table 1 – Pre-installation checks
36 8.3.8 Connections and terminations
38 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
40 Figure 5 – Typical installation of control sensor and sensor for temperature limiting control
Figure 6 – Limiting device sensor on sheath of trace heater
41 Figure 7 – Limiting device sensor as artificial hot spot
42 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
43 8.5.4 Cladding
8.5.5 Field (site work) circuit insulation resistance test
8.5.6 Visual inspection
44 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
45 8.7.2 Functional check and final documentation
46 9 Maintenance
9.1 General
9.2 Fault location
9.3 Fault rectification
47 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
48 10.3.2 In-line splice
10.3.3 Connection via junction box
10.4 Earthing
10.5 Testing
49 Annexes
Annex A (informative) Example of design data record
Table A.1 – Example of design data record
50 Annex B (informative) Checklist for installation requirements
Table B.1 – Example of pre-commissioning check and trace heater installation record
52 Annex C (informative) Example of trace heater commissioning record
Table C.1 – Example of trace heater commissioning record
54 Annex D (informative) Example of maintenance schedule and log record
Table D.1 – Example of maintenance schedule and log record
56 Annex E (informative) Pipe heat loss considerations – Heat loss formula and example calculations
57 Figure E.1 – Assumed temperature gradients
62 Annex F (informative) Vessel heat loss considerations
F.1 General
F.2 Insulation heat loss (Qins)
63 F.3 Slab surface areas (Qslab)
F.4 Support heat loss (Qsupt)
64 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)
65 F.6.3 Forced convection, any orientation (h0)
F.6.4 Radiation component, all coefficients (hf, hi, hco, ho)
67 Annex G (informative) Heat up and cool down considerations
G.1 Heat up
68 G.2 Cool down
70 Annex H (informative) Method to determine equivalent thicknesses of insulating cements
71 Bibliography

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