Atmospheric
Pressure at Site Elevation
|
Feet
|
Meters
|
psia
|
Atm |
Bar (a)
|
kPa | kg/cm2 |
In Hg
|
Mm Hg
|
|
0
|
0
|
14.7
|
1.00 | 1.013 | 101 | 1.03 |
29.9
|
760
|
| 328 | 100 | 14.5 | 0.99 | 1.000 | 100 | 1.02 | 29.5 | 752 |
|
500
|
150
|
14.4
|
0.98 | 0.994 | 99.4 | 1.01 |
29.4
|
747
|
| 656 | 200 | 14.3 | 0.97 | 0.988 | 98.8 | 1.01 | 29.2 | 743 |
|
1000
|
300
|
14.2
|
0.96 | 0.976 | 97.6 | 1.00 |
28.9
|
734 |
| 1312 | 400 | 14.0 | 0.95 | 0.964 | 96.4 | 0.98 | 28.5 | 725 |
|
1500
|
450
|
13.9
|
0.94 | 0.956 | 95.6 | 0.98 |
28.3
|
719
|
| 2000 | 600 | 13.7 | 0.93 | 0.939 | 93.9 | 0.96 | 27.8 | 706 |
|
2500
|
750
|
13.4
|
0.91 | 0.923 | 92.3 | 0.94 |
27.3
|
694
|
|
3000
|
900
|
13.2
|
0.89 | 0.906 | 90.6 | 0.92 |
26.8
|
681
|
|
3500
|
1070
|
12.9
|
0.88 | 0.888 | 88.8 | 0.91 |
26.3
|
668
|
|
4000
|
1220
|
12.7
|
0.86 | 0.871 | 87.1 | 0.89 |
25.8
|
655
|
|
4500
|
1370
|
12.4
|
0.85 | 0.858 | 85.8 | 0.87 |
25.4
|
645
|
|
5000
|
1520
|
12.2
|
0.83 | 0.842 | 84.2 | 0.86 |
24.9
|
633
|
|
5500
|
1680
|
12.0
|
0.81 | 0.825 | 82.5 | 0.84 |
24.4
|
620
|
|
6000
|
1830
|
11.8
|
0.80 | 0.811 | 81.1 | 0.83 |
24.0
|
610
|
|
6500
|
1980
|
11.5
|
0.78 | 0.794 | 79.4 | 0.81 |
23.5
|
597
|
|
7000
|
2130
|
11.3
|
0.77 | 0.781 | 78.1 | 0.80 |
23.1
|
587
|
|
7500
|
2290
|
11.1
|
0.76 | 0.767 | 76.7 | 0.78 |
22.7
|
577
|
|
8000
|
2440
|
10.9
|
0.74 | 0.750 | 75.0 | 0.76 |
22.2
|
564
|
|
8500
|
2590
|
10.7
|
0.73 | 0.737 | 73.7 | 0.75 |
21.8
|
554
|
| Impact of
elevation on air separation plant capacity and power
To provide a pre-determined amount of air to an air separation processes (as measured
by weight or standard volumes such as SCF or Nm3 ) air
compressors that will be operated at higher elevations must process
greater physical volumes of air (actual cubic feet or actual cubic meters)
than would be required if the plant were located near sea level.
At higher elevations, more power is required to deliver the same amount of compressed air (actual weight or volume) to the air separation process. This is because the pressure ratio across the air compressor will be greater at higher elevations when the air feed is compressed to the design operating pressure as measured in absolute pressure units. This table can be used to determine the required inlet capacity for new air compression equipment. It can also be used, with the aid of general compressor performance relationships or specific compressor performance curves, to estimate changes in performance for relocated air compression equipment. |
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