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Types of Conventional Vaccum Pump

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OTL (Once Through Lubricated) High Vacuum Pumps and System

Water Ring Vacuum Pumps

Single and double stage pumps that can achieve a maximum ultimate vacuum of 70 torr and 40 torr resp. The non-condensable will mix with the sealing fluid (water) and contaminate it. This will lead to the corrosion of the pump itself and all other utilities as this water has to be cooled to room temperature via the cooling tower. Size to size these type of pumps use more energy than oil sealed vacuum pumps of the same capacity. These pumps create Effluent.

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OTL (Once Through Lubricated) High Vacuum Pumps and System

Oil Sealed High Vacuum Pump

In this type, the pump is immersed in the sealing fluid (oil) and this is re circulated. The vapors sucked by the pump are exhausted thru the oil resulting in the vapors condensing in the oil and contaminants. Again if the vapors are corrosive then the pump itself will be subject to corrosion and heavy maintenance. To regain the required ultimate vacuum one needs to service the pump and fill in fresh oil which is time consuming and expensive.

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OTL (Once Through Lubricated) High Vacuum Pumps and System

Steam Jet Ejectors

These use large amounts of energy to produce high pressure motive steam for their motive force. The operating cost of Steam ejectors are increasing day by day due to frequent rise in fuel costs of the steam generator. These also require large quantities of water with growing scarcity of water and ever rising prices of L.D.O. for boilers, the steam jet ejector will not be economical for the process industry. The optimum performance of ejectors is achieved only in narrow range of steam pressure. These also create effluent.

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DRY SCREW VACUUM PUMPS

DRY SCREW VACUUM PUMPS

Exorbitantly priced, these pumps are imported. They are ideally used in clean applications. Excellent performance till there is a breakdown! Breakdowns are time consuming, costly and a lot of times the local suppliers are not able to handle major repairs thus resulting in scrapping of the pump.
For High Vacuum Distillations / Drying, it is absolutely necessary to maintain consistent High vacuum throughout the process duration. A drop in vacuum will see the process temperature and duration increase substantially. Also the final product could be susceptible to charring/burning or decomposition due to the drop in vacuum.
Secondly the vacuum systems are susceptible to corrosion and resultant heavy and expensive maintenance if the vapors are corrosive.