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WaterSupplyDuringPowerOutages
Abladderpressuretanksetatnormalpressuresettingsisnotareliablewaytostorewaterforpoweroutages.Murphyslawsaysthatwhenthepowergoesoff,yourpressurewouldbeat41PSI,whenusinga40/60switch.Thismeansthatyoutankonlyhasafewcupsofwaterstored.Thereisnowaytomakecertainthatthetankispumpedupto60beforethepowergoesoff.Youwouldjustbeluckyifthetankhadanywherenear10gallonsofwaterinitwhenthepowergoesoff.AndMurphyliveswithallofussothisisprobablynotgoingtohappen.
Decreasingtheairprechargeinthetanktosay20PSI,istheonlywaytobesurethereisanywaterinthetankduringapoweroutage.Thiswayevenifthepressurewas41whenthepowerwentoff,youwouldstillhaveafewgallonsexpressedfromthetankasthepressuredropsfrom41to20PSI.Decreasingtheairchargefromthe38PSIrecommendedfora40/60switchto20PSI,meansthe10gallondrawdownwillonlybeabout7gallonsbetween60and40PSI.Butyouwouldhave3or4gallonsleftasthepressuredropsfrom41to20PSI.Reducingtheairchargealsocausesthebladdertooverstretchandshortensthelifeofthetank.OfcoursetheCSVeliminatessomanycyclesthatthebladdershouldstilllastalongtime.
Sotheconclusionisthatthiswillworkifyouuselessairpressureinthetank.However,thebestwaytohavewaterduringapoweroutage,istospendthemoneyonageneratorinsteadofalargertank.Thiswillgiveyouwaterforlongerperiodsofpoweroutagesuchaswhenthelinesaredownfordaysatatime.10gallonsinatankwouldonlylastafewminutes.Withagenerator,youhavewateraslongasyouhavefuel.
Whenusingalargerpressuretank,youdontwanttheCSVtotaketolongtorefillthetank
afterthefaucetsareclosed.ACSV1Wcomespresetat50PSI.Sobelow50PSIitwillletthetankfillatthefullpumprate.Above50PSI,theCSVwillonlyallow1GPMtofillthetank.Sowithatankthathas10gallonsofdrawdownwitha40/60switch,theCSVsetat50PSIwouldtakeabout5minutestorefillthetank.Wereallydontwantittotakelongerthanabout3minutestorefillthetank.Soyouwouldneedtobackthepressureswitchdownto35/55,orsettheCSVupto55PSI.Thiswayweareonlytoppingoffthelast25%ofthetankat1GPM.
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