The operating vacuum of around 710 mm hg is considered low now-a-days, due to the recent development in the manufacturing process. It has become essential to create more vacuum in the process system to save the energy, in the distillation process or to have a better yield.
Watering vacuum pumps has its own limitation to develop vacuum at a higher range. To achieve more vacuum in process, they recommend use of high vacuum system. It is also known as two stage vacuum pumping system.
These systems are capable to create 1 mm hg absolute pressure with bank suction. To enable us to design your specific high vacuum systems, they would like to know the capacity of pump (in M3/hrs or in CFM) at operating vacuum. The material of construction of the systems depends upon the medium being handled. To enable us to select proper material, they would like to know the medium to be handled by high vacuum systems.