What is BS ISO 27892 - Vacuum technology about?
BS ISO 27892 discusses vacuum technology. Vacuum technology is a method used to evacuate air from a closed volume by creating a pressure differential from the closed volume to some vent, the ultimate vent being the open atmosphere. BS ISO 27892 specifies a method for the measurement of rapid shutdown torque (destructive torque) of turbomolecular pumps in which gas momentum is produced by axial flow type blades and/or helical channels. The main forces leading to the failure of turbomolecular pumps are torques around the rotational axis.
There are two kinds of failure: rapid shutdown by whole burst and softer crash of rotor. BS ISO 27892 applies to both. The same measurement method can be used for turbomolecular pumps and molecular drag pumps.
Note: Other insignificant forces and moments that can occur lie outside the scope of BS ISO 27892.
Who is BS ISO 27892 - Vacuum technology for?
BS ISO 27892 on vacuum technology is useful for:
- Pump manufacturers
- Cylinder manufacturers
- Design engineers
- Quality control personnel
- Research and development facilities
Why should you use BS ISO 27892 - Vacuum technology?
Vacuum technology deals with technological processes and equipment that use a vacuum to achieve better results than those that run under atmospheric pressure. BS ISO 27892 introduces a rotating turbomolecular pump or molecular drag pump that has a large amount of energy stored in the rotor due to the high rotational frequency. If the rotor breaks, this energy is released in a very short time and there is the possibility of rupture of the casing of the turbomolecular pump. Large reaction torque is also generated on the pump housing and there is a possibility that the bolts that fix the turbomolecular pump might break.
BS ISO 27892 is based on results compiled in studies of these possibilities and has been drafted as a measurement method by turbomolecular pump manufacturers with the aim of improving the safety of users. The core contents of BS ISO 27892 are the test methods for rapid shutdown torque measurement of turbomolecular pumps and molecular drag pumps. The term “turbomolecular pump” used in BS ISO 27892 is generic and includes molecular drag pumps and pumps which contain both technologies on the same shaft. Using BS ISO 27892 you can specify a method for the measurement of rapid shutdown torque (destructive torque) of turbomolecular pumps in which gas momentum is produced by axial flow type blades and/or helical channels.