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GB/T 40079-2021Classification system and qualification procedures for fugitive emission type testing of valves (English PDF)

阀门逸散性试验分类和鉴定程序

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Issued by

State Administration for Market Regulation, China National Standardization Administration

Level / Type

National · Recommended

Issue date

April 30, 2021

Implementation date

November 1, 2021

Scope

GB/T 40079-2021 is the English-translated version of 阀门逸散性试验分类和鉴定程序.

GB/T 40079-2021 is the Chinese standard "Classification system and qualification procedures for fugitive emission type testing of valves". Its scope clause reads: This standard specifies the type test requirements for valves for fugitive media, as well as the classification and identification procedures for fugitive tests.

This standard applies to shut-off valves and control valves whose media will produce volatile pollutant gases or hazardous fluid media. The test procedure for the evaluation of the leakage of the seal and the valve body sealing part.

This standard does not apply to leakage at the end of the valve, as well as vacuum, corrosion and radiation conditions. Its clauses include terms and definitions.

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Document preview — GB/T 40079-2021

National Standard of the People's Republic of China

Classification: J 16

Issued by: State Administration for Market Regulation, China National Standardization Administration

Foreword
1 Scope
2 Normative references
3 Terms and definitions
4 Abbreviations
5 Type test
5.1 Test condition
5.2 Test procedure
6 Performance level
6.1 Classification criteria
6.2 Sealing class
6.3 Durability level
6.4 Temperature class
6.5 Marking of grade name
6.6 Marking example
7 Report
8 Type test coverage principles
Appendix A (Normative Appendix) Total Leakage Rate Testing Method
Appendix B (Normative Appendix) Sniffer Law
Appendix C (informative appendix) Helium leak rate conversion

1 Scope

This standard specifies the type test requirements for valves for fugitive media, as well as the classification and identification procedures for fugitive tests.

This standard applies to shut-off valves and control valves whose media will produce volatile pollutant gases or hazardous fluid media.

The test procedure for the evaluation of the leakage of the seal and the valve body sealing part.

This standard does not apply to leakage at the end of the valve, as well as vacuum, corrosion and radiation conditions.

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 13927 Industrial valve pressure test

GB/T 21465 Valve Terminology

3 Terms and definitions

The following terms and definitions defined in GB/T 21465 apply to this document.

3.1 Bodyseals

The seal of any pressure-bearing part on the valve except the stem seal.

3.2 Concentration

The ratio of the volume of the test medium to the volume of the gas mixture measured on the leak source of the test valve.

Note. The unit of concentration is a dimensionless unit (parts per million volume content or volume fraction is 1×10-6), expressed in ppmv.

1ppmv=1mL/m3=1cm3/m3.

3.3 Control valve

A power operating device that can change fluid flow in a process control system.

Note. The device consists of a valve and its connected actuator. Among them, the actuator can change the position of the valve opening and closing parts according to the control system signal.

3.4 Fugitive emission

Unexpected or imperceptible leakage of any chemical or chemical mixture in any physical form from equipment in an industrial site.

3.5 Leakage

Under the specified test conditions, the process of escaping the test medium through the valve stem or valve body seal of the tested valve.

Note. Generally expressed by concentration or leakage rate.

GB/T 45161 | GB/T 38599 | GB/T 30832 | GB 35208 | GB 33146 | […]

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This preview omits tables, figures, formulas and parts of the technical clauses. The complete document — 61 pages — is available in the English PDF.

Referenced standards

Normative references

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