RESULTS OF "IDALIA" TESTS _______________________________________________________________________ | | | | | | | |Date 1909 |Oct. 11|Oct. 14|Oct. 14|Oct. 12|Oct. 13| |_______________________________|_______|_______|_______|_______|_______| |Degrees of superheat Fahrenheit| 0 | 57 | 88 | 96 | 105 | |Pressures, pounds per} Throttle| 190 | 196 | 201 | 198 | 203 | |square inch above } First | | | | | | |Atmospheric Pressure } Receiver| 68.4 | 66.0 | 64.3 | 61.9 | 63.0 | | } Second | | | | | | | } Receiver| 9.7 | 9.2 | 8.7 | 7.8 | 8.4 | |Vacuum, inches | 25.5 | 25.9 | 25.9 | 25.4 | 25.2 | |Temperature, Degrees Fahrenheit| | | | | | | } Feed | 201 | 206 | 205 | 202 | 200 | | } Hot Well | 116 | 109.5 | 115 | 111.5 | 111 | | | | | | | | |Revolutions per minute | | | | | | | {Air Pump | 57 | 56 | 53 | 54 | 45 | | {Circulating Pump| 196 | 198 | 196 | 198 | 197 | | {Main Engine | 194.3 | 191.5 | 195.1 | 191.5 | 193.1 | |Indicated Horse Power, | | | | | | | Main Engine | 512.3 | 495.2 | 521.1 | 498.3 | 502.2 | |Water per hour, total pounds |9397 |8430 |8234 |7902 |7790 | |Water per indicated | | | | | | | Horse Power, pounds | 18.3 | 17.0 | 15.8 | 15.8 | 15.5 | |B. t. u. per minute per | | | | | | | indicated Horse Power | 314 | 300 | 284 | 286 | 283 | |Per cent Saving of Steam | ... | 7.1 | 13.7 | 13.7 | 15.3 | |Percent Saving of Fuel | | | | | | | (computed) | ... | 4.4 | 9.5 | 8.9 | 9.9 | |_______________________________|_______|_______|_______|_______|_______| The table shows that the saving in steam consumption with 105 degrees of superheat was 15.3 per cent and in heat consumption about 10 per cent. This may be safely stated to be a conservative representation of the saving that may be accomplished by the use of superheated steam in a plant as a whole, where superheated steam is furnished not only to the main engine but also to the auxiliaries. The figures may be taken as conservative for the reason that in addition to the saving as shown in the table, there would be in an ordinary plant a saving much greater than is generally realized in the drips, where the loss with saturated steam is greatly in excess of that with superheated steam.