Water Horse Power (W.H.P.)
The calculated horse power coming out of the pump using the formula
WHP = head x gpm/3960
Watt
A measure of power. 746 watts equals one horsepower.
Wave spring
A disc washer used when axial space is at a premium. Does not
allow very much axial travel of the seal.
Wear ring
Used with closed impeller pumps to restrict leakage from the
high pressure side of the pump to the low pressure side. Should
be replaced when the recommended clearance is doubled.
Welded metal bellows
A seal design used to eliminate the use of elastomers. Excellent
for cryogenic and hot applications. Not as effective for hot petroleum
applications because of "coking" problems
Wet end
The part of the pump that gets wet from the pumping fluid. Includes
the volute, stuffing box, impeller wear rings, and shaft or sleeve