Interactive tool. Converts a gauge, absolute, or vacuum reading, or a liquid-column height, into the others for a liquid of any specific gravity, with the site's atmospheric pressure estimated from its elevation or entered, in US or SI units.
This converter takes a gauge, absolute, or vacuum reading, or a liquid-column height, and returns the others for a liquid of any specific gravity or density, with the site's atmospheric pressure estimated from its elevation or entered directly, in US units or in SI with kPa or bar. Companion tool to Pressure: Absolute, Gauge, Atmospheric, and Elevation. Part of the pressure and head series.
The converter's results have been checked against a second calculation that takes a different route, in 4,000 randomized cases, and every displayed value agreed to the last digit. It also reproduced a worked example and a table of atmospheric pressures at altitude from a hydraulics reference.
Sample output
The converter's output for the worked example in Pressure: Absolute, Gauge, Atmospheric, and Elevation: a gauge reading of 7.37 psig at the base of a liquid of specific gravity 0.85, at Houston, about 50 ft above sea level, with the atmospheric pressure estimated from the site elevation.
Result
SG 0.85 at 50 ft
Gauge pressure (psig)
7.37
Vacuum below atmospheric (inHg | psi)
—
Absolute pressure (psia)
22.04
Atmospheric pressure used (psia | inHg)
14.67 | 29.87
Column of the liquid equivalent to the gauge pressure (ft)
20.00
Column of water equivalent to the gauge pressure (ft)
17.00
Column of the liquid equivalent to the absolute pressure (ft)
59.81
The printed record of the same example. Click the image to enlarge it.
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