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GB 25286.8-2010: Non-electrical equipment for potentially explosive atmospheres -- Part 8: Protection by liquid immersion “k”
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Non-electrical equipment for potentially explosive atmospheres -- Part 8: Protection by liquid immersion “k”
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Basic data | Standard ID | GB 25286.8-2010 (GB25286.8-2010) | | Description (Translated English) | Non-electrical equipment for potentially explosive atmospheres -- Part 8: Protection by liquid immersion ��k�� | | Sector / Industry | National Standard | | Classification of Chinese Standard | K35 | | Classification of International Standard | 29.260.20 | | Word Count Estimation | 8,833 | | Date of Issue | 2010-11-10 | | Date of Implementation | 2011-09-01 | | Quoted Standard | GB 4208-2008; GB 25286.1-2010 | | Adopted Standard | EN 13463-8-2003, MOD | | Regulation (derived from) | Announcement of Newly Approved National Standards 2010 No. 8 (No. 163 overall) | | Issuing agency(ies) | General Administration of Quality Supervision, Inspection and Quarantine of the People's Republic of China, Standardization Administration of the People's Republic of China | | Summary | This Chinese standard specifies the use of different levels of immersion -type"k"as prevent potential ignition source becomes effective ignition source protection equipment design, construction, testing and marking requirements. | GB 25286.8-2010: Non-electrical equipment for potentially explosive atmospheres -- Part 8: Protection by liquid immersion “k”
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Non-electrical equipment for potentially explosive atmospheres.Part 8. Protection by liquid immersion "k"
ICS 29.260.20
K35
National Standards of People's Republic of China
Non-electrical equipment for explosive atmospheres
Part 8. liquid immersion "k"
Part 8. Protectionbyliquidimmersion "k"
Published 2010-11-10
2011-09-01 implementation
Administration of Quality Supervision, Inspection and Quarantine of People's Republic of China
Standardization Administration of China issued
Foreword
All technical contents of this section is mandatory.
GB 25286 "non-explosive atmospheres Electrical Equipment" contains the following sections.
--- Part 1. Basic method and requirements;
--- Part 2. limiting shell type "fr";
--- Part 3. type flameproof enclosure "d";
--- section 4. intrinsically safe type "g" (under consideration);
--- Part 5. Structure safe "c";
--- Part 6. Control type ignition source "b";
--- part 7. Pressurized "p" (under consideration);
--- Part 8. liquid immersion "k".
This section is GB 25286 "non-electrical equipment for explosive atmospheres" Part 8, is modified using EN13463-8.2003 potentially explosive. "
Environmental non-electrical equipment - Part 8. liquid immersion "k" "(in English) developed.
This section and EN13463-8.2003 is the main difference. In order to express agreement with GB 3836.1, this section will EN13463-8.
2003 M1, M2 respectively correspond to stage device of this section Ma, Mb-level device; the EN13463-8.2003 Class Ⅱ 1G, 2G,
3G correspond to the level of this part of the device class Ⅱ Ga, Gb, Gc-level device; and EN13463-8.2003 in class Ⅱ 1D, 2D, 3D-level device
Section respectively correspond to the present type Ⅲ Da, Db, Dc stage equipment; flag also made the corresponding change. In addition, remove the EN13463-8.2003
Nothing to do with this part of the informative annex ZA.
This section was proposed by China Electrical Equipment Industrial Association.
This part of the jurisdiction of the National Standardization Technical Committee explosion-proof electrical equipment.
This part was drafted. Nanyang Explosion Electric Institute, the national explosion-proof electrical products for Quality Supervision and Inspection Center of CNOOC Tianjin
Engineering Research and Design Institute, Zhejiang Hangzhou Construction Machinery Co., Ltd.
This part of the main drafters. Zhang Gang, WANG Xian Hua, Yang Jinnan, Liu Heng Yun, Huang Xiaoping, Li Shu North Korea.
Introduction
Some types of non-electrical equipment used in explosive atmospheres protective gas, vapor and/or combustible dust, so that the immersion potential ignition source
In the protection liquid, or a flow of liquid with a protective film which covers continuously the potential ignition become invalid. In some devices, the use of security
Liquid care only to prevent potential ignition source becomes effective ignition source. In other devices, the protective liquid using other purposes, e.g.
