Gage
Pressure,
Pounds

Absolute
Pressure,
Pounds

Number
of
Atm

Correct
Ratio
of
Cylinder
Volumes

Intercooler
Gage Pressure,
First
and
Second
Stages

Isothermal Compression

Adiabatic Compression

%
of Saving
over
Two-stage
Compression

Mean
Effective
Pressure*

Hpr

Mean Eff.
Pressure,
*
Theoretical

Mean
Eff.
Pressure plus15%
Friction

Hp
Theoretical

HP
plus
15%
Friction

100
150
200
250
300
350
400
450
500
550
600
650
700
750
800
850
900
950
1000
1050
1100
1150
1200
1250
1300
1350
1400
1450
1500
1550
1600

114.7
164.7
214.7
264.7
314.7
364.7
414.7
464.7
514.7
564.7
614.7
664.7
714.7
764.7
814.7
864.7
914.7
964.7
1014.7
1064.7
1114.7
1164.7
1214.7
1264.7
1314.7
1364.7
1414.7
1464.7
1514.7
1564.7
1614.7

7.8
11.2
14.6
18.0
21.4
24.8
28.2
31.6
35.0
38.4
41.8
45.2
48.6
52.0
55.4
58.8
62.2
65.6
69.0
72.4
75.8
79.2
82.6
86.0
89.4
92.8
96.2
99.6
103.0
106.4
109.8

1.98
2.24
2.44
2.62
2.78
2.92
3.04
3.16
3.27
3.38
3.47
3.56
3.65
3.73
3.82
3.89
3.95
4.03
4.11
4.15
4.23
4.30
4.33
4.42
4.48
4.53
4.58
4.64
4.69
4.74
4.79

14.4 - 42.9
18.2 - 59.0
21.2 - 73.0
23.8 - 86.1
26.1 - 98.7
28.2 - 110.5
30.0 - 121.0
31.8 - 132.3
33.4 - 142.4
35.0 - 153.1
36.3 - 162.3
37.6 - 171.5
38.9 - 180.8
40.1 - 189.8
41.4 - 199.5
42.5 - 207.8
43.4 - 214.6
44.6 - 224.5
45.7 - 233.3
46.3 - 238.3
47.5 - 248.3
48.5 - 256.8
49.0 - 261.3
50.3 - 272.3
51.3 - 280.8
52.0 - 287.3
52.6 - 293.5
53.5 - 301.5
54.3 - 309.3
55.0 - 317.3
55.8 - 323.3

30.30
35.59
39.50
42.70
45.30
47.30
49.20
51.20
52.70
53.75
54.85
56.00
57.15
58.10
59.00
60.20
60.80
61.72
62.40
63.10
63.80
64.40
65.00
65.60
66.30
66.70
67.00
67.70
68.30
68.80
69.10

0.132
0.155
0.172
0.186
0.197
0.206
0.214
0.223
0.229
0.234
0.239
0.244
0.249
0.253
0.257
0.262
0.265
0.269
0.272
0.275
0.278
0.281
0.283
0.286
0.289
0.291
0.292
0.295
0.298
0.300
0.302

33.30
40.30
45.20
49.20
52.70
55.45
58.25
60.40
62.30
65.00
66.85
67.90
69.40
70.75
72.45
73.75
74.80
76.10
77.20
78.10
79.10
80.15
81.00
82.00
82.90
84.00
84.60
85.30
85.80
86.80
87.60

38.30
46.50
52.00
56.60
60.70
63.80
66.90
69.40
71.70
74.75
76.90
78.15
79.85
81.40
83.25
84.90
86.00
87.50
88.80
90.10
91.10
92.20
93.15
94.30
95.30
96.60
97.30
98.20
98.80
99.85
100.80

0.145
0.175
0.196
0.214
0.229
0.242
0.253
0.263
0.273
0.283
0.291
0.296
0.303
0.309
0.315
0.321
0.326
0.331
0.336
0.340
0.344
0.349
0.353
0.357
0.362
0.366
0.368
0.371
0.374
0.378
0.382

0.167
0.202
0.226
0.246
0.264
0.277
0.292
0.302
0.314
0.326
0.334
0.340
0.348
0.355
0.362
0.369
0.375
0.381
0.383
0.391
0.396
0.401
0.405
0.411
0.416
0.421
0.423
0.426
0.430
0.434
0.438

5.23
5.92
6.67
6.96
7.28
7.64
8.33
8.36
8.38
8.80
8.86
9.02
9.18
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