GB/T 3836.29-2021 PDF English
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Explosive atmospheres - Part 29: Non-electrical equipment for explosive atmospheres - Constructional safety 'c', control of ignition source 'b', liquid immersion 'k'
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GB/T 3836.29-2021: Explosive atmospheres - Part 29: Non-electrical equipment for explosive atmospheres - Constructional safety 'c', control of ignition source 'b', liquid immersion 'k'
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GB
NATIONAL STANDARD OF THE
PEOPLE’S REPUBLIC OF CHINA
ICS 29.260.20
CCS K 35
Replacing GB 25286.5-2010, GB25286.6-2010, GB 25286.8-2010
Explosive atmospheres – Part 29.Non-electrical
equipment for explosive atmospheres –
Constructional safety “c”, control of ignition source
“b”, liquid immersion “k”
(ISO 80079-37.2016, Explosive atmosphere – Part 37.Non-electrical
equipment for explosive atmospheres – Non electrical type of protection
constructional safety “c”, control of ignition source “b”, liquid immersion “k”
Issued on. OCTOBER 11, 2021
Implemented on. MAY 01, 2022
Issued by. State Administration for Market Regulation;
Standardization Administration of the People’s Republic of
China.
Table of Contents
Foreword... 4
Introduction... 9
1 Scope... 12
2 Normative references... 12
3 Terms and definitions... 13
4 Determination of suitability... 15
5 Requirements for equipment with Type of Protection constructional safety “c”
... 16
6 Requirements for equipment with Type of Protection control of ignition source
“b”... 29
7 Requirements for equipment with Type of Protection liquid immersion “k”.. 36
8 Type tests... 40
9 Documentation... 41
10 Marking... 42
Annex A (Normative) Approach and application. equipment with Type of
Protection “c”... 44
Annex B (Normative) Test requirements... 56
Annex C (Informative) Methodology. equipment with Type of Protection “b”.. 59
Annex D (Informative) Approach to assign the required ignition protection type
used for equipment to achieve different EPL... 60
Annex E (Informative) Information on functional safety concept... 62
Bibliography... 64
1 Scope
This document specifies the requirements for the design and construction of
nonelectrical equipment, intended for use in explosive atmospheres, protected
by the types of protection constructional safety “c”, control of ignition source “b”
and liquid immersion “k”.
This document applies to Ex equipment, Ex components, protection systems,
devices and assemblies of these products, protected by the types of protection
constructional safety “c”, control of ignition source “b” and liquid immersion “k”.
This document supplements and modifies the requirements in GB/T 3836.28-
2021.Where a requirement of this standard conflicts with the requirement of
GB/T 3836.28-2021, the requirement of this standard takes precedence.
Types of Protection “c”, “k” and “b” are not applicable for Group I, EPL Ma
without additional protective precautions.
The types of ignition protection described in the standard can be used either on
their own or in combination with each other to meet the requirements for
equipment of Group I, Group II, and Group III depending on the ignition hazard
assessment in GB/T 3836.28-2021.
2 Normative references
The following documents, in whole or in part, are normatively referenced in this
document and are indispensable for its application. For dated references, only
the edition cited applies. For undated references, the latest edition of the
referenced document (including any amendments) applies.
GB/T 3766, Hydraulic fluid power - General rules and safety requirements
for systems and their components (GB/T 3766-2015, ISO 4413.2010, MOD)
GB/T 3836.1, Explosive atmospheres - Part 1.Equipment - General
requirements (GB/T 3836.1-2021, IEC 60079-0.2017, MOD)
GB/T 3836.26, Explosive atmospheres- Part 26.Electrostatic hazards -
Guidance (GB/T 3836.26-2019, IEC TS 60079-32-1.2013, MOD)
GB/T 3836.28-2021, Explosive atmospheres - Part 28.Non-electrical
equipment for explosive atmospheres - Basic method and requirements (ISO
80079-36.2016, MOD)
3 Terms and definitions
For the purposes of this document, the terms and definitions given in GB/T
3836.28-2021, GB/T 3836.1 and the following apply.
3.1
constructional safety “c”
ignition protection where constructional measures are applied so as to protect
against the possibility of ignition from hot surfaces, sparks and adiabatic
compression generated by moving parts
3.2
mechanical generated sparks
sparks produced by mechanical impact or friction burning particles, as well as
showers of particles, produced by impact or friction between two solid materials
3.4
liquid immersion “k”
type of protection where potential ignition sources are made ineffective or
separated from the explosive atmosphere by either totally immersing them in a
protective liquid, or by partially immersing and continuously coating their active
surfaces with a protective liquid in such a way that an explosive atmosphere
which may be above the liquid, or outside the equipment enclosure, cannot be
ignited
3.4.4
open equipment
equipment that is immersed, or has its components immersed, in a protective
liquid that is open to the external atmosphere
4 Determination of suitability
Before a decision is made to protect equipment or parts of equipment for use
as an assembly, including interconnecting parts, by the measures described in
this standard, it shall have been subjected to the ignition hazard assessment in
accordance with GB/T 3836.28-2021.