Lubrication and/or cooling the moving parts, or transfer energy in the hydraulic system. In some devices, the liquid may be an actual protection process liquid
itself.
Using examples of this type of ignition protection are.
a) for example immersed in the oil on the vehicle wheels in a potentially explosive environment disc brake;
b) a separator and a pump for delivering other potentially flammable liquids, their activity mechanism immersed in the liquid to be treated is combustible lowest allowed
Xu below the liquid level (e.g. with submersible pump dispensers);
c) rotating the inner member of the hydraulic pump and motor hydrostatic continuously immersed in the transfer or flow of hydraulic fluid energy of liquid;
d) oil-filled gear box, the gear portion is not oil, and continuously covered by a continuous mucous membrane of the lubricating oil. In this example, the covering
The oil may splatter protective layer provided naturally by the wheel, because the wheel rotates in the oil tank or the gearbox oil pump fuel through
Feeding a continuous flow of oil to the wheel;
e) example. between the input shaft with the output shaft of the drive motor and the machine fully loaded, the hydraulic coupling for connecting the hydraulic
Torque converter, so as to allow gradual start (soft start).
In all the above examples, the principle of preventing the ignition of the liquid is continuous through the protective cover and/or lubrication, cooling movable member, preventing the circumferential
Wai explosive atmosphere in contact with the ignition source.
Similar oil immersed "o" electrical protection devices have been used for many years, in addition to the above uses, the electrically insulating liquid can also be used
medium. This part of electrical equipment can not be used, because it allows the conductive liquid.
Non-electrical equipment for explosive atmospheres
Part 8. liquid immersion "k"
1 Scope
1.1 part specifies the use of different levels of liquid immersion "k" for preventing a potential ignition source device design becomes effective ignition source protection,
Structural requirements, testing and marking.
1.2 liquid immersion "k" alone can be used as other types of ignition protection preventing, may be listed at the GB 25286.1
Ignition-type protection combination according ignition hazard assessment class Ⅰ Ma and Mb level and class-level Ⅱ Ga, Gb, Gc grade, class Ⅲ Da,
Provide protection Db, Dc grade equipment.
1.3 This section applies to the liquid immersion type protecting non-electrical equipment, this section is complementary to GB 25286.1 requirements.
1.4 does not apply to ignition-protected electrical equipment. For these requirements, reference should GB 3836.1-2010 and GB 3836.6-
2005, which requires the use of special protective electrically non-conductive liquid.
2 Normative references
Terms of the following documents constitute provisions of this section by reference in this part of GB 25286. For dated reference documents
Pieces, all subsequent amendments or revisions do not apply to this section, however, whether according to encourage the parties to reach an agreement in this section
Use the latest versions of these documents. For undated reference documents, the latest versions apply to this section.
GB 4208-2008 shell protection (IP code) (IEC 60529.2001, IDT)
GB 25286.1-2010 non-electrical equipment explosive atmospheres - Part 1. Basic method and requirements
3 Terms and Definitions
This in part is established and GB 25286.1 following terms and definitions.
3.1
Liquid immersion "k" liquidimmersion "k"
A protective type, the potential ignition source becomes inactive or isolated from the explosive environment. Potential ignition sources by fully or partially submerged
In a protective liquid, or a continuous source of ignition covered with a protective liquid active surface, so that the liquid may be above or outside the device housing
Not ignite explosive atmospheres.
3.2
Protection liquid protectiveliquid
Prevent explosive atmospheres and potential ignition source in direct contact, ensure that the liquid explosive atmosphere can not be ignited.
3.3
Equipmentwithasealedenclosure apparatus with a sealed enclosure
In operation when the liquid inside the protective expansion and contraction can be prevented from entering the explosive mixture outside the closed apparatus, comprising any
And the associated piping system overpressure releasing means may be contained.
3.4
With the exhaust port of the housing apparatus equipmentwithaventedenclosure
During normal operation when the liquid inside the protective expanded or contracted, by allowing an external explosive mixture into the respiratory device or shrinkage holes
Fully enclosed or discharge devices, including any associated piping system.
