SECTION II. DEFINITION OF UNUSUAL TERMSUNUSUALTERMS.This section provides definitions for terms used in this manual which are notdefined in the United States Army Dictionary (AR 310-25).The term appears on theleft of the hyphen, "-".The definition for the term appears immediately to theright of the hyphen, "-".TERMDEFINITIONSSuction PressureHead-The pressure against which a pump forces liquid,expressed in feet.Each pound of pressure per squareinch against which the liquid is forced is equivalentto lifting a column of water 1 inch high square 2.31feet high.The head includes the height to which theliquid must be raised plus the force required toovercome friction losses in the pipeline or hoseline.-As used on pump suction gauges, the negative orpositive pressure at the pump suction inlet.I t w i l lbe negative pressure if the inlet liquid is exposed tothe atmosphere below the suction inlet (such as asource pump taking water from a well, stream, orl a k e ) .It will be a positive pressure if the inletliquid is from an elevated source (such as a storagetank) or an upline pump.Total Discharge Head-The sum of the suction pressure and the dischargepressure expressed in feet.GLOSSARY-2TM 10-4320-344-24
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