Posted by cadet trooper on October 21, 2008 at 15:23:20 from (69.223.32.13):
In Reply to: OT- Vacuum Pumps posted by TimWafer on October 21, 2008 at 06:50:07:
You're dealing with a fluid dynamics problem that is hard to overcome on one hand distance of head causes problems with standard pumps and lift causes problems with vacuum pumps. My guess is it will be a trade off to the laws of gravity. The best thing I've seen for something like this is an air pump like a Sandpiper, however the air demand is high and could require a 3/4" air line. The best way to figure vacuum is everything is in the negative and is figured in Hg or inches of Mercury and rarely goes higher than barometric pressure. I'm sure there is a fluid dynamics specialist on here that can chime in I'm certainly not one. Good Luck
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