This is a quick lesson in pressure and vacuum terminology.
There are a few common pressure terms that need to be
understood if you're going to talk vacuum with those of us in the business. Here they are:
W.G.
W.C.
Inches H20
S.P.
Water Lift
These are all the same thing. They can reference pressure or
vacuum, but is normally associated with dust collector fan performance. In
vacuum systems, it's most often used when talking about pressure
differential across a filter media.
Inches Hg.
Inches of Mercury or Column of Mercury in inches. A measurement of vacuum,
rarely used for pressure indication. The most common vacuum designation for the
industrial class of vacuum systems.
For those really interested, 1" Hg. equals 14" of water. Okay, so
it's 13.5951" with a water temperature of 39.2° F, but who can
remember that?
"Full" or "Absolute" vacuum is 29.92" Hg. Most common high
vacuum type conveying systems top out at 27" Hg. And if you can't convey with
that, think of some other way!
P.S.I.
Pounds per Square Inch. Most commonly used as a pressure term, but it can be a
negative (vacuum) number. PSI = inches Hg./2 thereabouts.
Torr
Only used by the ultra-high vacuum people. Equals 1mm Hg.
To get fast answers to your questions about our
industrial vacuums, please call us immediately at 1-717-854-4050!
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1-717-854-4050
