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Math Formulas and Conversion Factors

These formulas and conversion factors are given on all Plant Maintenance tests. Although you do not need to memorize them, you should be familiar with them.

1 cubic foot = 1,728 cubic inches
1 cubic foot of water weighs 62.43 pounds
1 day = 1,440 minutes
1 cubic foot/second = 449 gallons/minute
1 horsepower = 33,000 foot-pounds/minute
1 kilowatt = 1000 watts
1 horsepower = 42.45 Btu/minute
1 Btu = 778 foot-pounds
1 cubic foot = 7.48 gallons
Coefficients of thermal expansion =0.00000633/F° for steel, 0.00001/F° for brass
1 gallon of water weighs 8.34 pounds
1 MGD = 694 gallons/minute
1 psi = 2.31 feet of water
1 horsepower = 746 watts
1 MGD = 1.55 cubic feet/second
1 watt = 3.412 Btu/hour
1 therm = 100,000 Btu

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