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Compress Air Two-Stage Compression Table Chart

Hydraulic & Pneumatics
Fluids Design and Engineering Data

Horsepower Required to Compress Air, Two-Stage Compression

Horsepower required to compress one cubic foot of free air per minute (isothermally and adiabatically) from atmospheric pressure (14.7 pounds per square inch) to various gage pressures. Two-Stage Compression, initial temperature of air, 60°F, jacket cooling not considered.

Gage
Pressure,
Pounds
Absolute
Pressure,
Pounds
Number
of
Atm.
Correct
Ratio of
Cylinder
Volumes
Intercooler
Gage
Pressure
Isothermal
Compression
Adiabatic Compression
Percentage
of
Saving
over
One-stage
Compression
Mean
Effective
Pressure
*
HP
Mean
Eff.
Pressure,
*
Theoretical
Mean
Eff.
Pressure
plus
15%t
Friction
Horsepower,
Theoretical
HP
plus 15%
Friction
50
60
70
80
90
100
110
120
130
140
150
160
170
180
190
200
210
220
230
240
250
260
270
280
290
300
350
400
450
500
64.7
74.7
84.7
94.7
104.7
114.7
124.7
134.7
144.7
154.7
164.7
174.7
184.7
194.7
204.7
214.7
224.7
234.7
244.7
254.7
264.7
274.7
284.7
294.7
304.7
314.7
364.7
414.7
464.7
514.7
4.40
5.08
5.76
6.44
7.12
7.80
8.48
9.16
9.84
10.52
11.20
11.88
12.56
13.24
13.92
14.60
15.28
15.96
16.64
17.32
18.00
18.68
19.36
20.04
20.72
21.40
24.80
28.20
31.60
35.01
2.10
2.25
2.40
2.54
2.67
2.79
2.91
3.03
3.14
3.24
3.35
3.45
3.54
3.64
3.73
3.82
3.91
3.99
4.08
4.17
4.24
4.32
4.40
4.48
4.55
4.63
4.98
5.31
5.61
5.91
16.2
18.4
20.6
22.7
24.5
26.3
28.1
29.8
31.5
32.9
34.5
36.1
37.3
38.8
40.1
41.4
42.8
44.0
45.3
46.6
47.6
48.8
50.0
51.1
52.2
53.4
58.5
63.3
67.8
72.1
21.80
23.90
25.70
27.52
28.93
30.30
31.42
32.60
33.75
34.67
35.59
36.30
37.20
38.10
38.80
39.50
40.10
40.70
41.30
41.90
42.70
43.00
43.50
44.00
44.50
45.80
47.30
49.20
51.20
52.70
0.095
0.104
0.112
0.120
0.126
0.132
0.137
0.142
0.147
0.151
0.155
0.158
0.162
0.166
0.169
0.172
0.174
0.177
0.180
0.183
0.186
0.188
0.190
0.192
0.194
0.197
0.206
0.214
0.223
0.229
24.30
27.20
29.31
31.44
33.37
35.20
36.82
38.44
39.86
41.28
42.60
43.82
44.93
46.05
47.16
48.18
49.35
50.30
51.30
52.25
52.84
53.85
54.60
55.50
56.20
56.70
60.15
63.19
65.93
68.46
27.90
31.30
33.71
36.15
38.36
40.48
42.34
44.20
45.83
47.47
48.99
50.39
51.66
52.95
54.22
55.39
56.70
57.70
59.10
60.10
60.76
62.05
62.90
63.85
64.75
65.20
69.16
72.65
75.81
78.72
0.106
0.118
0.128
0.137
0.145
0.153
0.161
0.168
0.174
0.180
0.186
0.191
0.196
0.201
0.206
0.210
0.216
0.220
0.224
0.228
0.230
0.235
0.238
0.242
0.246
0.247
0.262
0.276
0.287
0.298
0.123
0.136
0.147
0.158
0.167
0.176
0.185
0.193
0.200
0.207
0.214
0.219
0.225
0.231
0.236
0.241
0.247
0.252
0.257
0.262
0.264
0.270
0.274
0.278
0.282
0.283
0.301
0.317
0.329
0.342
10.9
11.3
12.3
13.8
14.2
15.0
15.2
15.6
16.3
16.7
16.9
18.4
19.0
19.3
19.5
20.1
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* Mean Effective Pressure (MEP) is defined as that single pressure rise, above atmospheric, which would require the same horsepower as the actual varying pressures during compression.

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