GB/T 19955.2-2005
Vapour vacuum pumps.Measurement of performance characteristics.Part 2:Measurement of critical backing pressure (English Version)
- Standard No.
- GB/T 19955.2-2005
- Language
- Chinese, Available in English version
- Release Date
- 2005
- Published By
- General Administration of Quality Supervision, Inspection and Quarantine of the People‘s Republic of China
- Latest
- GB/T 19955.2-2005
- Replace
- JB/T 8472.2-1996
- Scope
- This part of GB/T 19955 specifies the method for measuring the critical backing pressure of vapor flow vacuum pumps. The dependence of the performance of the vapor flow pump on the fore-stage pressure can be described in detail by the relationship between the inlet pressure and the fore-stage pressure of the working range. In general, it is appropriate to specify the critical foreline pressure with a single parameter as specified in 3.1. But for some cases, especially UHV performance or related gases like hydrogen and helium, full curves may be required. The pumps involved in this Part are composed of the following three types of oil and mercury vapor pumps: ——steam jet vacuum pumps; ——diffusion pumps; ——diffusion jet pumps.
GB/T 19955.2-2005 Referenced Document
- GB/T 19955.1-2005 Vapour vacuum pumps.Measurement of performance characteristics.Part 1:Measurement of volume rate of flow (pumping speed)
GB/T 19955.2-2005 history
- 2005 GB/T 19955.2-2005 Vapour vacuum pumps.Measurement of performance characteristics.Part 2:Measurement of critical backing pressure
GB/T 19955.2-2005 Vapour vacuum pumps.Measurement of performance characteristics.Part 2:Measurement of critical backing pressure has been changed from JB/T 8472.2-1996 Performance determination of vapor flow vacuum pump Part II: Determination of the front stage of critical pressure.
