How to determine the pumping capacity of a vacuum pump
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I recently encountered a practical issue with a vacuum pump and would like to ask for advice. My evaporation rate is up to 75 m3/h; what size of vacuum pump should I choose for pumping? How much margin is appropriate to leave?
The chapter on pumps in the chemical engineering design manual contains calculations for the selection of vacuum pumps. It needs to be considered from the perspective of the vacuum system
The key is to know what level of vacuum you need. The performance curves of vacuum pumps from different manufacturers are not exactly the same; generally, for the same pump, the higher the vacuum level, the lower the pumping speed will be. You can also get in touch with a regular manufacturer—he’ll do the calculation for you.
Is there a petrochemical design manual?
The vacuum level required is 0.8 barg, which isn’t very high. We want to carry out the calculations ourselves before submitting them to the vacuum pump manufacturer; we’re not sure how to do these calculations
The selection of a vacuum pump requires comprehensive consideration of several factors; first and foremost, it is necessary to determine what type of vacuum pump should be used. At present, vacuum pumps are classified into water ring vacuum pumps, dry vacuum pumps, oil pumps, and steam jet pumps. First, determine the type of vacuum pump, and then consider parameters such as the gas medium to be evacuated, temperature, pressure, required level of vacuum, amount of gas generated, and so on. This is a complex matter that requires calculation by specialized manufacturers.
Thank you for the reminder. This time we have chosen a water ring vacuum pump, with SIHI specified as the brand
I suggest that the best manufacturer of water ring vacuum pumps is Gitednas Vacuum Pumps; it is the best producer of such pumps in the world, with its production facilities located in Zibo
The product curves of different manufacturers vary, so first request product manuals from 3 to 4 manufacturers. Separate quoting and selection. Choose one based on the working conditions as well. Comparison can improve oneself.
The calculations for vacuum pumps are available in the manuals. It is recommended to first cool the vapor after evaporation to a liquid state, and then connect a vacuum pump; in this way, the vacuum pump will only need to remove the leaked air, the saturated steam of the material, and the non-condensable gases.