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Vacuum System Technology Questions And Answers

May 02, 2018

If you are using vacuum system technology, the following questions may help you,


Q: What's the advantage of a single, high efficiency vacuum pump instead of a single, high efficiency pressure system?

A: The type of material and the distance you are conveying will be the main factors in determining whether a pressure or vacuum system is best for you but…if a high-capacity vacuum pump will do the job, you will save in initial cost and in maintenance costs for the life of the system.

Q: What measures can be taken to prevent the formation of granules in the conveyor line while increasing the capacity at the maximum limit?

A: There are many reasons why a plug or block of material may form in a material series.

  • Tight elbow bends (less than 6-8 times diameter) increase pressure drop and decrease speed

  • Curved too close (less than 10' apart) - Same as above

  • System leaks can cause vacuum/speed loss

  • Blockage of receiver or pump filter may increase pressure drop and reduce vacuum

  • Too much air in the transfer line (filter of the probe tube carburetor should open about 50%) - no longer needed.

  • Finally - if you expand the system, your expected capacity may exceed the pump capacity

Q: What is the vacuum level of a traditional vacuum system?

A: The operational vacuum, for regenerative blowers, expressed in inches of mercury (Hg) is usually around 6 to 11 inches Hg, depending on whether it's a single or dual-stage pump.

Traditional vacuum displacement pumps generate around 10–12 inches Hg operating vacuum, compared to 14–15 inches Hg for high-vacuum pumps.

Q: Can high vacuum systems be used to convey dry air?

A: Yes, but purging with dry air takes time and will somewhat reduce total conveying capacity per hour.


Q: What happens when air pressure is not sufficient?

A: Whether you are talking about a pressure system that blows material through the lines, or a vacuum system that sucks material through the lines, insufficient air results in the same kinds of problems.

Pickup velocity may not be sufficient to get material moving

Even if the material does move through the lines, it may start to pile up at elbows or at other places in the line, causing line plugs.