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Residential Water System 1

CHAPTERIINTRODUCTION

Waterisavitalkeyforhumansurvival.Waterconsumptionshould,then,begiventime

topondersincehumanactivitiesdeterioratesthepurityofnaturalwatersource.Insomeruralareas, there still exist sources of potable water, however, most of the urban places andsurroundingrurallocalitiescannotbeabsolutelycertainthatwatersourcesintheirvicinityaresafeforhumanconsumption.

Withurbanizationandindustrialization,waterconsumptionisboundtoincrease.Giventhe fact thatwater is important,engineershavebeen responsible inprovidinga system thatwouldcaterpublicdemandsandothernecessitiesthatthegovernmenthasbeengivenpriority,asImaysay.

Asfaraswaterprovision isconcerned,andaspartoftherequirementsinME165,thepurposeofthisdesignistomakeananalysisandtoprovideawatersystemtoatypicalresidentialapartmentthatcanbesituatedinanyurbanorruralzones.Since,itisassumedthatthenaturalwatersourceinanurbanoreveninruralareasarenotabsolutelysafefordrinking,anadequateandsufficientwatersystemshouldbeprovidedtoprovidetheconsumersimmediateneeds.

Theapartmenttobedesignedwiththeresidentialwatersystemconsistsoftwostoreyswith threeroomseach,thus,havingsixrooms in total.Thewater tank is tobeplacedat therooftoptoutilizegravitationalforce.


CHAPTER2

CALCULATIONOFWATERDEMAND

2.1SITEOVERVIEW

Thewatersystemisdesignedfortheresidentialapartmentconsistingoftwostoreyswithatotalofsixrooms,approximatedlotareaistobe170sq.metersandeachroom,consideredasahousehold,areais56.67sq.meterseach.

Fig.2.1

2.2TYPICALHOUSEHOLDSIZE

Referring to Figure 2.2, General Santos City has the household population of 528,011, andnumber of households of 111,927. Dividing the first by the latter we will get the averagehouseholdsizeof4.72.Forthe10barangays,theaveragehouseholdsizeisproximateto5.


Source:NationalStatisticsOffice,2007CensusofPopulationFigure2.2

Therefore,atthepresentitwillbesensibletoprojectahouseholdsizeofaboutfive(5)persons.

2.3EFFECTIVEPOPULATION

Thus,theeffectivenumberofconsumerscanbeestimatedtobe,

EffectivePopulation=6roomsX5

EffectivePopulation=30residents

2.4WATERDEMANDPERPERSON

AccordingtoGeneralSantosCityWaterDistrict,20cubicmeterperhouseholdpermonthis theaveragewaterconsumptionofa fivemember family.Thiscorresponds toabout35.22gallonsperdayperperson.Nonetheless,thePumpHandbooksection9.1(WaterSupply)saidthattheconsumptionfordomesticpurposesisgenerallyintherangeof50to60gallonsperdayperperson.Ontheotherhand,WaterSupplybyA.TwortChapter1suggestsabout39.6to50.6gallonsperdayperperson.

Consequently,itisreasonabletochoose40gallonsperdayperperson.


2.5AVERAGEDAILYWATERCONSUMPTION

Fortheaveragedailywaterconsumptionoftheconsumers,QA

QA=AverageDailyWaterUseperPersonXEffectivePopulation

QA=40 X30residents

QA=1,200

2.6POPULATIONGROWTHFACTOR

Fromthepublication,WaterfortheWorld,thedesignofwatersupplysystemsshouldconsiderthelikelypopulationincreaseforcertainyearstoprovidesufficientwaterrequirementofthefutureconsumers.

