Table 94: System pressures
1
Gauge
Absolute
Inches of mercury
(HG) below one
standard atmosphere
psia
Millimeters of
mercury (HG)
Microns
Boiling temperatures
of water °F
0 in. 14.6960 760.00 760,000 212
10.240 in. 9.6290 500.00 500,000 192
22.050 in. 3.8650 200.00 200,000 151
25.980 in. 1.9350 100.00 100,000 124
27.950 in. 0.9680 50.00 50,000 101
28.940 in. 0.4810 25.00 25,000 78
29.530 in. 0.1920 10.00 10,000 52
29.670 in. 0.1220 6.30 6,300 40
29.720 in. 0.0990 5.00 5,000 35
29.842 in. 0.0390 2.00 2,000 15
29.882 in. 0.0190 1.00 1,000 1
29.901 in. 0.0100 0.50 500 –11
29.917 in. 0.0020 0.10 100 –38
29.919 in. 0.0010 0.05 50 –50
29.9206 in. 0.0002 0.01 10 –70
29.921 in. 0 0 0
1 One standard atmosphere = 14.696 PSIA = 760 mm Hg. absolute pressure at 32°F = 29.921 inches Hg. absolute at 32°F
Note: psig = lb per sq. in. gauge pressure = Pressure above atmosphere
psia = lb per sq. in. absolute pressure = Sum of gauge plus atmospheric pressure
Figure 55: Evacuation of chiller operation
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