Handbook of Railroad Construction; For the use of American engineers. / Containing the necessary rules, tables, and formulæ for the location, construction, equipment, and management of railroads, as built in the United States.

by George L. Vose

EXAMPLE OF USE OF PRECEDING RULES.

Required the head of water necessary to send 1,333 cubic feet of water, or 10,000 gallons per hour, through an eight inch pipe one thousand feet long.

The velocity by rule one will be

1333 × 144
8² × .7854 = 3818 feet per hour, or 64 feet per minute.

By rule two (the value of C for 60 being 8.62, and for 70 11.40, that for 64 is 10 nearly), we have

10
8 + 0.134 = 1.23,

which multiplied by ten (the number of times that one hundred is contained in one thousand feet, the distance), gives the result, twelve inches or one foot, which is the required head; and if the entrance to the tank is twenty feet high, we have, as the necessary head, 20 + 1 = 21 feet.

394. The formula expressing the power of an engine to raise a given amount of water is

WV
33000.

Where W is the weight of a column of water, and V the velocity in feet per minute; also 33,000 the expression of a horse-power. For example, how many horse-power must an engine possess to raise one thousand cubic feet of water per hour through a six inch pipe fifty feet high?