The National Statistical Coordination Board figures General Santos City to have anAverage Annual Population Growth Rate of 2.38% in 2007. Moreover, the water system isintended to serve the community for about 25 years, so a population growth factor isinterpolatedfromTable3ofthesamesourcetohaveavalueof1.58.Thus,theaveragedailyhouseholdwaterconsumptionshouldconformtothis,

QB=QAX1.58

QB=1,200X1.58

QB=1,896

2.7PEAKING/LOADINGFACTORToprovideforunusualwaterdemands,manydesignengineersapplya200to250percent

load factor to the average hourly consumption that is determined from the average annualconsumption.This factorcoversvariations inwaterdemand,uncertaintiesas toactualwater


requirements,andforunusualpeakdemandswhosemagnitudecannotbeaccuratelyestimatedinadvance.

Therefore,theaveragedailyhouseholdwaterconsumptionisfurtheradjusted,QC=QBX2

QC=1,896X2

QC=3,792

Alternatively,wecandesignatethisasthetotalwaterflowinhouseholdsfortheentireapartment,sayQHOUSEHOLD,TOTAL,

QHOUSEHOLD,TOTAL=3,792gal/day

=2.633gal/min

=0.005887ft3/sec

2.8MAXIMUMDAILYDEMANDPERHOUSEHOLD,MDDHOUSEHOLD

MDDHOUSEHOLD=,.

MDDHOUSEHOLD= ,

MDDHOUSEHOLD=632


2.9CALCULATIONFORLEAKAGESAccording to American Water Works Association Research Foundation (AAWARF),

ResidentialWaterUseSummaryPublication(www.aquacraft.com),studyshowsthatamajorityofhousesareresponsibleforleakagesatanaverageof21.9gallonsperhouseholdperday.Sothatfor6housingunitsexpected,wecansaythatanAverageDailyLeakageADDLEAKAGEwillbe,

ADDLEAKAGE=6householdsX21.9

ADDLEAKAGE=131.4

WewilldesignatethisasQLEAK,QLEAK=131.4

=0.09125gal

=0.0002042.11TOTALMAXIMUMDAILYDEMAND,QMDD,TOTAL

Thetotalmaximumdailydemandoftheentirecommunityisthencalculatedtobe,

QMDD,TOTAL =QHOUSEHOLD,TOTAL+QLEAK

=3,792+131.4

QMDD,TOTAL =3,923.4

=2.725

=0.006085


CHAPTER3DESIGNOFWATERTANK

Beforewaterreachestheconsumer(afterbeingdistributedfromthetreatmentplant),it

mustbeadequatelyandsafelystored.Thewaterdistributionsystemshouldhavestoragesothatit is capable for basic domestic purposes and to accommodate the flows necessary foremergenciessuchasfirefighting.Storageshouldmeetpeakflowrequirements,equalizesystempressures,andprovideemergencywatersupply.Thewatersupplysystemmustprovideflowsofwatersufficientinquantitytomeetallpointsofdemandinthedistributionsystem.3.1WATERTANKTYPE

Anelevatedstoragetankwillbeprovidedwithinthesystemtosupplypeakdemandratesandequalizesystempressures. Ingeneral,elevatedstorage ismoreeffectiveandeconomicalthangroundstoragebecauseofthereducedpumpingrequirements,andthestoragecanalsoserve as a sourceof emergency supply since systempressure requirements can stillbemettemporarilywhenpumpsareoutofservice.

Elevatedstoragecanmaintainadequatesystempressuresand flowsduringperiodsofpeakwaterdemand.

3.2WATERTANKPROFILEWater tanks canbemadeof concreteor steeland can takevarious forms.Themost

suitableformforconcretetanksisacylinderwithaflatbottom.Weldedsteeltanksmayhaveahemisphericalordomeshapedbottom.Theshapeplannedisofcylindricalbody,aconicaltopcoveringwithasmallopeningactingasanairventandahemisphericalbottomwhichistoreducedeadstoragewateramount.Thematerialtobeusedforthetankismildsteel.


3.3WATERTANKCAPACITYThemethodofsizingthestoragetankispresentedasfollows,asacquiredfromtheU.S.

