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GB/T 36588-2018Safety devices for protection against excessive pressure -- Common data (English PDF)

过压保护安全装置通用数据

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Issued by

State Administration for Market Regulation, China National Standardization Administration

Level / Type

National · Recommended

Issue date

September 17, 2018

Implementation date

April 1, 2019

Scope

GB/T 36588-2018 is the English-translated version of 过压保护安全装置通用数据.

GB/T 36588-2018 is the Chinese standard "Safety devices for protection against excessive pressure -- Common data". Its scope clause reads: This standard specifies general data on the performance parameters of safety valve protection devices.

This standard applies to non-flash liquid and non-gas/liquid two-phase media. Its clauses include terms and definitions.

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Document preview — GB/T 36588-2018

National Standard of the People's Republic of China

ICS: 13.240
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 symbols and units
5 Safety valve performance determination
5.1 Determination of displacement coefficient
5.2 Critical and subcritical flow
5.3 Theoretical specific displacement under critical flow
5.4 Theoretical specific displacement under subcritical flow
5.5 Displacement 4 when the Reynolds number Re of the turbulent zone is not less than 80,
6 Calculation of rated displacement and determination of runner area
6.1 General
6.2 Valves for exhaust gas or steam
6.3 Calculation of displacement
6.3.1 Explanation of displacement calculation
6.3.2 Calculation of steam displacement under critical flow
6.3.3 Calculation of the displacement of wet steam
6.3.4 Calculation of gas displacement
7 Thermodynamic performance
7.1 Steam pressure coefficient ks
7.2 Function of adiabatic index k C
7.3 Theoretical displacement correction factor Kb 6 under subcritical flow
7.4 compression factor
7.5 viscosity correction factor Kv
Appendix A (informative) Example of displacement calculation in different media

1 Scope

This standard specifies general data on the performance parameters of safety valve protection devices.

This standard applies to non-flash liquid and non-gas/liquid two-phase media.

2 Normative references

The following documents are indispensable for the application of this document. For dated references, only dated versions apply to this article.

Pieces. For undated references, the latest edition (including all amendments) applies to this document.

General requirements for GB/T 12241 safety valves (GB/T 12241-2005, ISO 4126-1.1991, MOD)

GB/T 28778 pilot operated safety valve (GB/T 28778-2012, ISO 4126-4.2004, MOD)

3 Terms and definitions

The following terms and definitions as defined in GB/T 12241 and GB/T 28778 apply to this document.

3.1 Safety valve

An automatic valve that utilizes the force of the medium itself to discharge a nominal amount of fluid without any external force to prevent pressure from exceeding

Rated safety value. When the pressure returns to normal, the valve closes and prevents the media from continuing to flow out.

3.2 Setting pressure setpressure

The predetermined pressure at which the safety valve begins to open under operating conditions.

Note. This pressure is the gauge pressure measured at the inlet of the valve. Under this pressure, the force generated by the pressure of the medium under the specified operating conditions causes the valve to open.

The forces that remain with the flap on the valve seat balance each other.

3.3 Overpressure

The pressure increase that exceeds the set pressure of the safety valve is usually expressed as a percentage of the set pressure.

3.4 Discharge pressure

The sum of the set pressure and the excess pressure.

3.5 Discharge back pressure

The medium flows through the pressure formed by the safety valve and the discharge system at the valve outlet.

3.6 Additional back pressure

The static pressure present at the outlet of the safety valve immediately before its action is caused by other pressure sources in the discharge system.

3.7 Runner area flowarea

The minimum cross-sectional area of the flow path from the inlet end of the valve to the sealing surface of the seat (not the smallest area between the seat and the disc) is used to calculate

GB/T 38599 | GB/T 30832 | GB/T 29026 | GB 35208 | GB 33146 | […]

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This preview omits tables, figures, formulas and parts of the technical clauses. The complete document — 44 pages — is available in the English PDF.

Referenced standards

Normative references

ISO 4126

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