Precautions for selecting a vacuum pump
1. The maximum pressure of the vacuum pump should meet the working pressure of the process. The maximum pressure of the pump is usually selected to be about an order of magnitude lower than the process requirements.
2. Each type of pump has a certain working pressure range, therefore, the working point of the pump should be selected within this range, and it should not be allowed to work for extended periods of time beyond the allowable working pressure.
3. The vacuum pump should be able to discharge all the gas generated during the process of the vacuum pump equipment under its working pressure.
4. Select vacuum unit:
(1) When a single pump cannot meet the requirements of pumping and vacuum, several pumps need to be combined and complement each other to meet the process requirements.
(2) A vacuum pump cannot operate at atmospheric pressure and requires pre vacuuming; Some vacuum pumps have outlet pressures lower than atmospheric pressure and require a front-end pump, so the pumps need to be combined for use. The vacuum pump unit, which is used in combination, can achieve better vacuum degree and exhaust volume in the vacuum system. We should choose the correct combination of vacuum pumps, as different vacuum pumps have different requirements for the extracted gas. For example, in general, Roots rotary vane units are not suitable for systems containing a large amount of condensable gases.
5. When choosing an oil sealed pump, you should first understand whether your vacuum system has requirements for oil contamination. If the equipment strictly requires no oil, various oil-free pumps should be selected, such as water ring pumps, low-temperature pumps, etc. If the requirements are not strict, you can choose to have an oil pump and add some anti oil pollution measures, such as adding cold traps, oil blocking traps, baffles, etc., which can also meet the requirements of clean vacuum.
6. Understand the composition of the extracted gas, whether it contains condensable vapor, whether there are particles, dust, corrosiveness, etc. When choosing a vacuum pump, it is necessary to know the gas composition and select the corresponding pump for the extracted gas. If the gas contains steam, particles, and corrosive gases, it should be considered to install auxiliary equipment such as condensers, dust collectors, etc. on the inlet pipeline of the pump.
7. When choosing an oil sealed vacuum pump, it is important to consider the impact of the oil vapor (oil fume) emitted by the vacuum pump on the environment. If pollution is not allowed in the environment, an oil-free vacuum pump should be selected or oil vapor should be discharged outdoors.
8. Does the vibration generated during the operation of the vacuum pump have any impact on the process and environment? If the process does not allow it, a pump without vibration should be selected or anti vibration measures should be taken.
9. Vacuum prices, operating and maintenance costs.
We can only finalize a solution that is suitable for you after considering this situation;
(1) Smaller investment costs
(2) Smaller production and operation costs
(3) A feasible solution to allocate the first two situations reasonably and evenly.
