GB 3836.14-2014Explosive atmospheres—Part 14: Classification of areas—Explosive gas atmosphere (English PDF)

Foreword

All technical content of this Part is mandatory.

GB 3836 "Explosive atmospheres" is divided into the following parts.

- Part 1.Equipment - General requirements;

- Part 2.Equipment protection by flameproof enclosures "d";

- Part 3.Equipment protection by increased safety e;

- Part 4.Equipment protection by intrinsic safety i;

- Part 5.Equipment protection by pressurized enclosure "p";

- Part 6.Equipment protection by liquid immersion "o";

- Part 7.Equipment protection by powder filling "q";

- Part 8.Equipment protection by type of protection "n";

- Part 9.Equipment protection by type of protection "m";

- Part 11.Material characteristics for gas and vapour classification - Test

methods and data;

- Part 12.Classification of gases or vapours with air according to their

maximum experimental safe gaps and minimum igniting current;

- Part 13.Equipment repair, overhaul and reclamation;

- Part 14.Classification of areas - Explosive gas atmosphere;

- Part 15.Electrical installations design, selection and erection;

- Part 16.Electrical installations inspection and maintenance;

- Part 17.Construction and use of rooms or buildings protected by

pressurization;

- Part 18.Intrinsically safe electrical systems;

- Part 19.Fieldbus intrinsically safe concept (FISCO);

- Part 20.Equipment with equipment protection level (EPL) Ga.

This Part is drafted in accordance with the rules given in GB/T 1.1-2009.

This Part is Part 14 of GB 3836.

This Part replaces GB 3836.14-2000 "Electrical apparatus for explosive gas

atmospheres - Part 14.Classification of hazardous areas". Compared with GB

3836.14-2000, the main technical changes are as follows.

- ADD explosion hazard of flammable mist released by high flash point liquids

under pressure (see Annex D);

- In the release rate, give many thermodynamic calculation equations for the

estimation of the release rate of liquids and gases (see A.3).

This Part, using translation method, is identical to IEC 60079-10-1.2008

"Explosive atmospheres - Part 10-1.Classification of areas - Explosive gas

atmosphere" (English edition).

This Part was proposed by China Electrical Equipment Industry Association.

This Part shall be under the jurisdiction of National Technical Committee 9 on

Explosion Protected Electrical Apparatus of Standardization Administration of

China (SAC/TC 9).

Main drafting organizations of this Part. Nanyang Explosion Protected Electrical

Apparatus Research Institute, China National Quality Supervision and Test

Centre for Explosion Protected Electrical Products, Helon Explosion-proof

Electric Co., Ltd., Shenzhen Jinming Technology Co., Ltd., Sunleem

Technology Incorporated Company, Dianguang Explosion Protection Electric

Co., Ltd., SINOPEC Research Institute of Safety Engineering.

Main drafters of this Part. Wang Jun, Xie Shaojian, Wu Xudong, Zheng

Zhenxiao, Shi Xiaoxian, Li Xiaoning, Zhang Weihua, Zhao Hongyu.

The previous editions of the standard replaced by this Part were released as

follows.

- GB 3836.14-2000.

1 Scope

This Part of GB 3836 is concerned with the classification of areas where

flammable gas or vapour or mist hazards (see Notes 1, 2 and 3) may arise and

may then be used as a basis to support the proper selection and installation of

electrical equipment for use in a hazardous area.

2 Normative references

The following documents are indispensable for the application of this document.

For the dated references, only the editions with the dates indicated are

applicable to this document. For the undated references, the latest edition

(including all the amendments) are applicable to this document.

GB/T 2900.35-2008 Electrotechnical terminology - Equipment for explosive

atmospheres [IEC 60050(426).2008, IDT]

3 Terms and definitions

For the purposes of this document, the terms and definitions given in GB

3836.1-2010 and the following apply.

4 General

Subsequent to the completion of the area classification, a risk assessment may

be carried out to assess whether the consequences of ignition of an explosive

atmosphere requires the use of equipment of a higher equipment protection

level (EPL) or may justify the use of equipment with a lower equipment

protection level than normally required.

5 Area classification procedure

The basic elements for establishing the hazardous zone types are the

identification of the source of release and the determination of the grade of

release.

6 Ventilation

Ventilation can be accomplished by the movement of air due to the wind and/or

by temperature gradients or by artificial means such as fans. So, two main types

of ventilation are thus recognized.

The availability of ventilation has an influence on the presence or formation of

an explosive gas atmosphere and thus also on the type of zone.

7 Documentation

Where the topography of an area influences the extent of the zones, this should

be documented.

Annex A

(Informative)

Examples of sources of release

The following examples are not intended to be rigidly applied and may need to

be varied to suit particular process equipment and situations. It needs to be

recognised that some equipment may exhibit more than one grade of release.

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