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Section 9 - Maintenance
Figure 150 - Evacuation of chiller operation
Table 54 - System pressures
Gauge
Inches of mercury
(Hg) below one stan-
dard atmosphere
0 in.
10.240 in.
22.050 in.
25.980 in.
27.950 in.
28.940 in.
29.530 in.
29.670 in.
29.720 in.
29.842 in.
29.882 in.
29.901 in.
29.917 in.
29.919 in.
29.9206 in.
29.921 in.
Notes:
• One standard atmosphere = 14.696 psia = 760 mm Hg absolute pressure at 32°F = 29.921 in. Hg absolute at 32°F
• psig = pound per square inch gauge pressure = pressure above atmosphere
• psia = pound per square inch absolute pressure = sum of gauge plus atmospheric pressure
• Shell volume = L*π * r2= (Length in feet)*( 3.1416)*(radius squared) = cubic feet. To keep the units consistent, round the length and radius
to the nearest tenth of a foot.
• μm = Micron
310
Absolute
psia
Millimeters of
mercury (Hg)
14.6960
760.00
9.6290
500.00
3.8650
200.00
1.9350
100.00
0.9680
50.00
0.4810
25.00
0.1920
10.00
0.1220
6.30
0.0990
5.00
0.0390
2.00
0.0190
1.00
0.0100
0.50
0.0020
0.10
0.0010
0.05
0.0002
0.01
0
Microns
760,000
500,000
200,000
100,000
50,000
25,000
10,000
6,300
5,000
2,000
1,000
500
100
50
10
0
0
Form 201.23-NM2
Issue date: 12/19/2023
Boiling temperatures
of water, °F
212
192
151
124
101
78
52
40
35
15
1
–11
–38
–50
–70
-
Johnson Controls
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