1, The ultimate pressure of the vacuum pump should meet the process of working pressure.Choose the ultimate pressure of the pump is lower than the technical requirements about an order of magnitude.
2, Scope of each vacuum pump has a certain work pressure, therefore, the working point of the vacuum pump should be selected in the range of this working point , but can’t let it work too long time at the environment over work allows pressure.
3, Vacuum pump under the pressure, should be able to exhaustall the gas during the process of vacuum process equipment.
4, When choosing vacuum pump unit:
(1) When using a vacuum pump can not meet the requirement of the extraction and vacuum, need several vacuum pump combination, complement each other to meet the technological requirements.
(2) Some vacuum pump cannot work under atmospheric pressure, need forevacuum;Before some vacuum pump outlet pressure below atmospheric pressure, need the backing vacuum pump, vacuum pump need combined use.By the combination of vacuum pump, we call it a vacuum pump unit or vacuum pump system , It will have good for the vacuum system to get vacuum and Vacuum-pump efficiency,We should properly select combination of vacuum pump, due to the different vacuum pump for pumping gas have different requirements, such as: in the general case roots – rotary vane vacuum system does not use the system suction contains more non-condensable gas system.
5, When you choose oil seal pump, you should first understand whether your vacuum system have requirements of oil pollution. When equipment strict with oil free, should choose all kinds of oil pump, such as water ring vacuum pump, cryogenic pump, etc. If not strict, oil pump, add some oil pollution prevention measures, such as add cold traps, Wells, baffle, etc., can also meet the requirements of clean vacuum.
6, Understanding is pumped gas composition, gas contains excluding condensable vapor, presence of dust particles, and corrosion resistance, etc. Need to know when choosing a vacuum pump gas composition, gas is pumped to choose appropriate pump. If gas is contained in tidy, particles and corrosive gas, should be considered in the pump inlet piping installation of auxiliary equipment, such as condenser, filter, etc.
7, When choosing oil seal vacuum pump, to consider the vacuum pump oil steam discharged (soot) impact on the environment. If pollution is not permitted in the environment, should choose oil-free vacuum pump, or the oil steam exhaust to the outside.
8, Vacuum pump vibration of working with and without influence to the technological process and the environment, if the process does not allow, should choose or choose no vibration of the pump vibration prevention measures. The price of
9, Vacuum pump, operation and maintenance costs.
In after considering all kinds of situation, we can finally determine a suitable for your solution: (1) the smallest investment costs. (2) the minimum operation cost. (3) before considering two cases.