GB/T 3836.28-2021Explosive atmospheres - Part 28: Non-electrical equipment for explosive atmospheres - Basic method and requirements (English PDF)

Foreword

This Standard was drafted in accordance with the rules given in GB/T 1.1-2020

"Directives for standardization - Part 1: Rules for the structure and drafting of

standardizing documents".

This Standard is Part 28 of GB/T 3836 "Explosive atmospheres". The following

parts of GB/T 3836 have been issued:

- 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 encapsulation "m";

- Part 11: Material characteristics for gas and vapor classification - Test

methods and data;

- Part 12: Material characteristics for combustible dusts - Test methods;

- Part 13: Equipment repair, overhaul, reclamation and modification;

- Part 14: Classification of hazardous areas;

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

- Part 16: Inspection and maintenance of electrical installation (other than

mines);

- Part 17: Construction and use of rooms or building protected by

pressurization;

- Part 18: Intrinsically safe system;

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

- Part 21: Application of quality systems for equipment manufacture;

- Part 22: Protection of equipment and transmission system using optical

radiation;

- Part 23: Group I, category EPL Ma equipment intended to remain functional

in atmospheres endangered by firedamp and/or coal dust;

- Part 24: Equipment protection by special protection "s";

- Part 25: Requirements for process sealing between flammable process

fluids and electrical systems;

- Part 26: Electrostatic hazards - Guidance;

- Part 27: Electrostatic hazards - Test;

- Part 28: Non-electrical equipment for explosive atmospheres - Basic

method and requirements;

- Part 29: Non-electrical equipment for explosive atmospheres -

Constructional safety "c", control of ignition source "b", liquid immersion

"k";

- Part 30: Equipment and components in explosive atmospheres in

underground mines;

- Part 31: Equipment dust ignition protection by enclosure "t";

- Part 32: Intrinsically safe systems with electronically controlled spark

duration limitation;

- Part 33: Equipment in adverse service conditions;

- Part 34: Equipment assembly;

- Part 35: Classification of areas for explosive dust atmospheres.

This Standard replaces GB 25286.1-2010 "Non-electrical equipment for

potentially explosive atmospheres - Part 1: Basic method and requirements".

Compared with GB 25286.1-2010, in addition to structural adjustments and

editorial changes, the main technical changes in this Standard are as follows:

- changed the supplementary standards of this Standard (see Clause 1;

Clause 1 of GB 25286.1-2010);

- added the use of explosion-proof type "d", "p", "t" (see Clause 1 and Annex

A);

- added the applicability of corresponding clauses in GB/T 3836.1-2021 (see

Table 1);

- added the assessment and control methods for possible ignition sources

(see Clause 6);

- changed the requirements for verification and testing (see Clause 8; Clause

13 of GB 25286.1-2010);

- added the document requirements (see Clause 9);

- changed the requirements for marks (see Clause 11; Clause of GB

25286.1-2010).

This Standard uses redrafting method to modify and adopt ISO 80079-36:2016

"Explosive atmospheres - Part 36: Non-electrical equipment for explosive

atmospheres - Basic method and requirements".

Compared with ISO 80079-36:2016, the structural adjustments in this Standard

are as follows:

- Annex A corresponds to Annex G of ISO 80079-36:2016;

- Annex C corresponds to Annex I of ISO 80079-36:2016;

- Annex D corresponds to Annex A of ISO 80079-36:2016;

- Annex F corresponds to Annex C of ISO 80079-36:2016;

- Annex G corresponds to Annex H of ISO 80079-36:2016;

- Annex H corresponds to Annex F of ISO 80079-36:2016;

- deleted Annex D of ISO 80079-36:2016.

The technical differences between this Standard and ISO 80079-36:2016 and

the reasons are as follows:

- Regarding normative reference documents, this Standard has been

adjusted with technical differences to adapt to Chinese technical

conditions. The adjustments are collectively reflected in Clause 2

"Normative references", and the specific adjustments are as follows:

* Use GB/T 3836.1-2021 that adopts IEC 60079-0 to replace IEC 60079-

0 (see Clause 1);

* Use GB/T 3836.2 that adopts IEC60079-1 to replace IEC60079-1 (see

Clause 1);

* Use GB/T 3836.5 that adopts IEC 60079-2 to replace IEC 60079-2 (see

Clause 1);

* Use GB/T 3836.22 that adopts IEC 60079-28 to replace IEC 60079-28

(see 6.2.5.1);

* Use GB/T 3836.31 that adopts IEC 60079-31 to replace IEC 60079-31

(see Clause 1);

* Use GB/T 3836.29 that adopts ISO 80079-37 to replace ISO 80079-37

(see Clause 1);

* Use GB/T 3836.30 that adopts ISO/IEC 80079-38 to replace ISO/IEC

80079-38 (see 6.4.2.1);

* Delete ANSI/UL 746B and move to Bibliography.

