tank sizing for csv

2/2/2015 Cycle Stop Valves, Inc. http://cyclestopvalves.com/tanksizing_12.html 1/3 Home Products Videos CSV Forum FAQ Order Online Search Site References CSV Applications Product Catalog Print Literature Well and Pump Basic Info VFD Does Not Save Energy CSV vs VFD CSV Tech. Info WQA Certified Calculators Tank Sizing Pump & Motor Manufacturers Letters to Editor Retrofits Pressure Switch Event Calendar Warranty Info About Us Back Sizing a Pressure Tank with a CSV Old Pressure Tank Sizing Method: In the past, pressure tanks were sized to store at least 1 or 2 gallons of water for every gallon per minute the pump can produce. A 10 GPM pump needed a pressure tank that holds 10 or 20 gallons. A 20 GPM pump needs a tank with 20 to 40 gallons of storage. Almost 2/3s or more of a tanks volume is filled with compressed air, it takes a very large tank to hold 10 to 40 gallons of water. The higher the pressure switch setting, the less water volume a tank can store. The following charts show the drawdown of tanks from 2 to 119 gallon actual size, with 40/60 compared to 60/80 pressure switch settings. A pressure tank supplies water as the pressure drops from 60 to 40 PSI. At 40 PSI the pressure switch starts the pump, the pump fills the pressure tank to 60 PSI, and the pressure switch shuts off the pump. This is called a cycle. Cycling the pump on and off causes almost

Upload: jeric-salomon

Post on 02-Oct-2015

14 views

Category:

Documents

2 download

Report

Download

Embed Size (px):

DESCRIPTION

water system

TRANSCRIPT

2/2/2015 CycleStopValves,Inc.

http://cyclestopvalves.com/tanksizing_12.html 1/3

Home Products Videos CSVForum FAQ OrderOnline SearchSite

References

CSVApplications

ProductCatalog

PrintLiterature

WellandPumpBasicInfo

VFDDoesNotSaveEnergy

CSVvsVFD

CSVTech.Info

WQACertified

Calculators

TankSizing

Pump&MotorManufacturers

LetterstoEditor

Retrofits

PressureSwitch

EventCalendar

WarrantyInfo

AboutUs

Back

SizingaPressureTankwithaCSV

OldPressureTankSizingMethod:Inthepast,pressuretanksweresizedtostoreatleast1or2gallonsofwaterforeverygallonperminutethepumpcanproduce.A10GPMpumpneededapressuretankthatholds10or20gallons.A20GPMpumpneedsatankwith20to40gallonsofstorage.

Almost2/3sormoreofatanksvolumeisfilledwithcompressedair,ittakesaverylargetanktohold10to40gallonsofwater.Thehigherthepressureswitchsetting,thelesswatervolumeatankcanstore.

Thefollowingchartsshowthedrawdownoftanksfrom2to119gallonactualsize,with40/60comparedto60/80pressureswitchsettings.

Apressuretanksupplieswaterasthepressuredropsfrom60to40PSI.At40PSIthepressureswitchstartsthepump,thepumpfillsthepressuretankto60PSI,andthepressureswitchshutsoffthepump.Thisiscalledacycle.Cyclingthepumponandoffcausesalmost
2/2/2015 CycleStopValves,Inc.

http://cyclestopvalves.com/tanksizing_12.html 2/3

everyproblemwithpumpsystems.

Themaximumnumberofcyclesallowedfora1HPpumptosurviveis100timesperday.TheaveragepersonintheUSuses75gallonsperday.Justoneortwopeopleinthehousecanuseenoughwatertocyclethepumpmanytimesperday.Addasprinkler,anopenloopheatpump,orjustafewkids,andthatcaneasilycausemorethan100cyclesperday.Largerpressuretanksreducethenumberofcycles,buttheydon?tstopcycling.

Cyclingcausestheprematuredestructionofpumps,motors,pressureswitches,relays,capacitors,checkvalves,andeventhepressuretank.Cyclingcauseswaterhammerwhichpoundsonfaucets,seals,washers,appliances,pipe,andpipefittings.Cyclingthepumpcancausethehouselightstoflickerandannoyingswingsinshowerpressure.Cyclingcancausepumpwirechaffing,pumpscomingunscrewed,noise,andhighelectricbills.Evenproblemswithminimumflowfortanklesswaterheaterscanbeattributedtocycling.

ACycleStopValve(CSV),asthenameimplies,stopspumpsfromcycling.Whenwaterisbeingused,thepressuretankdrainsandthepressureswitchstartsthepump.TheCSVthenvariestheflowfromthepumptomatchtheamountbeingused.Waterflowspastthepressuretank,directlytothefaucet,ataconstant50PSI.Onlywhenallthefaucetshavebeenturnedoff,willtheCSVallow1GPMtoslowlyfillthepressuretankto60PSI,andthepressureswitchshutsoffthepump.

AlthoughaCSVwillworkwithanysizepressuretank,largerpressuretanksarenolongerneeded.WithaCSV,a4.4gallonsizetank,whichholds1gallonofwater,issufficientforanysizehouse.Largerpressuretanksaresimplyawasteofmoneyandspace.

MostsizepressuretankscanbeusedwiththeCSV.Gotothefollowinglinkonourwebsitetoenteryourspecificsysteminformationinthecalculator.

LinktoPressureTankSizingCalculator:http://www.cyclestopvalves.com/runtime_app.php
2/2/2015 CycleStopValves,Inc.

http://cyclestopvalves.com/tanksizing_12.html 3/3

CycleStopValvesisaregisteredtrademark.Allrightreservedunlesspriorauthorizationisobtained.

CycleStopValves,Inc.10221CR6900Lubbock,Texas79407SendEmail

80065202078068854445Fax:8068851994

SelectLanguage