3.5
Opening device openequipment
Element or the protective device itself immersed in liquid communication with the external explosive mixture, for example. a top open submerged receiving active element
Device. Such devices include any associated piping system.
4 suitability determination
The method for protective equipment or protective apparatus components assembled in this section (including interconnected components) before 4.1, shall GB 25286.1-
2010 required 5.2 will be a source of ignition hazard assessment.
4.2 GB 25286.1 should meet the requirements prescribed in this section, except special provisions.
5 determining the maximum/minimum limit
Equipment manufacturer should determine the following 5.1 maximum/minimum value by calculation and/or type test.
--- the maximum, minimum level of protection liquid, or, if more appropriate, maximum, minimum pressure or flow;
--- maximum working angle formed with the horizontal apparatus;
--- except for the maximum, minimum viscosity, the liquid nature of the protecting liquid protection specified by the manufacturer.
Identified potential ignition sources ensure complete submersion or continuously covered by a protective sufficient liquid to ensure that no ignition source becomes active. Should note
Intended to fluctuations in the liquid undulating over the entire operating temperature range, sputtering, turbulence, stirring, stopping the most unfavorable loading conditions and equipment.
5.2 If the ignition protection coating to provide the necessary continuous source of ignition and the localized immersion potential by pump suction, the liquid flows directly or
Cover, the manufacturer should determine the nozzle, or jet position covering the most effective means to provide the maximum protection.
Calculation or results of a predetermined type test shall be listed as 5.3 and the manufacturer's technical documentation; GB 25286.1 request to the user operation
Specification shall be given for a maximum/minimum limit.
6 protection liquid
Protection viscosity and chemical composition of the liquid should be used.
--- by providing a continuous film or layer coverage of potential ignition sources, and to prevent the potentially explosive mixture ignition hazard assessment determined
Direct contact with potential ignition source;
--- itself does not become a source of ignition of any explosive gas. This movable member comprises a stirring work and/or protective liquids and provided
Preparation for producing voids caused by the chemical reaction between the material produced, bubbles or mist;
Note. do not exclude the use of flammable liquids as protecting liquid.
--- itself does not produce ignition sources (eg. heat easily precipitate itself).
7 construction equipment
7.1 Structure of the equipment should ensure the protection of the liquid reaches the necessary amount. If the level of protection required, may be mounted on a monitoring device mounted
Position, indicator or gauge displays the highest and lowest level to meet the requirements, or more, if applicable, in accordance with a predetermined display protection liquid Chapter 5
Pressure and flow body. If the indicator or scale installation of these devices, which should enable the user to easily read position.
Note. This device is not a safety device, not prevent ignition. If further use of such devices to prevent ignition should meet the requirements of GB 25286.6.
7.2 If the horizontal position of the device using a direction angle, so that the ignition protection decreased to an unacceptable level, according to the fifth
Zhang determined to maintain the specified maximum/minimum limit of the maximum allowable operating angle, or the necessary slope on the device should be visible or can be found.
7.3 If the protection of contaminated liquid, deterioration or aging causes a corresponding anti-ignition protection Ignition protection level drops below the level of equipment levels,
The manufacturer shall provide structural measures and/or provide maintenance instructions to ensure a continuous liquid to maintain the necessary anti-ignition protection throughout the operating life
Level.
Note. For example, this can be achieved in the following ways.
a) If the device has a continuous flow of liquid, providing a filter to prevent solid impurities measure was taken on the movable member;
b) If the opening device, select one of the liquid is not protected moisture and dust contamination adversely affect the environment, such as;
c) If the equipment is necessary to prevent serious environment impact dust and water vapor, the housing 4208 to provide a predetermined required at least IP66 of protective GB
grade;
The overpressure releasing means of at least class IP23 d) If a device with a sealed housing, the housing should have a predetermined GB 4208 by the liquid filling apparatus
Manufacturer member disposed at an absolute pressure of at least 1.1 times or more and the level higher than the normal operating pressure of at least 10kPa operating conditions;
e) if the housing has a through hole, the structure should enable the normal operation of the fluid may be circulated protective gas or vapor through at least IP23 degree of protection
Breathing apparatus (in accordance with the provisions of GB 4208) is discharged, if necessary, adding an appropriate desiccant;
f) If the manufacturer's instructions, the instructions required for the liquid to be monitored in conventional conditions, and check the predetermined maximum permissible pollutant circumferential
period. Liquid contaminants may be precipitated impurities and degradation products, e.g., acidity or chemical change caused by the water content of the liquid component abnormal changes.
