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6, has been pumping gas composition to understand.

With free gas can be steam condensate, with or without particles of dust, such as whether or not corrosion. Choice of vacuum pumps, the need to know the gas composition, was pumping gas for the pump selection. If the gas contains steam, particles and corrosive gases should be considered in the pump inlet tube on the road to install auxiliary equipment, such as condenser, collector and so on.

7, vacuum pump oil vapor emission from the impact on the environment.

If the environment does not allow any pollution, oil-free vacuum pump can be selected, or the oil vapor into the outside.

8, vacuum pump when the vibration of the availability of process and environmental impact.

If the process does not allow, should be selected without the vibration of the pump or take anti-vibration measures.

9, vacuum pump prices, operating and maintenance costs. License in circumstances, should be cheap and pump selection.