AirForceTechnicalManual5,Volume4,WaterSupply,WaterStorage,AppendixB.25PercentofTotalDailyDomesticStorageRequirements

QA=QMDD,TOTALX0.25

QA=3,923.4X1dayX0.25

QA=980.85

QA=131.4339

3.4MINIMUMTANKDIMENSIONS

Thetankthatwillbe installedwillhaveacylindricalbodywitha flattopandroundedbottom.Fromatanksupplierproductcatalogue,rangeofavailabletankheightsisaround8ft.to80ft.Amidrangeheightof10ft.isassumed.Sothatthevolumeofthecylindricalbodycanbeexpressedas,

.

Andthevolumeofthehemisphericalbottomwouldofcoursebe,

Thewaterlevelinthetankwhenfullisatthepointwherethecylindricalbodyandtheconicalcoveringmeet,therefore,thevolumeoftheconicalpartisnotincludedinthecalculation.

Hence,thetotaltankcapacityisexpressedas,


6

1.5

12

131.4339 1.5

SolvingforthediameterD,

D=4.3261ft

D=1.436m

D=1,436mm

SurfaceAreaCalculations(ForBillingofMaterials):

4.32616

81.5451

2 2

4.32612 4.3261

2 6

43.3411


22

24.32612

29.40

3.5 WATERTANKSTRESSANALYSIS

Asoneofthemostusedmaterialforawatertank,andalsosuggestedbywikipedia.org,mildsteelwillbeused.It(mildsteel)haslessthan0.15%carboncontentandisavailableinthemarket.

Material MildSteel

UnitWeight 0.282

YieldStress 27,000psi

,usualfactorofsafetyis4

27,0004 6,750

Thedesignerschose thecylindricalbody tobe . thick, for the fact that the stressestablishedbythehydrostaticforceisradial.


where =themaximumpressureinsidethetank,psi =

=tankdiameter,ft =cylindricalbodythickness,ft

62.346 144

2.5975 2

2.59754.7120.512

146.8107

Thedimensionsandmaterialofthetankarepropersincethemaximumallowablestressisgreaterthantheactualmaximumstress.Hence,thereservoirissafefromburstingpressure.

Since,thepressureorstressatthebottomofthetankispredictabletobelargerthanthatonthecylindricalbody,itisreasonabletomakethesemisphericalbottomthickerthanthebody.

Accordingly,a .metalsheetistobeused.


CHAPTER4

DESIGNOFDISTRIBUTIONMAINS

TheU.S.AirForceTechnicalManual5,Volume5,suggeststhatmainsshouldbelocatedalongstreetsinordertoprovideshorthydrantbranchesandserviceconnections.Mainsshouldnotbelocatedunderpavedorheavilytravelledareasandshouldbeseparatedfromotherutilitiestoensure thesafetyofpotablewatersupplies,and thatmaintenanceofautilitywillcauseaminimumofinterferencewithotherutilities.

4.1DISTRIBUTIONSYSTEMOUTLINE

Theconfigurationofthedistributionsystemisdeterminedprimarilybysizeandlocationofwaterdemand, streetpatterns, storage facilityand topography.Agridironpattern loopedfeedersystemispreferredthatithasthehydraulicadvantageofdeliveringwatertoanylocationinmorethanonedirection,insteadofthebranchingsystemtoavoidorminimizedeadendssincedeadendsinthedistributionsystemareundesirableandshouldbeavoidedtotheextentpossible.Theloopedsystemshouldbeusedforwaterdistributionsystemswheneverpracticable.Thewaterdistributionsystemdefinedheretowillbecomposedbasicallyof2loopfeedersandthemainpipeline.

4.2LOOPS

Thewatersystemwillbedesignedconsistingof2feederpipeline loops.Each loopwillsupply water to 3 (three) households and should also assure water flows on the hydrantinstallations.The2loopsconfiguredaredetailedasfollows:

Loop1:Thiscircuitwillsupplywatertohousingunitsinthefirststoreywithhouseholds1,2and3.


