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GB/T 39795-2021: Conveyor belts for general purpose use - Electrical and flammability safety requirements
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Conveyor belts for general purpose use - Electrical and flammability safety requirements
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GB/T 39795-2021
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Basic data | Standard ID | GB/T 39795-2021 (GB/T39795-2021) | | Description (Translated English) | Conveyor belts for general purpose use - Electrical and flammability safety requirements | | Sector / Industry | National Standard (Recommended) | | Classification of Chinese Standard | G42 | | Word Count Estimation | 10,192 | | Issuing agency(ies) | State Administration for Market Regulation, China National Standardization Administration | GB/T 39795-2021: Conveyor belts for general purpose use - Electrical and flammability safety requirements
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Conveyor belts for general purpose use - Electrical and flammability safety requirements
ICS 53.040.20
G42
National Standards of People's Republic of China
General purpose conveyor belt
Electrical conductivity and flammability safety requirements
Released on 2021-03-09
2021-10-01 implementation
State Administration of Market Supervision and Administration
Issued by the National Standardization Management Committee
Foreword
This standard was drafted in accordance with the rules given in GB/T 1.1-2009.
This standard was proposed by the China Petroleum and Chemical Industry Federation.
This standard is under the jurisdiction of the National Belt Wheel and Belt Standardization Technical Committee Conveyor Belt Subcommittee (SAC/TC428/SC1).
Drafting organizations of this standard. Zhejiang Shuangjian Rubber Co., Ltd., Zhejiang Fenfei Rubber and Plastic Products Co., Ltd., Zhejiang Sanwei Rubber Products Co., Ltd.
Co., Ltd., Zhongnan Rubber Group Co., Ltd., Qingdao Sinochem New Materials Laboratory, Qingdao University of Science and Technology.
The main drafters of this standard. Shen Huimin, Zheng Shisheng, Wen Shoudong, Wang Chuangui, Li Jian, Xin Yonglu, Ye Yangzheng, Feng Hongming.
General purpose conveyor belt
Electrical conductivity and flammability safety requirements
1 Scope
This standard specifies the conductivity and flammability safety requirements and safety level categories of general purpose conveyor belts used by non-downhole equipment.
This standard applies to conveyor belts that are not used by downhole equipment.
2 Normative references
The following documents are indispensable for the application of this document. For dated reference documents, only the dated version applies to this article
Pieces. For undated reference documents, the latest version (including all amendments) is applicable to this document.
GB/T 3684 Specification and Test Method for Conductivity of Conveyor Belt
GB/T 3685 Laboratory-scale test method for combustion characteristics of conveyor belts
GB/T 7986-2013 Conveyor belt roller friction test
GB/T 15706 General Principles of Mechanical Safety Design Risk Assessment and Risk Reduction
GB/T 16412 Conveyor belt propane single burner flammability test method
GB/T 33204 Lightweight conveyor belt resistance measurement
GB/T 34366 Light Conveyor Belt Measurement of Static Electric Field Generated by Light Conveyor Belt Operation
GB/T 39817 Conveyor belt propane burner medium-scale flammability test method
Basic performance and application of GB/T 39825 light conveyor belt
3 Terms and definitions
The following terms and definitions apply to this document.
3.1
Durationofafterflame
After the fire source is evacuated, there will be flame burning duration.
3.2
Flameless glowing
Burning that glows with heat (no flame).
3.3
Undamaged
The remaining part of the conveyor belt after the propane roadway combustion test did not show obvious embrittlement, cracks, bubbling or other things that were not there before.
defect.
4 Security requirements
4.1 General
Various conveyor belts (1, 2A, 2B, 3A, 3B, 4A, 4B, 5A, 5B, and 5C) should meet the requirements of Table 1 and 4.2~4.5.
4.2 Electrical conductivity
4.2.1 According to the test of GB/T 3684, the surface resistance of the general purpose conveyor belt is not more than 300MΩ.
4.2.2 Test according to GB/T 33204, except for the conditions specified in 4.2.3, the surface resistance of the light conveyor belt described in GB/T 39825
Not more than 300MΩ.
4.2.3 According to GB/T 34366 test, the surface voltage of the light conveyor belt with internal conductive layer is not more than 1000V.
Note. This standard only considers the static charge generated when the light conveyor belt is running at no load.
For special working conditions (such as conveying electronic components), the conductivity of the conveyor belt can be required according to the volume resistance. For the measurement method of volume resistance, see
GB/T 33204.This standard does not make safety requirements for volume resistance of light conveyor belts.
4.3 Flame resistance
4.3.1 When testing a conveyor belt of type 2A or 3A with a complete covering layer (see Chapter 5 and Table 1) according to GB/T 3685, the conveyor belt
The sum of the flame duration of the 6 tests should be less than 45s, and the flame duration of any one time should not be greater than 15s.
