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Dr-Fix-It Illustrates The Properties of Saturated Steam.
A Chart Showing The properties of Saturated Steam, Definition of Terms and practical example. Dr-Fix-It Illustrates The Properties of Saturated Steam with regard to Temperature, Sensible Heat, Latent Heat, Total Heat and Specific Volume
 
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The Properties of Saturated Steam

Gauge Pressure
PSIG
Temperature
Degrees F
Sensible Heat
BTU/lb
Latent Heat
BTU/lb
Total Heat
BTU/lb
Specific Volume
Cu Ft / lb
0 212 180 971 1151 26.8
10 239 207 953 1160 16.5
20 259 227 939 1166 11.9
30 274 243 929 1172 9.46
40 286 256 920 1176 7.82
50 298 267 912 1179 6.68
60 307 277 906 1183 5.84
70 316 286 898 1184 5.19
80 324 294 891 1185 4.45
90 331 302 886 1188 4.25
100 338 309 880 1189 3.89
150 366 339 857 1196 2.74
200 388 362 837 1199 2.14
250 406 382 820 1202 1.75
300 421 398 805 1203 1.47
350 435 414 790 1204 1.27
400 448 428 777 1205 1.12
450 460 439 766 1205 1.00
500 470 453 751 1204 0.89

Gauge Pressure

The pressure inside the vessel in pounds per square inch (gauge).

Temperature

The temperature of steam at a specified pressure.

Sensible Heat

The heat energy per pound that is given off to bring the pound of steam to 32 degrees Fahrenheit.

Latent Heat

The heat energy per pound of steam that is given off when the entire pound of steam condenses to a liquid state.

Total Heat

The sum of Sensible Heat and Latent Heat. The heat energy per pound of steam that is given off when the entire pound of steam condenses and cools to 32 degrees Fahrenheit.

Specific Volume

The amount of volume in Cubic Feet that one pound of steam will occupy at a specified pressure.

Example

For example, a radiator has an internal steam volume of 16.5 cubic feet. One pound of steam at 10 PSIG would occupy the entire internal volume of that radiator and the total amount of heat available would be 1160 BTU.

Now, lets crank our example boiler up to 450 PSIG. Now, one pound of steam occupies 1 cubic foot of volume at this pressure. The example radiator will now hold 16.5 x 1 = 16.5 pounds of steam. 16.5 pounds x 1205 BTU's total heat per pound =19882.5 BTU's.



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