5 Requirements for equipment with Type of Protection constructional safety “c”
5.1 General requirements
Equipment designed and constructed according to the applicable safety
requirements of the relevant industrial standards is intended to be capable of
functioning in conformity with the operational parameters established by the
manufacturer, including any mechanical and thermal stresses that they are
intended to be subjected to.
5.2 Ingress protection
5.3 Seals for moving parts
5.3.1 Unlubricated gaskets, seals, sleeves, bellows and diaphragms
Un-lubricated gaskets, seals, sleeves, bellows and diaphragms shall not
become an effective ignition source, e.g., if there is a risk of mechanically
generated sparks and hot surfaces which can become an effective ignition
source. Light metals shall not be used for these parts in this case (see GB/T
3836.28-2021).
5.5 Vibration
Effective ignition sources, hot surfaces or mechanically generated sparks or
loss of protection, caused by vibration shall be avoided. Vibration can arise from
the equipment itself or from the place where it is mounted.
5.6 Requirements for moving parts
5.7 Requirements for bearings
5.7.1 General
Bearings are basically divided into three types, sliding plane motion, sliding
rotary motion and rolling element. When assessing bearings, as part of the
ignition hazard assessment required by GB/T 3836.28-2021, at least the
following shall be considered.
5.7.3 Chemical compatibility
5.8 Requirements for power transmission systems
5.8.1 Gear drives
Gear drives shall comply with the requirements in 5.1.Where the ignition hazard
assessment (see GB/T 3836.28-2021) shows there could still be an ignition
source, another form of ignition protection shall be used (e.g., protection by
liquid immersion, see Clause 7).
Where equipment includes facilities to change the gear ratios (manually, or
automatically), the gear changing mechanisms shall be so arranged as to
ensure that they are incapable of producing either temperatures exceeding the
maximum surface temperature or incendive mechanically generated sparks.
5.8.2 Belt drives
6 Requirements for equipment with Type of Protection
control of ignition source “b”
6.1 General
For application of Type of Protection “b”, control systems are required that are.
6.2 Determination of the control parameters
6.2.1 General
Where the ignition hazard assessment described in GB/T 3836.28-2021 has
revealed potential ignition sources and the manufacturer has decided to reduce
the likelihood of them becoming effective by the application of the protection
described in Clause 6, the equipment manufacturer shall determine, by
calculation or type tests, the control parameters (e.g., temperature, speed,
pressure, etc.) associated with those potential ignition sources.
6.2.2 Determination of the safety critical values
Each safety critical value shall be determined by the manufacturer as that value
above or below which a potential ignition source may become effective. The set
points relevant for control of ignition sources shall be given in the instructions
of the controlled equipment and shall be clearly identified as safety critical.
6.3 Ignition prevention system design and settings
6.3.1 Determining the performance requirements or operating characteristics
The manufacturer shall specify the performance requirements or operating
characteristics (e.g., if the device is a fusible plug) of the ignition prevention
systems / devices intended to be used in the equipment. Examples of the
factors that should be considered are.
6.3.2 Instructions
The performance characteristics of the ignition prevention system specified by
the manufacturer shall be included in the instructions.
7 Requirements for equipment with Type of Protection liquid immersion “k”
7.1 Determination of the maximum / minimum criteria
The manufacturer of the equipment shall determine by calculation and / or by
type testing the following maximum / minimum criteria.
7.2 Protective liquid
The protective liquid used shall be of such viscosity and chemical composition
that it.
7.3 Equipment construction
7.3.5 Level monitoring
Monitoring device(s), indicator(s), or gauge(s) shall be so designed and
constructed that they indicate the actual level.
7.3.6 Loss of liquid
Where there is the possibility of the protective liquid being lost e.g., by
evaporation, capillary or siphon action, the loss shall be avoided or means
provided to replenish the liquid.
8 Type tests
8.1 Type tests for equipment with Type of Protection constructional safety
“c”
See GB/T 3836.28-2021.
8.2 Type tests for equipment with Type of Protection control of ignition
source “b”
8.3 Type tests for equipment with Type of Protection liquid immersion “k”
8.3.1 General
When tested in accordance with 8.3.2 or 8.3.3, no loss of liquid shall occur to
the equipment, which would cause the liquid level to fall below the minimum
criteria determined in Clause 5.The following tests shall be performed without
the equipment operating.
The pressure test is not required for the enclosure in the case of open
equipment.
9 Documentation
9.1 Documentation for equipment with Type of Protection constructional
safety “c”
9.2 Documentation for equipment with Type of Protection control of
ignition sources “b”
9.3 Documentation for equipment with Type of Protection liquid
immersion “k”
......
Source: Above contents are excerpted from the full-copy PDF -- translated/reviewed by: www.ChineseStandard.net / Wayne Zheng et al.
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