Steam power plants, their design and construction . ngths varying from 90 to250 feet. The formula derived from the experiments checks veryclosely with the results obtained by M. Ledoux, who experi- STEAM POWER PLANTS. 89 merited with pipes varying from inches to inches indiameter and with lengths varying from 328 feet to 1,082 Carpenter uses the formula P= ^i{ ^+ ) ,, ,5 \ d / ^^ in which P equals the loss of pressure in pounds per square inch,d the diameter of the pipe in inches, W the flow of steam in poundsper minute, w the flow in pounds per second, D the de
Steam power plants, their design and construction . ngths varying from 90 to250 feet. The formula derived from the experiments checks veryclosely with the results obtained by M. Ledoux, who experi- STEAM POWER PLANTS. 89 merited with pipes varying from inches to inches indiameter and with lengths varying from 328 feet to 1,082 Carpenter uses the formula P= ^i{ ^+ ) ,, ,5 \ d / ^^ in which P equals the loss of pressure in pounds per square inch,d the diameter of the pipe in inches, W the flow of steam in poundsper minute, w the flow in pounds per second, D the density orweight per cubic foot, L the length of pipe in feet and K a constanttaken, as a result of the experiment, at .0027. Table 11., whichwas calculated by Mr. E. C. Sickles, is based upon the formulaand was deduced by making every factor constant except thediameter, length of pipe, and discharge. The left-hand verticalcolumn of the table contains the diameters {d) of the pipes, andthe top horizontal column the length (L) in feet, while the body. Figure 35.—Pipe Support Designed by Dean & Main. of the table gives values of {W) the pounds discharged perminute. Prof. Carpenter explains the table as follows: Thus, for instance, a lo-inch pipe 250 feet long will deliver712 pounds of steam per minute with a drop of one pound inpressure, if there exists an average absolute pressure of 100pounds; or, if all other conditions hold except the length ofpipe, which varies, it may be seen that for 100 feet the dischargeis 1,126 pounds, for 400 feet 563 pounds, and so for any num-ber of feet given in the table. If any intermediate length of pipe is used other than thosegiven in the tables, the discharges given by the tables may becorrected bv consideration of the fact that the wcii^ht of dis- 90 STEAM POWER PLANTS, charge is inversely proportional to the square root of the lengthof the pipe. *To meet the conditions where other average absolute pressuresthan 100 pounds exist, and higher d
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