IEC 60079-30-2:2007

FOREWORD
1 Scope
2 Normative references
3 Terms and definitions
4 Application considerations
   4.1 General
   4.2 Corrosive areas
   4.3 Process temperature accuracy
   4.4 Installation considerations
5 Thermal insulation
   5.1 General
   5.2 Selection of insulating material
   5.3 Selection of weather barrier (cladding)
   5.4 Selection of economical thickness
   5.5 Double insulation
6 System design
   6.1 Introduction
   6.2 Purpose of, and major requirement for, trace heating
   6.3 Heat loss calculations
   6.4 Heat-up considerations
   6.5 Heat-loss design safety factor
   6.6 Selection of trace heater
   6.7 Maximum temperature determination
   6.8 Design information
   6.9 Power system
   6.10 Start-up at low ambient temperatures
   6.11 Long trace heater runs
   6.12 Flow pattern analysis
   6.13 Dead-leg control technique
   6.14 Chimney effect
7 Control and monitoring
   7.1 General
   7.2 Mechanical controllers
   7.3 Electronic controllers
   7.4 Application suitability
   7.5 Location of controllers
   7.6 Location of sensors
   7.7 Alarm considerations
8 Recommendations for installation
   8.1 Introduction
   8.2 Preparatory work
   8.3 Installation of trace heating circuits
   8.4 Installation of control and monitoring equipment
   8.5 Installation of thermal insulation system
   8.6 Installation of distribution wiring and coordination
        with branch circuits
   8.7 Commissioning
9 Maintenance
   9.1 General
   9.2 Fault location
   9.3 Fault rectification
10 Repairs
   10.1 General
   10.2 Practicability of repair to electric trace heaters
   10.3 Repair techniques for electrical trace heaters
   10.4 Earthing
   10.5 Testing
Figures
Tables

This part of IEC 60079 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 as 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, nor those intended for stress relieving.