4.3.2 According to GB/T 3685, the categories 2B, 3B, 4A, 4B, 5A, 5B and 5C with a complete cover layer and a peeled cover layer (see Chapter 5 and
Table 1) When the conveyor belt is tested, the flame of each group of 6 tests (that is, 6 tests with a complete cover layer and 6 tests with a peeling cover layer)
The sum of the durations should be less than 45s, and the flame duration of any one test should not be greater than 15s.
4.4 Fire simulation
4.4.1 When testing 4A, 4B, 5A, 5B and 5C conveyor belts in accordance with GB/T 16412, the length of the conveyor belt that is not damaged at the end of the test
The degree should meet the requirements of Table 1.
4.4.2 The GB/T 16412 test method is not applicable to the light conveyor belt described in GB/T 39825.Light conveyor belt is only suitable for type 1, 2A
And 2B category.
4.5 Roller friction
4.5.1 According to GB/T 7986-2013 method B1 (constant load is 343N) for 3A, 3B and 4B categories (see Chapter 5 and Table 1)
During the belt test, the belt should not appear from the beginning of the test to the test time reaching 60 minutes or until the conveyor belt is worn out within 60 minutes
flame.
4.5.2 According to method B2 in GB/T 7986-2013 (the maximum load is 1715N), the conveyor belt of category 5A (see Chapter 5 and Table 1) is carried out.
Test, from the start of the test to the test time reaches 150min or until the conveyor belt is worn within 150min, the belt should not appear
flame.
4.5.3 According to method B2 in GB/T 7986-2013 (the maximum load is 1715N), the conveyor belt of category 5B (see Chapter 5 and Table 1) is carried out.
Test, from the start of the test to the time the test time reaches 150min or until the conveyor belt is worn out within 150min, the belt should not show flame
Or flameless combustion.
4.5.4 According to method B2 in GB/T 7986-2013 (the maximum load is 1715N), carry out the conveyor belt of category 5C (see Chapter 5 and Table 1)
Test, from the start of the test to the time the test time reaches 150min or until the conveyor belt is worn out within 150min, the belt should not show flame
Or flameless combustion, and the drum temperature during the test should not exceed 400 ℃.
4.5.5 The test method specified in GB/T 7986-2013 is not applicable to the light conveyor belt described in GB/T 39825.Light conveyor belt only
Applicable to category 1, 2A and 2B.
5 Security classification
5.1 Class 1
Conveyor belts only meet the requirements of 4.2 and are Class 1.
5.2 Category 2A
The conveyor belt meets the requirements of 4.2 and 4.3.1 and is of category 2A.
5.3 Category 2B
Conveyor belts meet the requirements of 4.2 and 4.3.2, and are of category 2B.
5.4 Category 3A
The conveyor belt meets the requirements of 4.2, 4.3.1 and 4.5.1, and is of category 3A.
If the type 3A conveyor belt cannot be tested in 4.5.1 due to the belt structure, the conveyor belt is type 2A.
In this case, corresponding safety measures should be taken in accordance with GB/T 15706.
5.5 Category 3B
Conveyor belt meets the requirements of 4.2, 4.3.2 and 4.5.1, and is category 3B.
If the type 3B conveyor belt cannot be tested in 4.5.1 due to the belt structure, the conveyor belt is type 2B.
In this case, corresponding safety measures should be taken in accordance with GB/T 15706.
5.6 Category 4A
The conveyor belt meets the requirements of 4.2, 4.3.2 and 4.4, and is 4A category.
5.7 Category 4B
The conveyor belt meets the requirements of 4.2, 4.3.2, 4.4 and 4.5.1, and is 4B category.
If the 4B type conveyor belt cannot be tested in 4.5.1 due to the belt structure, the conveyor belt is 4A type.
In this case, corresponding safety measures should be taken in accordance with GB/T 15706.
5.8 Category 5A
The conveyor belt meets the requirements of 4.2, 4.3.2, 4.4 and 4.5.2, and is of category 5A.
If the type 5A conveyor belt cannot be tested in 4.5.2 due to the belt structure, the conveyor belt is of type 4A.
In this case, corresponding safety measures should be taken in accordance with GB/T 15706.
5.9 Category 5B
The conveyor belt meets the requirements of 4.2, 4.3.2, 4.4 and 4.5.3, and is of category 5B.
If category 5B cannot be tested in 4.5.3 due to belt structure, the conveyor belt is category 4A.
In this case, corresponding safety measures should be taken in accordance with GB/T 15706.
5.10 Category 5C
The conveyor belt meets the requirements of 4.2, 4.3.2, 4.4 and 4.5.4, and is of category 5C.
If the 5C type conveyor belt cannot be tested in 4.5.4 due to the belt structure, the conveyor belt is 4A type.
In this case, corresponding safety measures should be taken in accordance with GB/T 15706.
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