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GB/T 19518.2-2026Explosive atmospheres - Electrical resistance traces heating - Part 2: Application guide for design, installation and maintenance (English PDF)

爆炸性环境电阻式伴热器第2部分：设计、安装和维护应用导则

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Issued by

State Administration for Market Regulation

Level / Type

National · Recommended

Issue date

March 31, 2026

Implementation date

October 1, 2026

Scope

GB/T 19518.2-2026 is the English-translated version of 爆炸性环境电阻式伴热器第2部分：设计、安装和维护应用导则.

GB/T 19518.2-2026 — This document specifies the locations where explosions may occur, except for areas requiring an Equipment Protection Level (EPL) of Ga/Da (related to Zones 0 and 20).

Application rules for resistance heating systems in explosive environments. This document applies to the design, installation, maintenance, and repair of resistance heat tracing systems and associated control and monitoring devices.

This document does not apply to... It is not suitable for devices that operate by induction heating, skin effect or direct pipeline heating, nor for devices intended for stress relief.

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Document preview — GB/T 19518.2-2026

National Standard of the People's Republic of China

ICS: 29.260.20
Classification: K 35
Replacing: GB/T 19518.2-2017

Issued by: State Administration for Market Regulation

Preface
Introduction
1 Scope
2 Normative References
3 Terms and Definitions
4 Usage conditions
4.1 General Rules
4.2 Corrosive Area
4.3 Process temperature accuracy
4.4 Installation Conditions
5 Insulation 2.
5.1 General Rules
5.2 Selection of Thermal Insulation Materials
5.3 Selection of Climate Protection Layer (Climate Protection Layer)
5.4 Optimal Heat Tracing Design Thickness for Economical Selection
5.5 Double-layer insulation
6 System Design
6.1 General Rules
6.2 Applications and Main Requirements of Heat Tracing Equipment
6.3 Training
6.4 Selection of Heat Tracing Equipment
6.5 Determination of the maximum temperature
6.6 Heating and Cooling Precautions
6.7 Design Information
6.8 Power Supply System
6.9 Grounding requirements
6.10 Equipment grounding fault protection
6.11 Start at minimum ambient temperature for 10 seconds
6.12 When the tracing heat is relatively long,
6.13 Manifold Analysis
6.14 Blind pipe control method
6.15 Chimney Effect
6.16 Safety Shower and Washbasin Design Requirements
7 Control and monitoring
7.1 General Rules
7.2 Mechanical controller
7.3 Electronic Controller
7.4 Applicability of the Application
7.5 Controller Location
7.6 Sensor Position
7.7 Alarm Precautions
8 Install
8.1 General Rules
8.2 Preparations
8.3 Installation of heat tracing circuit
8.4 Installation of Control and Monitoring Devices
8.5 Installation of the insulation system (see also Chapter 5)
8.6 Wiring installation and coordination with branch circuits
8.7 Debugging
9 Maintenance
9.1 General Rule
9.2 Fault Location
9.3 Troubleshooting
10 Repair
10.1 General Rule
10.2 General methods for repairing heat tracing equipment
10.3 Repair Techniques for Heat Tracing Equipment
10.4 Grounding
10.5 Experiment
Appendix A (Informative) Method for Determining the Equivalent Thickness of Thermal Insulation Mortar
Appendix B (Informative) Example 30 of Design Data Recording
Appendix C (Informative) Precautions for Piping Heat Loss---Heat Loss Formulas and Calculation Examples
Appendix D (Informative) Precautions for Heat Loss in Containers
Appendix E (Informative) Heating and Cooling Precautions
Appendix F (Informative) Installation Requirements Checklist
Appendix G (Informative) Example 45 of Heat Tracer Commissioning Record
Appendix H (Informative) Example 47 of Maintenance and Operation Log
References

Foreword

This document complies with the provisions of GB/T 1.1-2020 "Standardization Work Guidelines Part 1: Structure and Drafting Rules of Standardization Documents".

Drafting.

This document is Part 2 of GB/T 19518 "Resistance Heat Tracing for Explosive Atmospheres". GB/T 19518 has published the following...

part.

