The ultimate pressure of the vacuum pump must meet the working pressure of the production process. Basically, the ultimate pressure of the selected pump is not about an order of magnitude higher than the production process requirements. Each type of pump has a specific working pressure limit, so that the working point of the pump must be built within this range, and it cannot be kept running for a long time outside the allowable working pressure. Under its working pressure, the vacuum pump should properly discharge all the amount of gas brought by the production process of the vacuum equipment.
When one type of pump cannot meet the pumping and vacuum requirements, it is necessary to combine multiple pumps to complement each other to meet the production process requirements. Some vacuum pumps cannot operate under atmospheric pressure and require pre-vacuum; some vacuum pumps have an outlet pressure not higher than atmospheric pressure and require a fore pump, so they all need to be combined and selected. The vacuum pump selected in combination is called a vacuum pump unit, which can enable the vacuum system to obtain a good vacuum degree and exhaust volume. People should choose a combined vacuum pump properly, because different vacuum pumps have different requirements for the gas to be pumped out.
When you choose an oil-sealed pump, you must be familiar with whether your vacuum system has requirements for oil contamination as soon as possible. If the equipment is required to be oil-free, various types of oil-free pumps must be selected, such as: water ring pumps, cryogenic pumps, etc. If the requirements are not possible, you can choose an oil pump, plus some anti-oil pollution measures, such as adding cold traps, oil traps, baffles, etc., can also achieve clean vacuum requirements.
Familiar with the chemical composition of the pumped gas, whether the gas contains condensable steam, whether there is particle floating ash, whether there is corrosion stimulation, etc. When choosing a vacuum pump, it is necessary to know the chemical composition of the gas, and the corresponding pump should be selected for the pumped gas. If the gas contains steam, particulate matter, and corrosive irritant gas, it must be considered to install auxiliary equipment on the inlet pipeline of the pump, such as condenser, dust collector, etc.
When choosing an oil-sealed vacuum pump, it is necessary to consider the impact of the oil vapor (soot) emitted by the vacuum pump on the environment. If the environment does not allow pollution, an oil-free vacuum pump must be selected, or the oil vapor must be discharged outdoors.
Whether the vibration caused by the operation of the vacuum pump has any impact on the production process and the environment. If the production process is not allowed, a vibration-free pump should be selected or anti-vibration measures should be taken.
Post time: May-25-2022