Vacuum pump
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When is a liquid ring vacuum pump used, and when is a dry vacuum pump used? Thank you.
If the gas being extracted is a product, a dry vacuum pump should be used to prevent any impact on the components of that product; this is especially true for the vacuum pumps used in the CO production process via PSA technology； Extracting gas is simply to maintain a vacuum state in the system; a liquid ring vacuum pump can be considered for this purpose, such as those used in distillation systems. Of course, dry pumps can also be used in such applications
The definite answer is: without considering environmental factors or extreme vacuum conditions, if the gas to be pumped is saturated air at a temperature above 20°C, then a liquid ring pump is the best choice. If the gas is unsaturated, the lower its humidity, the higher the efficiency of a dry vacuum pump! However, it is clear that various circumstances need to be taken into account; it cannot be generalized……
Your question is too general; there are few absolute distinctions. It depends on the specific operating conditions to determine which type is suitable, as well as the owner’s financial situation. Under appropriate conditions, if the owner prefers an environmentally friendly, energy-efficient, and high-performance solution, then a dry pump is obviously the best choice. Therefore, it’s not possible to make absolute distinctions based on usage conditions.