---Part 1: General and Testing Requirements;

---Part 2: Design, Installation and Maintenance Application Guidelines this document replaces GB/T 19518.2-2017 "Resistance Heat Tracing for Explosive Atmospheres - Part 2: Design, Installation and Maintenance Guidelines" Compared with GB/T 19518.2-2017, the main technical changes in "South" are as follows, except for structural adjustments and editorial modifications.

---The heat loss design has been removed (see 6.3 in the 2017 edition);

---The system evaluation under equilibrium conditions has been removed (see 6.6.2 in the 2017 version);

---Added design requirements for safety showers and eyewash stations (see 6.16);

---The calculation of the theoretical temperature of the sheath has been removed (see 6.7.4~6.7.5 in the 2017 edition).

This document is modified to adopt IEC/IEEE 60079-30-2.2015 "Explosive Atmospheres - Part 30-2.Design and Safety of Resistance Heat Tracing Devices".

Installation and maintenance application guidelines.

This document has undergone the following structural adjustments compared to IEC/IEEE 60079-30-2.2015.

---Appendix A corresponds to Appendix H of IEC/IEEE 60079-30-2.2015;

---Appendix B corresponds to Appendix A of IEC/IEEE 60079-30-2.2015;

---Appendix C corresponds to Appendix E of IEC/IEEE 60079-30-2.2015;

---Appendix D corresponds to Appendix F of IEC/IEEE 60079-30-2.2015;

---Appendix E corresponds to Appendix G of IEC/IEEE 60079-30-2.2015;

---Appendix F corresponds to Appendix B of IEC/IEEE 60079-30-2.2015;

---Appendix G corresponds to Appendix C of IEC/IEEE 60079-30-2.2015;

---Appendix H corresponds to Appendix D of IEC/IEEE 60079-30-2.2015.

The technical differences between this document and IEC/IEEE 60079-30-2.2015, and the reasons therefor, are as follows.

---IEC 60050-426 (see Chapter 3) has been replaced with the normatively referenced GB/T 2900.35 to adapt to my country's technical conditions.

Increase operability;

---IEC 60079-0 (see Chapter 3) has been replaced with the normatively referenced GB/T 3836.1 to adapt to my country's technical conditions and add...

Operability;

---IEC 60079-15 (see 8.3.7.4) has been replaced with the normatively referenced GB/T 3836.3 to adapt to my country's technical conditions and increase...

Increase operability;

---IEC 60079-30-1 (see Chapters 3, 6, and 8) has been replaced with the normatively referenced GB/T 19518.1 to suit my needs.

Improve the country's technical conditions and increase operability;

---The content regarding the classification method of "section" locations has been deleted (see Chapter 1, 4.1), making it consistent with the classification method of explosion-hazardous locations in my country.

The following editorial changes have been made to this document.

---To harmonize with existing standards, the standard title has been changed to "Resistant Heat Tracing in Explosive Atmospheres - Part 2: Design and Installation" Application and Maintenance Guidelines;

---The note regarding the classification method of "segment" locations in the "Scope" chapter has been deleted;

--- Replace Celsius (°C) with Kelvin (K) in units such as heat transfer coefficient, thermal conductivity, and specific heat capacity;

---The international documents cited in the information have been replaced with our own documents.

Please note that some content in this document may involve patents. The issuing organization of this document assumes no responsibility for identifying patents.

This document was proposed by the China Electrical Equipment Industry Association.

This document is under the jurisdiction of the National Technical Committee on Standardization of Explosion-proof Electrical Equipment (SAC/TC9).

Introduction

GB/T 19518 "Resistance Heat Tracing for Explosive Atmospheres" aims to establish the basic requirements for resistance heat tracing equipment used in explosive atmospheres.

These requirements and their application rules are in the form of a partial standard, including the following parts.

---Part 1: General and Test Requirements. The purpose is to establish the general requirements and test requirements for resistance heat tracing devices used in explosive atmospheres.

method.

---Part 2: Design, Installation, and Maintenance Application Guidelines. The purpose is to establish guidelines for the design and installation of resistance heat tracing systems in explosive atmospheres.

Rules for maintaining applications.

