AS/NZS 60079.30.2:2007

1 - AS/NZS 60079.30.2:2007 Explosive atmospheres Part 30.2: Electrical resistance trace heating„Application guide for design, ins
4 - PREFACE
5 - CONTENTS
7 - 1 Scope
7 - 2 Normative references
8 - 3 Terms and definitions
8 - 4 Application considerations
8 - 4.1 General
9 - 4.2 Corrosive areas
9 - 4.3 Process temperature accuracy
9 - 4.4 Installation considerations
10 - 5 Thermal insulation
10 - 5.1 General
10 - 5.2 Selection of insulating material
11 - 5.3 Selection of weather barrier (cladding)
12 - 5.4 Selection of economical thickness
13 - 5.5 Double insulation
14 - 6 System design
14 - 6.1 Introduction
14 - 6.2 Purpose of, and major requirement for, trace heating
14 - 6.3 Heat loss calculations
16 - 6.4 Heat-up considerations
17 - 6.5 Heat-loss design safety factor
17 - 6.6 Selection of trace heater
21 - 6.7 Maximum temperature determination
24 - 6.8 Design information
25 - 6.9 Power system
25 - 6.10 Start-up at low ambient temperatures
25 - 6.11 Long trace heater runs
25 - 6.12 Flow pattern analysis
27 - 6.13 Dead-leg control technique
27 - 6.14 Chimney effect
28 - 7 Control and monitoring
28 - 7.1 General
28 - 7.2 Mechanical controllers
28 - 7.3 Electronic controllers
28 - 7.4 Application suitability
29 - 7.5 Location of controllers
29 - 7.6 Location of sensors
30 - 7.7 Alarm considerations
31 - 8 Recommendations for installation
31 - 8.1 Introduction
31 - 8.2 Preparatory work
32 - 8.3 Installation of trace heating circuits
38 - 8.4 Installation of control and monitoring equipment
42 - 8.5 Installation of thermal insulation system (see also Clause 5)
44 - 8.6 Installation of distribution wiring and coordination with branch circuits
44 - 8.7 Commissioning
46 - 9 Maintenance
46 - 9.1 General
46 - 9.2 Fault location
46 - 9.3 Fault rectification
46 - 10 Repairs
46 - 10.1 General
47 - 10.2 Practicability of repair to electric trace heaters
47 - 10.3 Repair techniques for electrical trace heaters
48 - 10.4 Earthing
48 - 10.5 Testing
51 - Annex ZZ (normative) Variations to IEC 60079-30-2, Ed.1.0 (2007) for application in Australia and New Zealand

Provides guidance for the application of electrical resistance trace heating systems in areas where explosive gas atmospheres may be present, with the exception of those classified in zone 0. It provides recommendations for the design, installation, maintenance and repair of trace heating equipment and associated control and monitoring equipment. It does not cover devices that operate by induction heating, skin effect heating or direct pipeline heating, not those intended for stress relieving.

Originated as AS/NZS 62086.2:2002.
Revised and redesignated as AS/NZS 60079.30.2:2007.