IEC/IEEE 62395-2:2024
(Main)Electrical resistance trace heating systems for industrial and commercial applications - Part 2: Application guide for system design, installation and maintenance
Electrical resistance trace heating systems for industrial and commercial applications - Part 2: Application guide for system design, installation and maintenance
IEC/IEEE 62395-2:2024 provides detailed recommendations for the system design, installation, maintenance and repair of electrical resistance trace heating systems in industrial and commercial applications. This document does not include or provide for any applications in potentially explosive atmospheres.
This standard cancels and replaces IEC 62395-2:2013. This edition constitutes a technical revision.
This standard includes the following significant technical changes with respect to IEC 62395-2:2013:
a) Design considerations for trace heating on sprinkler systems have been expanded and a figure has been added to illustrate how to avoid undue shadowing of spray patterns from insulated sprigs close to sprinkler heads;
b) Specific details of design considerations for trace heating for emergency eyewash units and safety showers have been added.
This document is published as an IEC/IEEE Dual Logo standard.
Systèmes de traçage par résistance électrique pour applications industrielles et commerciales - Partie 2: Guide d'application pour la conception, l'installation et la maintenance du système
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IEC/IEEE 62395-2 ®
Edition 1.0 2024-06
INTERNATIONAL
STANDARD
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Electrical resistance trace heating systems for industrial and commercial
applications –
Part 2: Application guide for system design, installation and maintenance
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IEC/IEEE 62395-2 ®
Edition 1.0 2024-06
INTERNATIONAL
STANDARD
colour
inside
Electrical resistance trace heating systems for industrial and commercial
applications –
Part 2: Application guide for system design, installation and maintenance
INTERNATIONAL
ELECTROTECHNICAL
COMMISSION
ICS 25.180.10 ISBN 978-2-8322-8826-9
– 2 – IEC/IEEE 62395-2:2024 © IEC/IEEE 2024
CONTENTS
FOREWORD . 7
INTRODUCTION . 9
1 Scope . 10
2 Normative references . 11
3 Terms and definitions . 11
4 Surface heating of vessels and piping systems . 11
4.1 Application description . 11
4.1.1 General . 11
4.1.2 Environmental conditions . 11
4.1.3 Trace heating systems considerations . 12
4.2 Design information – General . 12
4.2.1 General . 12
4.2.2 Electrical system design . 12
4.2.3 Control and monitoring . 13
4.2.4 Trace heating system design . 14
4.2.5 Design information documentation . 14
4.3 Thermal system design . 14
4.3.1 General . 14
4.3.2 Design conditions . 15
4.3.3 Thermal insulation . 15
4.3.4 Heat loss determination . 19
4.3.5 Design safety factor . 21
4.3.6 Heat-up considerations . 21
4.3.7 Selection of trace heater . 22
4.3.8 Design calculations . 25
4.3.9 Theoretical sheath temperature calculations – Metallic pipe applications . 25
4.3.10 Theoretical sheath temperature calculations – Non-metallic pipe
applications . 26
4.3.11 Design documentation . 27
4.3.12 Start-up at low ambient temperatures . 28
4.3.13 Long trace heater circuits . 28
4.3.14 Chimney effect . 28
4.4 Electrical design . 28
4.5 Control and monitoring system design . 29
4.5.1 General . 29
4.5.2 Mechanical temperature controllers . 29
4.5.3 Electronic temperature controllers . 29
4.5.4 Application suitability . 30
4.5.5 Location of controllers . 31
4.5.6 Location of sensors . 31
4.5.7 Alarm considerations . 32
4.5.8 Integrated control . 33
4.5.9 Flow pattern analysis . 33
4.5.10 Dead-leg control technique . 35
4.5.11 Monitoring requirements for fire sprinkler systems . 35
4.6 Special design considerations . 35
4.6.1 General . 35
4.6.2 Freeze protection systems . 35
4.6.3 Sprinkler systems, fire suppression. 36
4.6.4 Hot water services/tempered water . 37
4.6.5 Safety shower design requirements . 38
4.6.6 Specialty lines . 38
4.7 Installation . 40
4.7.1 General . 40
4.7.2 Personnel aspects . 40
4.7.3 Preparatory work . 41
4.7.4 Preliminary installation of trace heating circuits . 41
4.7.5 Pre-installation insulation resistance test . 41
4.7.6 Installation of trace heater systems . 42
4.7.7 Installation of control and monitoring equipment . 44
4.7.8 Necessary modifications . 45
4.7.9 Installation of the thermal insulation system . 45
4.7.10 Installation of electrical power . 47
4.7.11 Commissioning . 47
4.8 Maintenance . 48
4.8.1 General . 48
4.8.2 Training of maintenance personnel . 49
4.8.3 Frequency of inspection . 49
4.8.4 Maintenance program documentation . 49
4.8.5 Visual evaluation . 49
4.8.6 Electrical evaluation. 50
4.8.7 Review of the electrical protection system . 50
4.9 Repair . 50
4.9.1 General . 50
4.9.2 Fault location . 50
4.9.3 Practicability of repair to electric trace heaters . 51
4.9.4 Repair techniques for electrical trace heaters . 51
5 Roof and gutter deicing . 52
5.1 Application description . 52
5.2 Design information – General . 52
5.3 Thermal design . 53
5.4 Electrical design . 53
5.5 Control and monitoring system design . 53
5.6 Special design considerations . 54
5.7 Installation . 54
5.7.1 General . 54
5.7.2 Trace heaters and component mounting . 54
5.8 Maintenance . 57
5.9 Repair . 57
6 Rail heating . 57
6.1 Application description . 57
6.1.1 General . 57
6.1.2 Switch point heating9 .
...
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