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The factor of Evaporation is used to adust rated boiler output (from and at 212 degrees F.) to actual temperture and expected boiler perating pressure (psig) affect the boiler output ratings which are based on "from and at 212 degrees F.)

Example: A boiler is to have an output of 3060 pounds of steam/hour when operating at 10 psig with feedwater 100 degrees F. What should the boiler rating be on the basis of from and at 212 degrees F?

Solution: From the following chart, at 100 degrees F. and 10 psig, we obtain the factor 30.6 pounds of steam/BHP. This factor is used to convert to the "from and at 212 degrees F." rating basis.

3060 / 30.6 = 100 HP rated boiler should be selected.

 

Feed-
Water
Temp

Gauge Pressure - psig
0
2
10
15
20
40
50
60
80
30
29.0
29.0
28.8
28.7
28.6
28.4
28.3
28.2
28.1
40
29.3
29.2
29.1
29.0
28.9
28.7
28.6
28.5
28.4
50
29.6
29.5
29.3
29.2
29.1
28.9
28.8
28.8
28.7
60
29.8
29.8
29.6
29.5
29.4
29.2
29.1
29.0
28.9
70
30.1
30.0
29.9
29.8
29.7
29.5
29.4
29.3
29.2
80
30.4
30.3
30.1
30.0
30.0
29.8
29.6
29.6
29.5
90
30.6
30.6
30.4
30.3
30.2
30.0
29.9
29.8
29.7
100
30.9
30.8
30.6
30.6
30.5
30.3
30.2
30.1
30.0
110
31.2
31.2
30.9
30.8
30.8
30.6
30.4
30.3
30.2
120
31.5
31.4
31.2
31.2
31.1
30.8
30.7
30.6
30.5
130
31.8
31.7
31.5
31.4
31.4
31.1
31.0
30.9
30.8
140
32.1
32.0
31.8
31.7
31.6
31.4
31.3
31.2
31.1
150
32.4
32.4
32.1
32.0
31.9
31.7
31.6
31.5
31.4
160
32.7
32.7
32.4
32.4
32.3
32.0
31.9
31.8
31.7
170
33.0
33.0
32.7
32.6
32.6
32.3
32.2
32.1
32.0
180
33.4
33.3
33.0
33.0
32.9
32.6
32.5
32.4
32.3
190
33.8
33.7
33.4
33.3
33.2
32.9
32.8
32.7
32.6
200
34.1
34.0
33.7
33.6
33.5
33.2
33.1
33.0
32.9
212
34.5
34.4
34.2
34.1
33.0
33.6
33.5
33.4
33.3
220
34.8
34.7
34.4
34.3
34.2
33.9
33.8
33.7
33.5
227
35.0
34.9
34.7
34.5
34.4
34.1
34.0
33.9
33.8
230
35.2
35.0
34.8
34.7
34.5
34.2
34.1
34.0
33.9

Feed-
Water
Temp

Gauge Pressure - psig
100
140
150
160
180
200
220
240
30
28.0
28.0
27.9
27.9
27.0
27.9
27.9
27.8
40
28.3
28.2
28.2
28.2
28.2
28.1
28.1
28.1
50
28.6
28.5
28.4
28.4
28.4
28.3
28.3
28.3
60
28.8
28.7
28.7
28.6
28.6
28.6
28.6
28.5
70
29.1
29.0
28.9
28.9
28.9
28.8
28.8
28.8
80
29.3
29.2
29.2
29.2
29.1
29.1
29.1
29.0
90
29.6
29.5
29.4
29.4
29.4
29.3
29.3
29.3
100
29.8
29.8
29.7
29.7
29.7
29.6
29.6
29.6
110
30.0
30.0
30.0
30.0
29.9
29.9
29.8
29.8
120
30.4
30.3
30.2
30.2
30.2
30.1
30.1
30.1
130
30.7
30.6
30.5
30.5
30.4
30.4
30.4
30.4
140
31.0
30.8
30.8
30.8
30.8
30.7
30.7
30.6
150
31.2
31.2
31.1
31.1
31.0
31.0
30.9
30.9
160
31.5
31.4
31.4
31.4
31.3
31.3
31.2
31.2
170
31.8
31.7
31.7
31.6
31.6
31.6
31.5
31.5
180
32.2
32.0
32.0
32.0
31.9
31.9
31.8
31.8
190
32.5
32.4
32.3
32.3
32.3
32.2
32.1
32.1
200
32.8
32.6
32.6
32.6
32.6
32.5
32.4
32.4
212
33.2
33.0
33.0
33.0
32.9
32.9
32.8
32.8
220
33.4
33.3
33.2
33.2
33.1
33.1
33.1
33.0
227
33.7
33.5
33.5
33.4
33.4
33.3
33.3
33.3
230
33.8
33.6
33.6
33.5
33.5
33.4
33.4
33.4

 
 
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