Full Vacuum Service?
Full Vacuum Service?
(OP)
Newbie question:
When manufacturers mean 'full vacuum service', are they referring to 0 psia (0 inHG)?? I've seen some specs that mention 'full vacuum service' as 29.9 inHG. Maybe they use atmospheric as the beginning of vacuum.
Just checking.
Thanks
When manufacturers mean 'full vacuum service', are they referring to 0 psia (0 inHG)?? I've seen some specs that mention 'full vacuum service' as 29.9 inHG. Maybe they use atmospheric as the beginning of vacuum.
Just checking.
Thanks





RE: Full Vacuum Service?
Our original vessels were F.V. and 15 PSIG while the later ones were designed for F.V. and 60 PSIG
RE: Full Vacuum Service?
Vacuum, in the truest sense, should be measured in Absolute pressure. This is a pressure value measured from absolute zero pressure, i.e., from an absolute vacuum base starting point. Note: often some scientists and engineers are delinquent in using the term "vacuum" when they mean a negative value from the base point of atmospheric pressure. This is often results in confusion and misunderstanding. Absolute pressure is the recommended usage because it is precisely that - absolute.
Here are the equivalents of vacuum measurement units:
1 Atmosphere = 14.696 psia
= 101.325 pascals
= 760 mm mercury
= 760 torr
= 760,000 microns mercury
= 29.94 inches mercury absolute (@ 32 oF)
1 Bar = 14.5 psia
I hope this helps you out.
Art Montemayor
Spring, TX