Loop 2: This circuit will supply water to housing units in the second storey withhouseholds4,5and6.

4.3REQUIREDWATERFLOWPERLOOPOFTHEDISTRIBUTIONSYSTEM

Water demand will then be determined based on the Maximum Daily Demand per

householdcalculatedpreviouslyas,MDDHOUSEHOLD=632

.

LOOP1

Numberofhousingunits: 3units

ForLoop1,requiredflowQLOOP1willbe,

QLOOP1=(MDDHOUSEHOLD+ADDLEAKAGE)X3households

QLOOP1=(632

+21.9

)X3households

QLOOP1=1,961.7

QLOOP1=1.363

QLOOP1=0.00304

LOOP2

Numberofhousingunits: 3units

ForLoop2,requiredflowQLOOP2willbe,

QLOOP2=(MDDHOUSEHOLD+ADDLEAKAGE)X3households


QLOOP2=(632

+21.9

)X3households

QLOOP2=1,961.7

QLOOP2=1.363

QLOOP2=0.00304

4.4REQUIREDWATERFLOWONTHEMAINFEEDERPIPELINE

Soduringdaysofnormalusagewhichimpliesdaysofaveragewateruseondomesticpurposesexclusiveofemergencyandfiredemandsthetotalflowiscalculatedontheelevenloopsplusthedailydemandonthechurch,sayingittheotherwayastheflowrequiredonthemainpipelines,QMAINPIPELINEwouldbe,

QMAINPIPELINE=QLOOP1+QLOOP2

QMAINPIPELINE=1.363+1.363

QMAINPIPELINE=2.726

4.5DISTRIBUTIONSYSTEMPIPELINESUMMARYANDPIPESIZING

As determined previously,wewill assume flowsQMAIN PIPELINE,QLOOP andQLOOP 2 to beuniformonthemainpipelines,loops1and2respectively.

4.6PIPELINEMATERIAL

Commercially available galvanized iron (GI) pipes will be used in the system. Thepropertiesofgalvanizedironfavouringitsusearelightweight,highstrength,andabilitytoyieldordeflectunderloads,andthecapabilityofbendingwithoutbreaking.


4.7PIPEDIAMETERS

FromtheHandbookofMechanicalEngineeringCalculations,Section14.12,WatersupplyandStormwaterSystemDesign,mentionsthatatypicalallowablefrictionheadlossforwatersupplysystemsis10ftofwaterper1000ft(3.0mper304.8m).Sowefirstassumethatafrictionheadlossof10ftofwaterper1000ftofpipeissuitableforthissystem.

Consequently, we then assume that the pipe is sized by using the HazenWilliamsequationwiththecoefficientC=100.MostwatersupplysystemsaredesignedwiththisequationandthisvalueofC.

From the same text, Fig. 10 shows a nomogram for solution of the HazenWilliamsequation for pipes flowing full. With the assumed frictionhead loss of 10 ft /1000 ft (3.0m/304.8m)ofpipeontherighthandscale,thenprojectingthroughtheassumedHazenWilliamscoefficientC=100,andextendingthisstraightlineuntilitintersectsthepivotaxis.Thenonthelefthandscale,theknownflowratesofthemainpipelinesandthethreeloopsareprojectedtothepreviouslyfound intersectiononthepivotaxis.Notably,whentherequiredpipesizefallsbetweentwoplottedsizes,thenextlargersizeisused.

Therefore,thesuggestedinsidediameterforthemainfeederlineis5inches,and1inchforthedistributionlines.However,fromthepublicationRuralWaterSupply,Volume1,DesignManual,theavailable insidediameterforGIpipes inthe locale isupto75mm(2.95 in)only.Therefore,themainfeederlinewillusethegreatestdiameterofGIpipesavailablethatis75mm.Forthedistributionlines,25mm(0.98in)willbeused.

