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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:
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W.G.
W.C.
Inches H2O
S.P.
Water Lift
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Water Gauge (plus a height dimension)
Water Column or Column of Water
Inches of Water (Column)
Static Pressure (usually in inches)
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.
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| 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 inch Hg. equals 14 inches of water. (okay, so it's 13.5951 inches
with a water temperature of 39.2 degrees 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!)
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| P.S.I. |
Pounds per Square Inch. Most commonly used
as a pressure term, but it can be a negative (vacuum) number. PSI = " Hg./2
thereabouts.
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| Torr
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Only used by the ultra-high vacuum people.
Equals one millimeter Hg. |
Read
"The Dreaded @ Symbol" next >
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about our industrial industrial vacuums,
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15 Iris Crescent,
Brampton, ONTARIO
L6Z 3H8
1- 888- 330- 3365
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See also:
industrial vacuums by air dynamics
Industrial Vacuums
and Cleaning Systems
IAS industrial vacuums
Mist and Dust Collectors
Commercial air filters, air purifiers & air cleaners
Central vacuum systems and industrial vacuums
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title: Industrial Vacuum Buyer's Tips
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