Thermodynamic properties of saturated steam
(condensed table)

Gauge Pressure (psig)
Absolute
Pressure
(psia)
Steam
Temp (ºF)
Enthalpy of Sat. liquid (Btu/lb)
Latent Heat (Btu/lb)
Enthalpy of Steam (Btu/lb) 
Specific Volume 
(ft3/lb)
(density)-1

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In a Vacuum

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29.74
0.0885
32
0.00
1075.8
1075.8
3306.00
29.52
0.2
53.14
21.21
1063.8
1085.0
1526.00
27.89
1.0
101.74
69.70
1036.3
1106.0
333.60
19.74
5.0
162.24
130.13
1001.0
1131.1
73.52
9.56
10.0
193.21
161.17
982.1
1143.3
38.42
7.54
11.0
197.75
165.73
979.3
1145.0
35.14
5.49
12.0
201.96
169.96
976.6
1146.6
32.40
3.45
13.0
205.88
173.91
974.2
1148.1
30.06
1.42
14.0
209.56
177.61
971.9
1149.5
28.04
--Psig--

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0.0 
14.696 
 212.00
180.07 
 970.3
 1150.4
26.80 
 1.3
 16.0
 216.32
 184.42
 967.6
 1152.0
 24.75
 2.3
 17.0
 219.44
 187.56
 965.5
 1153.1
 23.39
 5.3
 20.0
 227.96
 196.16
 960.1
 1156.3
 20.09
 10.3
 25.0
 240.07
 208.42
 952.1
 1160.6
 16.30
 15.3
 30.0
 250.33
 218.82
 945.3
 1164.1
 13.75
 20.3
 35.0
 259.28
 227.91
 939.2
 1167.1
 11.90
 25.3
 40.0
 267.25
 236.03
 933.7
 1169.7
 10.50
 30.3
 45.0
 274.44
 243.36
 928.6
 1172.0
 9.40
 40.3
 55.0
 287.07
 256.30
 919.6
 1175.9
 7.79
 50.3
 65.0
 297.97
 267.50
 911.6
 1179.1
 6.66
 60.3
 75.0
 307.60
 277.43
 904.5
 1181.9
 5.82
 70.3
 85.0
 316.25
 286.39
 897.8
 1184.2
 5.17
 80.3
 95.0
 324.12
 294.56
 891.7
 1186.2
 4.65
 90.3
 105.0
 331.36
 302.10
 886.0
 1188.1
 4.23
 100.0
 114.7
 337.90
 308.80
 880.0
 1188.8
 3.88
 110.3
 125.0
 344.33
 315.68
 875.4
 1191.1
 3.59
 120.3
 135.0
 350.21
 321.85
 870.6
 1192.4
 3.33
 125.3
 140.0
 353.02
 324.82
 868.2
 1193.0
 3.22
 130.3
 145.0
 355.76
 327.70
 865.8
 1193.5
 3.11
 140.3
155.0
 360.50
 333.24
 861.3
 1194.6
 2.92
 150.3
165.0
 365.99
 338.53
 857.1
 1195.6
 2.75
 160.3
 175.0
 370.75
 343.57
 852.8
 1196.5
 2.60
 180.3
 195.0
 379.67
 353.10
 844.9
 1198.0
 2.34
 200.3
 215.0
 387.89
 361.91
 837.4
  1199.3 
 2.13
 225.3
 240.0
 397.37
 372.12
 828.5
 1200.6
 1.92
 250.3
 265.0
 406.11
 381.60
 820.1
 1201.7
 1.74
 -
 300.0
 417.33
 393.84
 809.0
 1202.8
 1.54
 -
 400.0
 444.59
 424.00
 780.5
 1204.5
 1.16
 -
 450.0
 456.28
 437.20
 767.4
1204.6
 1.03
 -
 500.0
 467.01
 449.40
 755.0
1204.4
 0.93
 -
 600.0
 486.21
 471.60
 731.6
1203.2
 0.77
 -
 900.0
 531.98
 526.60
 668.8
1195.4
 0.50
 -
 1200.0
 567.22
 571.70
 611.7
1183.4
 0.36
 -
 1500.0
 596.23
 611.60
 556.3
1167.9 
 0.28
 -
 1700.0
 613.15
 636.30
 519.6
 1155.9
 0.24
 -
 2000.0
 635.82
 671.70
 463.4
 1135.1
 0.19
 -
 2500.0
 668.13
 730.60
 360.5
 1091.1 
 0.13
 

Steam Loss Chart

Monetary loss due to blowing traps in the system can have a dramatic effect on the  bottom line.  The chart below is based a steam cost of $ 8.00/1,000 lbs. of steam produced.

 

Orifice
Size

 5 PSI 15 PSI 30 PSI 50 PSI 75 PSI 100 PSI 125 PSI
.03 130.66 197.74 296.62 431.32 594.56 62.44 928.33
.125 520.24 790.98 1,186.46 1725.27 2,378.23 3,049.77 3,713.34
.25 2,080.96 4,745.85 3,163.90 6,901.13 9,512.94 12,199.07 14,855.30

To compute steam loss through an orifice:

24.24 x PSIA x (diameter of orifice in inches)

To convert psi to PSIA: 

add 14.7.  Therefore, 100 PSI steam is 114.7 PSIA (absolute)

Example: Compute steam loss through a 1/8" orifice at 100 PSI steam?

24.24 x 114.7 x (.125 x .125) = 43.44 

To estimate total cost of system-wide loss:  Multiply the steam loss by hours of operation, steam cost (usually between $4.00 and $14.00 per 1,000 lbs.) and by the number of faulty traps.

 

Steam Loss Chart
Estimated $ in Steam Loss Per Year
% Traps Failed Open

Number of Traps
  250 500 1000 5000 10,000
15% $35,478 $70,956 $141,912 $709,560 $1,419,120
20% $47,304 $94,608 $189,216 $946,080 $1,892,160
25% $59.130 $118,260 $236,520 $1,182,600 $2,365,200
30% $70,956 $141,912 $283,824 $1,419,120 $2,838,240
35% $82,782 $165,564 $331,128 $1,655,640 $3,311,280
40% $94,608 $189,216 $378,432 $1,892,160 $3,784,320
45% $106,434 $212,868 $425,736 $2,128,680 $4,257,360
50% $118,260 $236,520 $473,040 $2,365,200  $4,730,400