PIPELINE FLOWRATE

QSUGGESTEDPIPESIZE(InsideDiameter)

MAINFEEDERLINE 2.726 75mm(2.95in)

LOOP1 1.363 25mm(0.98in)

LOOP2 1.363 25mm(0.98in)


4.8MAINFEEDERPIPELINESUMMARY

The linesbasicallystartfromtheelevatedstoragetank locationuntileachdistributionpipelineloop.PipesthroughsegmentsASRCBAaresetwithequalpipesizes.FromRuralWaterSupply,Volume1,DesignManual,thelargestnominaldiameterforGIpipeswhichis75mmwillbeused.Coefficientoffriction,ksvaluesforvalvesandfittingsarefromTwortsWaterSupply,Table12.2.

Therefore,themainpipelineistobeconstructedwithalengthof10ft.or3.1m.

VALVESANDFITTINGSONMAINFEEDERLINE:

Valve/FittingType

CoefficientofFriction,

ks

No.ofoccurrence/s

75mm90Elbow 1.5 275mmTee 0.4 4

4.9DISTRIBUTIONPIPELINESUMMARY

FromRuralWaterSupply,Volume1,DesignManual,thelargestnominaldiameterforGIpipeswhichis25mmwillbeused.

LOOP1PIPELINESUMMARY

Loop1willbecomposedofpipesegmentAB.

STRAIGHTPIPESONLOOP1:

GalvanizedIronPipes25mm(0.98in.)InsideDiameter

PipeSegment PipeLengthAB 13.8m(45ft)

TOTALLENGTH 13.8m(45ft)


VALVESANDFITTINGSONLOOP1:

Valve/FittingType


ks

No.ofoccurrence/s

25mmGateValve 0.25 3

LOOP2PIPELINESUMMARY

Loop2willbecomposedofpipesegmentCD.

STRAIGHTPIPESONLOOP2:

GalvanizedIronPipes25mm(0.98in.)InsideDiameter

PipeSegment PipeLengthCD 13.8m(45ft)

TOTALLENGTH 13.8m(45ft)

VALVESANDFITTINGSONLOOP2:

Valve/FittingType


ks

No.ofoccurrence/s

25mmGateValve 0.25 3


CHAPTER5

CALCULATIONOFLINEFRICTIONHEADLOSSES

5.1FRICTIONHEADLOSSES

Forthecalculationoftheelevationofthetank,theprimeheadlossinthepipelineiswellthoughtouttoensurethatallelementswillbeprovidedappropriately.

FromTwortsTable12.2,thevaluesofaconstantksinsolvingtheheadlossinfittingsandvalvescanbeused.Theformulafortheheadlossinthevalvesandfittingsis,

Fortheheadlossinthepipes,HazenWilliamsequationwillbeused.

. . .

Incalculatingheadlosses,thefarthestpointfromthetankwillbeconsideredsinceithasthegreatestheadloss,whichispointD.Nonetheless,thereisonlyonepathtothatpoint,thepathAB,thus,theheadlosswillbedirectlycalculatedforthispath.

5.2FRICTIONHEADLOSSCALCULATIONFORPATHCD

Incalculatinghead losses forvalvesand fittingsalong thepath,watervelocity is firstcalculated.Thecontinuityequationisused,andQisfromChapter4(QMAINPIPELINE),whichis2.726or0.00609

.Thediameterofthepipeis75mm(2.95in.).


0.00609

4

0.00609

2.95 12 4

.

Thiswatervelocity isacceptablesinceaccordingtoUSTechnicalManual,watervelocityVinthecircuitneednotgobeyond10fps.

Since,Visalreadycalculated,thecoefficientoffrictionvalues(ks)willbetabulatedbelowandsummed.

Valve/FittingType


ks

No.ofoccurrence/s Total

75mm90Elbow 1.5 2 375mmTee 0.4 4 1.6TOTAL 4.6

Now,forfrictionheadlossesforvalvesandfittingsalongpathASR,

2

4.60.1283

232.17

.

IncalculationofheadlossesforpipesalongpathCD,itstotallengthwillbe45ftor13.8m.


