Product Manual A

Prepared by: AAD Rev. #:0
Approved by: TED 2 Date:10/18/01
1200510
WATER HORSEPOWER - the theoretical power required to deliver a given quantity of water per minute
against a given head.
BRAKE HORSEPOWER -- Actual power as delivered by a motor or engine to a driven machine.
PUMP EFFICIENCY -- The quotient of the water horsepower divided by brake horsepower required to
produce it.
WATER HAMMER -- a series of shock waves produced in a pipeline or pump by a sudden change in
water velocity. A sudden change in flow velocity can result from rapid closure of valves. A pressure
wave is set up which travels back and forth in the water column at extremely high speed producing
rapid vibrations that may be violent and destructive if the water column is long.
THE MAXIMUM THEORETICAL LIFT of a pump is 34 feet, which is the pressure of the atmosphere at
sea level. The maximum practical total lift at sea level is 20 to 25 feet (depending on the type and
condition of the pump) and this decreases with drops in barometric pressure.
IF FURTHER INFORMATION IS NEEDED, CALL W.S. DARLEY & CO. AT
CHIPPEWA FALLS, WI. AT 800-634-7812 or 715-726-2650
CONVERSION FACTORS
One pound per square inch = 2.31 feet of water
= 2.04 inches of mercury