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

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.