▁to ▁upper ▁flo ors ▁of ▁high ▁rise ▁buildings . ▁The ▁need ▁for ▁a ▁water ▁pressure ▁boost er ▁p ump ▁can ▁also ▁arise ▁after ▁the ▁installation ▁of ▁a ▁back flow ▁prevent ion ▁device ▁( B FP ), ▁which ▁is ▁currently ▁mand ated ▁in ▁many ▁municipal ities ▁to ▁protect ▁the ▁public ▁water ▁supplies ▁from ▁cont amin ants ▁within ▁a ▁building ▁entering ▁the ▁public ▁water ▁supply . ▁The ▁use ▁of ▁B FP s ▁began ▁after ▁The ▁C lean ▁Water ▁Act ▁was ▁passed . ▁These ▁devices ▁can ▁cause ▁a ▁loss ▁of ▁ 1 2 ▁P SI , ▁and ▁can ▁cause ▁flush om eters ▁on ▁upper ▁flo ors ▁not ▁to ▁work ▁properly . ▁After ▁pip es ▁have ▁been ▁in ▁service ▁for ▁an ▁extended ▁period , ▁scale ▁can ▁build ▁up ▁on ▁the ▁inside ▁surfaces ▁which ▁will ▁cause ▁a ▁pressure ▁drop ▁when ▁the ▁water ▁flows . ▁ ▁Const ruction ▁and ▁function ▁ ▁Bo oster ▁p umps ▁are ▁usually ▁p ist on ▁or ▁pl ung er ▁type ▁compress ors . ▁A ▁single - act ing , ▁single - stage ▁boost er ▁is ▁the ▁simplest ▁configuration , ▁and ▁compr ises ▁a ▁cyl inder , ▁designed ▁to ▁with stand ▁the ▁operating ▁press ures , ▁with ▁a ▁p ist on ▁which ▁is ▁driven ▁back ▁and ▁forth ▁inside ▁the ▁cyl inder . ▁The ▁cyl inder ▁head ▁is ▁fitted ▁with ▁supply ▁and ▁dis charge ▁ports , ▁to ▁which ▁the ▁supply ▁and ▁dis charge ▁h oses ▁or ▁pip es ▁are ▁connected , ▁with ▁a ▁non - return ▁val ve ▁on ▁each , ▁const ra ining ▁flow ▁in