SECTION II. DEFINITION OF UNUSUAL TERMS
UNUSUAL TERMS.
This section provides definitions for terms used in this manual which are not
defined in the United States Army Dictionary (AR 310-25).
The term appears on the
left of the hyphen, "-".
The definition for the term appears immediately to the
right of the hyphen, "-".
TERM
DEFINITIONS
Suction Pressure
Head
-The pressure against which a pump forces liquid,
expressed in feet.
Each pound of pressure per square
inch against which the liquid is forced is equivalent
to lifting a column of water 1 inch high square 2.31
feet high.
The head includes the height to which the
liquid must be raised plus the force required to
overcome friction losses in the pipeline or hoseline.
-As used on pump suction gauges, the negative or
positive pressure at the pump suction inlet.
I t w i l l
be negative pressure if the inlet liquid is exposed to
the atmosphere below the suction inlet (such as a
source pump taking water from a well, stream, or
l a k e ) .
It will be a positive pressure if the inlet
liquid is from an elevated source (such as a storage
tank) or an upline pump.
Total Discharge Head
-The sum of the suction pressure and the discharge
pressure expressed in feet.
GLOSSARY-2
TM 10-4320-344-24
