Water Horsepower (whp or Whp)
Water Horsepower (whp or Whp) :
A unit of power used in the U.S. primarily in rating pumps. If a pump has a capacity of Q gallons per minute and develops a pressure ("head") of P feet of head, then its power rating is QP/3956 water horsepower. This calculation assumes the density of water to be 8-1/3 pounds per U.S. gallon, which is approximately correct but not exact. As a result, the water horsepower equals 746.043 watts (550.253 foot pounds per second), slightly more than the ordinary mechanical horsepower
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