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Baker Hughes
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Table 1 - Equilibrium Moisture Contents of Natural Gases Above the Critical Temperature
PSIA
°F
14.7
100
200
300
400
500
600
700
800
900
1000
-40
9.10
1.50
0.88
0.66
0.55
0.49
0.44
0.41
0.39
0.37
0.36
-36
11.5
1.90
1.10
0.80
0.68
0.59
0.54
0.50
0.47
0.45
0.43
-32
14.4
2.40
1.30
0.99
0.82
0.72
0.65
0.60
0.57
0.54
0.51
-28
17.8
2.90
1.60
1.20
1.00
0.87
0.79
0.72
0.68
0.64
0.61
-24
22.0
3.60
2.00
1.50
1.20
1.10
0.95
0.87
0.81
0.77
0.73
-20
27.0
4.40
2.40
1.80
1.50
1.30
1.10
1.00
0.97
0.92
0.87
-16
33.1
5.40
3.00
2.20
1.80
1.50
1.40
1.20
1.20
1.10
1.00
-12
40.5
6.50
3.60
2.60
2.10
1.80
1.60
1.50
1.40
1.30
1.20
-8
49.3
7.90
4.30
3.10
2.50
2.20
1.90
1.80
1.60
1.50
1.50
-4
59.8
9.50
5.20
3.70
3.00
2.60
2.30
2.10
1.90
1.80
1.70
0
72.1
11.4
6.20
4.50
3.60
3.10
2.70
2.50
2.30
2.10
2.00
4
86.8
13.7
7.40
5.30
4.30
3.60
3.20
2.90
2.70
2.50
2.40
8
104
16.4
8.80
6.30
5.10
4.30
3.80
3.40
3.20
3.00
2.80
12
124
19.5
10.5
7.50
6.00
5.10
4.50
4.00
3.70
3.50
3.30
16
148
23.2
12.4
8.80
7.00
5.90
5.20
4.70
4.30
4.00
3.80
20
176
27.4
14.6
10.4
8.20
7.00
6.10
5.50
5.10
4.70
4.40
24
208
32.4
17.2
12.2
9.70
8.20
7.20
6.40
5.90
5.50
5.10
28
246
38.1
20.2
14.3
11.3
9.50
8.30
7.50
6.80
6.30
5.90
32
289
44.7
23.7
16.7
13.2
11.1
9.70
8.70
7.90
7.30
6.90
34
313
48.4
25.6
18.0
14.2
11.9
10.4
9.30
8.50
7.90
7.40
36
339
52.4
27.7
19.4
15.3
12.9
11.2
10.0
9.20
8.50
7.90
38
367
56.6
29.9
20.1
16.5
13.9
12.1
10.8
9.80
9.10
8.50
40
396
61.1
32.2
22.6
17.8
14.9
13.0
11.6
10.6
9.80
9.10
The Table above can be used as follows:
Assume that the pipeline pressure is 1000 psig at 40°F. This gas can hold 9.1 Ib./mmscf of water.
Assume that the pressure will be cut from 1000 psig to 100 psig at the supply regulator.
Assume that for every 100 psjg drop in pressure the gas will drop 7°F in temperature. In this case, the temperature will
drop from 40°F to -23°F (1000 psig - 100 psig / 100 psig x 7°F =63°F).
From the table, look up 100 psig and -23°F (or the closest value). If the number is below 7 lb./mmscf, water will fallout of
the gas and the desiccant should be replaced once a year to prevent problems as a result of freezing.
The above test procedure indicates the predicted service life of the Becker FD-1500 filter/dryer cartridge assembly.
Should you require any additional information or assistance please feel free to contact Becker Technical assistance.
Reference: Gas Engineers Handbook 1st Edition