7.4 Measures should be taken to prevent accidental loosening close protection liquid external and internal fastener cover. Any protection needs to indicate a liquid solution
Bit means, and the injection or discharge protection plugs and other components of the liquid, the same measures need to be taken, because if these components are not
To maintain anti-leak state, it will lead to a lower level of protection ignite an unacceptable level.
Examples prevent accidental loosening measures are as follows.
a) a threaded portion adhesive;
b) locking washer;
c) a solid wire tie bolt head.
7.5 monitoring device, indicator or scale to be designed and constructed to show the actual level.
7.6 pointing device configuration, and installation position of protection shall ensure that leakage does not occur and damage during normal operation.
7.7 can be measured using foot inspection work protection level of the liquid, the measurement scale should be fixed in its measuring position, or to keep the dense protective
Closure requirements. Shall be provided in the vicinity of an identification, it should be added to indicate the position of the liquid level.
7.8 If necessary, it should prevent the possibility of the loss of the protective liquid by capillary or siphon action may have caused.
7.9 devices for open or opening device, the maximum temperature of any surface of the protective liquid is exposed to the explosive mixture should not exceed
Based on the maximum surface temperature over the provisions of GB 25286.1 groups.
Type test claim 8 and housing
8.1 Overview
When tested according to 8.2 and 8.3, or deformation due to fluid loss apparatus, should not fall below the level of protection of the liquid 5
The minimum limits specified in the following chapter.
The following tests should be carried out when the device did not work.
8.2 Test overpressure protection comprising static or flowing liquid and having a sealed casing of the device
Protecting liquid is injected in the housing to the maximum level predetermined, the housing should withstand 1.5 times the maximum normal operating gauge pressure, at least
Overpressure 50kPa, which lasted 60s.
8.3 a housing having an opening overpressure test device
Protecting liquid is injected in the housing to the maximum level predetermined, the housing receiving 1.2 times the maximum normal operating gauge pressure, at least
20kPa overpressure, which lasted 60s.
9 and the description file
9.1 Overview
Device comply with this part shall include a user manual, including detailed GB 25286.1 predetermined should also comprising
The following.
a) the highest and lowest liquid level of protection of the detailed description, if more appropriate, the liquid can be predetermined maximum protection, minimum pressure, and
flow;
Detail b) of the maximum normal operating pressure;
c) Detailed description of the maximum allowable working angle with the horizontal plane of the device;
d) Describe the type of fluid used or a minimum viscosity;
e) If necessary, special equipment installation instructions;
f) the maintenance, the recommended working life, replace, complement and protect the liquid handling instructions;
g) where applicable, periodic internal cleaning, removal of the sediment will self-heat;
Commissioning h) equipment described initial injection and put to use in the protection liquid.
9.2 GB 25286.1 meet the technical documentation requirements
GB 25286.1 demonstrate compliance with the technical documentation shall include user manual, GB 25286.1 prescribed content and the following information.
a) target and intended use;
Protection type, temperature and related standards group b) requirements;
c) identifying with the interpretation model;
d) function;
e) different types;
f) Main drawings. FIG total, and FIG member attached file;
g) the calculation result;
h) a required test routine;
i) type test report showing compliance with the provisions of Chapter 8;
j) the maximum temperature --- if applicable, the temperature of the test report;
k) documents with IP protection rating.
10 logo
10.1 GB 25286.1 addition to meeting the requirements of the flag, the flag particular comply with this part should include a symbol "k" (liquid immersion type indicates
Anti-burning type).
10.2 flag for explosive atmosphere the exemplary Ⅱ Gb grade explosion-proof apparatus. Ex kⅡT4 Gb
10.3 Ⅰ exemplary class mark Mb stage explosion-proof apparatus. Ex kⅠ Mb
0102-
8.68252
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