Now,forthefrictionheadlossesforpipes,

0.42262 . .

0.42262 45 0.1283100 . 2.9512

.

.

Thus,thetotalfrictionheadlossforpathCDis,

0.00117 0.000923

.


CHAPTER6

CALCULATIONOFWATERTANKELEVATION

ThetankelevationcanbecalculatedusingtheBernoullistheorem.

where =pressureonthewaterlevelinthetank,0psig

=watervelocityinthetank,0fpsforlargetanks

=tankelevation,feet

=desiredexitpressureofwaterinfaucets,etc,25psig

=desiredexitvelocityofwaterinfaucets,etc,7fps

=totalheadlossinthecircuit,0.00294ft

0

02

25 14462.34

72 32.17 0.00294

.


CHAPTER7

SELECTIONOFPUMP

In this chapter the selection of pump is discussed. The type of pump selected is asubmersibletypesincethepumpingwaterleveliscloseto20m(65.62ft)(RuralWaterSupply,Volume1,DesignManual).

7.1SUBMERSIBLEPUMP

Thesubmersiblepumpisapumpwhichhasahermeticallysealedmotorclosecoupledtothepumpbody.Thewholeassemblyissubmergedinthefluidtobepumped.Theadvantageofthistypeofpumpisthatitcanprovideasignificantliftingforceasitdoesnotrelyonexternalairpressure to lift the fluid. The pump is installed just above the motor, and both of thesecomponentsaresuspendedinwater.Submersiblepumpsuseenclosedimpellersandareeasytoinstallandmaintain.Thesepumpsrunonlyonelectricpowerandcanbeusedforpumpingwaterfromverydeepandcrookedwells.Moreover, theyareunlikely tobestruckby lightningandrequireconstantflowofwateracrossthemotor(RuralWaterSupply,Volume1,DesignManual).

Submersiblepumpsshouldstrictlybetermedsubmersiblemotorpumpsorsubmersiblepumpsets.Thepump,drivenbya submersiblemotor, isvery similar toapumpdrivenbyavertical spindle drymotor,although somedifferencesaregivenbelow. Submersiblepumpsgained inpopularitybecause theyusually result ina cheaper installation thanoneusingdrymotors.Thedisadvantagesofhavingasubmergedmotor(outofthesightandhearingofanyattendantandlessreliablethanadrymotorwhenthesubmersiblemachinewasfirstintroduced)havebeenlargelyovercomebyimprovementsinthemotordesign,particularlyintheinsulationandintheinstrumentationusedformonitoringpumpperformance.Properlychosensubmersiblepumpshaveprovedreliableinserviceovermanyyears;submersibledesignsarenowavailablefromspecialistmanufacturersforaverywiderangeofduties(TwortsWaterSupply).


7.2CALCULATIONOFTOTALDYNAMICHEAD

Inselectingpumps, totaldynamicheadmustbecalculated firstas itdetermineswhatpumpisneededinthesystem.

Insolvingforthetotaldynamichead,thetotalstaticheadmustfirstbeconsidered.Theformulafortotalstaticheadis

where =totalstatichead,feet =totalsuctionlift,feet =watertankelevationrelativetothedesigncircuit,58.51ft. =headoftheweightofthewater(tankheight),6feet

Atotalsuctionpipelengthof200ft.willbeused,

200 Therefore,

200 58.51 6 .

Incalculatingtotaldynamichead,thevelocityofwaterflowmustbesolved.Thediameterofpipesusedforsuctionanddischargeare50mm(1.969in.)GIpipes. Thetotalmaximumdaydemandis0.00209,thus,thewatervelocitywillbe, ,

0.00609

4

1.96912


.

Incalculatingthetotaldynamichead,theheadlossofthepipecircuitfromthepumptothewaterstoragetankmustbemeasured.Thetotallengthofthepipestobeusedis265ft.ThevalvesandfittingstabulatedbelowisbasedonRuralWaterSupply,Volume1,DesignManual,Table11.3.