- Modified the file version in Table 1 to be consistent with GB/T 3836.1-2021;

- Deleted the electrification test in Annex D of ISO 80079-36:2016; In the text,

use the test 26.17 and Table 10 of GB/T 3836.1-2021 to keep consistent

with GB/T 3836.1-2021.

This Standard made the following editorial modifications:

- To be consistent with the existing standard series, the name of this Standard

is revised to "Explosive atmospheres - Part 28: Non-electrical equipment

for explosive atmospheres - Basic method and requirements";

- In Clause 1, added the description of the scope of application of this

Standard;

- Deleted the note on the standard version information in Table 1;

- In 4.1, added the note about Annex C;

- In 4.4, added the note about the reclassification of Class III equipment;

- Deleted the note about replacing the separator "." in 11.2;

- In 6.4.2.1, the footnote on hard steel and non-sparking metal is replaced by

a note;

- Included the technical errata content of ISO 80079-36:2016/COR1:2019;

The position of the outer margin of the involved clause is marked with a

vertical double line (||);

- modified the Bibliography.

Attention is drawn to the possibility that some of the elements of this Standard

may be the subject of patent rights. The issuing authority shall not be held

responsible for identifying any or all such patent rights.

Explosive atmospheres - Part 28: Non-electrical

equipment for explosive atmospheres - Basic method

and requirements

1 Scope

This Standard specifies the basic methods and requirements for the design,

structure, testing and marking of non-electrical equipment used in explosive

atmospheres.

This Standard applies to non-electrical Ex equipment, Ex components,

protective systems, devices and assemblies of these products that have their

own potential ignition sources used in explosive atmospheres.

Hand tools and manually operated equipment without energy storage are

excluded from the scope of this Standard. This Standard does not address the

safety of static autonomous process equipment when it is not part of equipment

referred to in this Standard.

NOTE 1: Static autonomous process equipment includes items such as tanks, vessels,

fixed pipework and hand operated valves which do not have their own source of energy

that could create a potential ignition source during operation.

This Standard does not specify requirements for safety, other than those directly

related to the risk of ignition which may then lead to an explosion.

The standard atmospheric conditions (relating to the explosion characteristics

of the atmosphere) under which it may be assumed that Ex equipment can be

operated are:

- temperature: -20°C ~ +60°C;

- pressure: 80 kPa~110 kPa;

- air with normal oxygen content, typically 21% (volume fraction).

Such atmospheres can also exist inside the equipment. In addition, the external

atmosphere can be drawn inside the equipment by natural breathing produced

as a result of fluctuations in the equipment's internal operating pressure, and/or

temperature.

NOTE 2: Although the standard atmospheric conditions above give a temperature range

for the atmosphere of -20°C ~ +60°C, the normal ambient temperature range for Ex

equipment is -20°C ~ +40°C, unless otherwise specified and marked. It is considered that

-20°C ~ +40°C is appropriate for most Ex equipment and that to manufacture all equipment

to be suitable for a standard atmosphere upper ambient temperature of +60°C would place

unnecessary design constraints.

NOTE 3: The requirements of this Standard can also be helpful for the design, construction,

testing and marking of equipment intended for use in atmospheres outside the validity

range stated above. In this case however, the ignition hazard assessment, ignition

protection provided, additional testing (if necessary), manufacturer's technical

documentation and instructions to the user, clearly demonstrate and indicate the

equipment's suitability for the conditions it may encounter. It is also recognized that

changes in temperature and pressure can have a significant influence on characteristics of

the explosive atmosphere, such as ignitability.

This Standard specifies the requirements for the design and construction of

equipment, intended for explosive atmospheres in conformity with all

Equipment Protection Levels (all EPLs) of Group I, II and III.

NOTE 4: It is not unusual for equipment designed and constructed in accordance with this

Standard for a particular EPL to be used in areas requiring an EPL with a higher level of

safety by including the application of additional measures. Such measures include for

example inerting, suppression, venting or containment or for example by dilution, drainage,

monitoring and shut-down. Such measures are outside the scope of this Standard.

This Standard supplements and modifies the general requirements of GB/T

3836.1-2021, as shown in Table 1. Where a requirement of this Standard

conflicts with a requirement of GB/T 3836.1-2021, as far as applicable for non-

electrical equipment, the requirement of this Standard takes precedence.

This Standard is supplemented or modified by the following standards

concerning specific types of protection:

- GB/T 3836.29, Explosive atmospheres - Part 29: Non-electrical equipment

for explosive atmospheres - Constructional safety "c", control of ignition

source "b", liquid immersion "k";

- GB/T 3836.2, Explosive atmospheres - Part 2: Equipment protection by

flameproof enclosures "d";

- GB/T 3836.5, Explosive atmospheres - Part 5: Equipment protection by

pressurized enclosure "p";

- GB/T 3836.31, Explosive atmospheres - Part 31: Equipment dust ignition

protection by enclosure "t".

The nature and ignition sources of non-electrical equipment shall be considered

......