GB/T 40344.2-2021Vacuum technology - Standard methods for measuring vacuum-pump performance - Part 2: Positive displacement vacuum pumps (English PDF)
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Issued by
State Administration for Market Regulation, China National Standardization Administration
Level / Type
National · Recommended
Issue date
August 20, 2021
Implementation date
March 1, 2022
Scope
GB/T 40344.2-2021 (Vacuum technology - Standard methods for measuring vacuum-pump performance - Part 2: Positive displacement vacuum pumps) is available as an English-translated PDF.
GB/T 40344.2-2021 is the Chinese standard "Vacuum technology - Standard methods for measuring vacuum-pump performance - Part 2: Positive displacement vacuum pumps".
Its scope clause reads: This part of GB/T 40344 specifies the volume flow rate, base pressure, water vapor tolerance, power consumption and minimum starting temperature of volumetric vacuum pumps.
The measuring method of degree, the volumetric vacuum pump directly exhausts the atmosphere and its base pressure is usually lower than 10kPa. In this section, it is necessary to use the method specified in GB/T 40344.1 to determine the volume flow rate and base pressure.
This section also applies to other pumps that directly exhaust the atmosphere, such as traction pumps. Its clauses include terms and definitions.
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Document preview — GB/T 40344.2-2021
National Standard of the People's Republic of China
- Classification
- J 78
Issued by: State Administration for Market Regulation, China National Standardization Administration
Contents
- Foreword
- Introduction
- 1 Scope
- 2 Normative references
- 3 Terms and definitions
- 4 Symbol
- 5 Test method
- 5.1 Measurement of volume flow rate
- 5.1.1 Measurement method
- 5.1.2 Flow method
- 5.1.3 Air extraction method
- 5.1.4 Operating conditions
- 5.2 Measurement of base pressure
- 5.3 Measurement of water vapor tolerance
- 5.4 Determination of power consumption
- 5.4.1 Overview
- 5.4.2 Measurement conditions
- 5.4.3 Measurement Step
- 5.5 Minimum starting temperature
- 5.6 Measurement uncertainty
- Appendix A (informative appendix) Measurement of water vapor tolerance
- Appendix B (Informative Appendix) Calculation of Water Vapor Tolerance
- Appendix C (informative appendix) Table of saturated vapor pressure of water
1 Scope
This part of GB/T 40344 specifies the volume flow rate, base pressure, water vapor tolerance, power consumption and minimum starting temperature of volumetric vacuum pumps.
The measuring method of degree, the volumetric vacuum pump directly exhausts the atmosphere and its base pressure is usually lower than 10kPa.
In this section, it is necessary to use the method specified in GB/T 40344.1 to determine the volume flow rate and base pressure.
This section also applies to other pumps that directly exhaust the atmosphere, such as traction pumps.
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 40344.1-2021 Vacuum technology vacuum pump performance measurement standard method Part 1.General requirements (ISO 21360-21.
2020, IDT)
3 Terms and definitions
The following terms and definitions defined in GB/T 40344.1 apply to this document.
The address of the terminology database maintained by ISO and IEC for standardization is as follows.
3.1 Gas town gasbalast
Introduce gas or air into the compression volume of the pump.
3.2 Water vapor tolerance
pH2O
The maximum value of water vapor pressure that can be delivered by the pump without condensation in the pump.
Note 1.If there is no water vapor condensation problem, for example, the pump is equipped with an oil-water separation device, then the highest water vapor pressure is recognized.
Note 2.The test report should include environmental conditions.
3.3 Water vapour capacity
The mass of water that can be delivered by the pump without condensation in a unit of time.
Note 1.The test report should include environmental conditions.
3.4 Working volume sweptvolume
VSW The volume of gas delivered by the pump in a cycle. […]
......
This preview omits tables, figures, formulas and parts of the technical clauses. The complete document — 30 pages — is available in the English PDF.
Referenced standards
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Related Standards
GB/T 40344.1-2021 — Vacuum technology - Standard methods for measuring vacuum-pump performance - Part 1: General description
GB/T 40344.3-2024 — Vacuum technology - Standard methods for measuring vacuum pump performance - Part 3: Specific parameters for mechanical booster vacuum pumps
GB/T 40344.4-2025 — Vacuum technology - Standard methods for measuring vacuum-pump performance - Part 4: Turbomolecular vacuum pumps
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