NEWS & BLOGS

NEWS & BLOGS

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2021-01-18

How to choose a pump?

The function of a vacuum pump is to remove gas molecules from the vacuum chamber, thereby reducing the gas pressure inside the chamber and achieving the desired degree of vacuum. Generally speaking, there is a wide range—from atmospheric pressure all the way down to extremely high vacuum—and so far, no single vacuum system can cover this entire range. Therefore, to meet the process requirements, efficiency, and service life of different products, it’s necessary to select different vacuum system configurations for various vacuum stages. To achieve the optimal configuration, when choosing a vacuum system, you should take into account the following points: 1. The ultimate pressure of the vacuum pump should match the working pressure required by the process. Typically, the pump’s ultimate pressure should be about one order of magnitude lower than the process requirement. 2. Each type of pump has a specific operating pressure range; therefore, the pump’s operating point should be within this range and never allowed to run continuously beyond the permitted working pressure. 3. At its operating pressure, the vacuum pump must be able to evacuate the total amount of gas generated during the vacuum equipment’s process. 4. Selecting a vacuum unit: (1) When a single pump cannot meet the pumping and vacuum requirements, several pumps need to be combined and used in tandem to complement each other and satisfy the process demands. (2) Some vacuum pumps cannot operate at atmospheric pressure and thus require a preliminary vacuum stage; others have an outlet pressure lower than atmospheric pressure and therefore need a forepump. Hence, these pumps must be combined for use. A combination of pumps like this is called a vacuum pump unit, which can help achieve better vacuum levels and higher pumping speeds for the vacuum system. We should carefully select the appropriate combination of pumps, as different pumps have varying requirements for the gases they can handle—for example, under normal circumstances, a Roots-rotary vane pump combination is not suitable for systems containing large amounts of condensable gases. 5. If you choose an oil-sealed pump, you should first determine whether your vacuum system has any requirements regarding oil contamination. If the equipment strictly requires oil-free operation, you should opt for oil-free pumps such as liquid-ring pumps or cryogenic pumps. If the requirements are less stringent, you can choose oil-lubricated pumps and supplement them with measures to prevent oil contamination—such as installing cold traps, oil traps, baffles, and other devices—to still achieve clean vacuum conditions. 6. Understand the composition of the gas being pumped: Does the gas contain condensable vapors? Are there any particulate dusts? Is the gas corrosive? When selecting a vacuum pump, it’s crucial to know the gas composition and choose a pump that matches the specific gas being pumped. If the gas contains vapors, particles, or corrosive substances, you should consider installing auxiliary equipment—such as condensers or dust collectors—at the pump’s inlet pipeline. 7. When selecting an oil-sealed vacuum pump, you should also consider the environmental impact of the oil vapor (oil smoke) emitted by the pump. If the environment cannot tolerate any pollution, you should choose an oil-free vacuum pump or ensure that the oil vapor is vented outdoors. 8. Consider whether the vibrations generated by the vacuum pump during operation will affect the process or the surrounding environment. If the process cannot tolerate vibration, you should select a pump that produces no vibration or take measures to reduce vibration. 9. The cost of the vacuum pump, as well as its operating and maintenance expenses. Only after taking all these factors into account can you finally determine a solution that best suits your needs: (1) The lowest investment cost. (2) The lowest production and operating costs. (3) A feasible solution that reasonably and evenly balances the first two considerations. For more information, please call our consultation hotline: 0535-2980329

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