Electric heat tracing systems are widely used in explosive hazardous locations in industries such as petroleum and chemical manufacturing. Regarding the standardization of such equipment, my country...

In.2004, the IEC 62086 series was adopted to establish general requirements and test methods for electric heat tracing in explosive gas atmospheres.

GB 19518.1-2004 and GB/T 19518.2-2004 concerning the design, installation and maintenance of electric heat tracing, were subsequently adopted in 2017.

The IEC 60079-30 series has been revised. Since the 2017 edition of the standard was released and implemented, there have been some new developments in the design and testing technologies of electric heat tracing systems.

The exhibition has also raised new requirements for its application. Regarding international standards, the current versions of the relevant standards are IEC/IEEE 60079-30-1.2015 and...

IEC/IEEE 60079-30-2.2015, its main technical content is applicable to my country's situation. To adapt to the development of explosion-proof technology and industry, and to align with international standards...

To align with development, the GB/T 19518 series needs to be revised.

This revision of the document adopts IEC/IEEE 60079-30-2.2015 "Explosive atmospheres – Part 30-2.Resistance heat tracing".

Based on the main technical content of the "Design, Installation and Maintenance Application Guidelines", appropriate modifications have been made to suit my country's situation.

Resistance heat tracing in explosive atmospheres Part 2: Design, Installation and Maintenance Application Guidelines

1 Scope

This document specifies the locations where explosions may occur, except for areas requiring an Equipment Protection Level (EPL) of Ga/Da (related to Zones 0 and 20).

Application rules for resistance heating systems in explosive environments.

This document applies to the design, installation, maintenance, and repair of resistance heat tracing systems and associated control and monitoring devices. This document does not apply to...

It is not suitable for devices that operate by induction heating, skin effect or direct pipeline heating, nor for devices intended for stress relief.

2 Normative references

The contents of the following documents, through normative references within the text, constitute essential provisions of this document. Dated citations are not included.

For references to documents, only the version corresponding to that date applies to this document; for undated references, the latest version (including all amendments) applies.

This document.

GB/T 2900.35 Electrical terminology - Explosive atmospheres (GB/T 2900.35-2023, IEC 60050-426:2020, IDT) GB/T 3836.1 Explosive Atmospheres – Part 1: Equipment – General Requirements (GB/T 3836.1-2021, IEC 60079-0) 2017, MOD) GB/T 3836.3 Explosive Atmospheres – Part 3: Equipment protected by increased safety "e" (GB/T 3836.3-2021, IEC 60079-7) 2015, MOD) GB/T 19518.1 Resistance Heat Tracing Equipment for Explosive Atmospheres - Part 1: General and Test Requirements (GB/T 19518.1-2024, IEC 60079-30-1:2015, MOD)

3 Terms and Definitions

The terms and definitions defined in GB/T 3836.1, GB/T 19518.1 and GB/T 2900.35 apply to this document.

4 Usage conditions

4.1 General Rules

This document is a supplement to the requirements of GB 3836.15, GB 3836.16 and GB/T 19518.1.

If the heat tracing system is installed in an explosive atmosphere, a detailed classification of the hazardous location should be specified. This specification should state the required equipment protection level.

Differentiate Gb/Gc/Db/Dc (corresponding to Zone 1/Zone 2/Zone 21/Zone 22 respectively), gas or dust classification, and temperature group. Under special conditions...

If the operating conditions or on-site conditions may be particularly harsh, then these conditions should be specified in the technical specifications of the heat tracing equipment.

If the heat tracing system is installed on mobile equipment or a skid (e.g., a repositionable structure), the system should be designed to accommodate it.

Potential disadvantages.

If certain components of the heat tracing system may be exposed to the environment, then those components should be suitable for such environments.

4.2 Corrosive Areas

All components of the electric heat tracing system should be inspected to verify their durability against any corrosive materials they may encounter during the system's service life.

......
This preview omits tables, figures, formulas and parts of the technical clauses. The complete document — 49 pages — is available in the English PDF.

Referenced standards

Normative references

IEC 60050 · IEC 60079

Cited by

GB/T 3836.13-2021Explosive atmospheres - Part 13: Equipment repair, overhaul, reclamation and modification

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