Valve/FittingTypeEquivalentLengthperValve/Fitting

(m)

No.ofoccurrence/s

Total

50mmStrainer 6.10 1 6.1050mm90Elbow 1.62 3 4.8650mmCheckValve 4.27 1 4.2750mmGlobeValve 16.76 2 33.5250mmFootValve 2.74 1 2.74

TOTAL 51.49Sincethevalvesandfittingshaveequivalentlengths,thiswillbeaddedtothetotallength

ofpipes,thus, 265 51.49 316.49ft

Therefore,thetotalfrictionheadlossalongpipesandvalvesinthecircuitisgivenby,

0.42262 316.49 0.1283100 . 1.96912

.

.


Therefore,thetotaldynamichead,is,

264.51 0.0129 .

FromthebookPumpsandBlowersbyChurch,theformulaforthefluidhorsepoweris,

where =fluidhorsepower,hp

=deliveredweight, =, 62.34

=totaldynamicheadordischargehead,feet , 0.326 62.34 .

20.33 264.523550 .


FromthebookPumpsandBlowersbyChurch,theformulaforthebrakehorsepoweris

where =brakehorsepower,hp =fluidhorsepower,hp

=overallpumpefficiency

Thetypicaloverallpumpefficiencyrangesfrom60%to80%.Accordingly,inthisdesign

70%willbeused.Thatis, 9.780.70

.

ThediagramshownaboveisfromtheSubmersiblePumpsBrochureofGrundfosA/S.Withthecalculatedtotaldynamichead264.523ft.(80.63m)andthetotalpumpvolumedischargecapacity1,173.36 (33.23

),the intersection lies insidethegraph.Thatpoint iswithinthe

regionofSP30pump.


CHAPTER8

MISCELLANEOUSACCESSORIES

Inthewatersystemdesign,therearevariousequipmentusedthatareessentialtothesafety of the main equipment such as the pump and other piping. In this chapter, theseaccessoriesareenumeratedandgivenbriefdescription.

8.1 CU3

TheCU3controlunitelectronicmotorstarterformonitoringandprotectinginstallationswithratedvoltagesof200575V,5060Hz,andamaximumpowerconsumptionof400A.

TheCU3monitorsthefollowing;

Systeminsulationresistancetoearthbeforestart

MotorTemperature

Motorcurrentconsumptionandcurrentunbalance

VoltageSupply

Phasesequence

TechnicalData

EnclosureClass:IP20

AmbientTemp.:20to+60

RelativeHumidity:99%

VoltageVariation:25/+25%ofnominalvoltage

Frequency:45to65Hz


MaximumbackupFuse:10A

RelayOutput:Max.415V,3A,AC1

Approvals:theCU3complieswith:VDE,DEMKO,EN,ULandCSA.

Marking:CE

8.2 R100REMOTECONTROL

WirelessinfraredremotecontrolbymeansoftheR100.Thisfunctionenablestheusertochangefactorysettingsandtomonitortheinstallationbycallingupactualoperatingdata,e.g.currentconsumption,supplyvoltageandoperatinghours.

8.3 EXTERNALSENSORSSM100

ReceptionOf data from External sensors bymeans of an SM100 sensormodule andcontrolaccordingtodatareceived,e.g.flowrate,pressure,waterlevelandconductivity.

8.4 MTP75MOTORPROTECTION

TheMTP75protectsagainsttoohighmotortemperature.This isthecheapestwayofensuringlongmotorlife.Thecostumeriscertainthatoperatingconditionsareobservedandisgivenindicationofthetimewhenaservicecheckistobemade.

TechnicalData

SupplyVoltage:2variants:

1x200400V10%,50/60Hz

3x380415V10%,50/60Hz


Atransformerisrequiredforvoltagesover415volts

ControlVoltage:contactload:

Maximum415V/3A

Minimum12V/20mA

Enclosure:IP20

OperatingConditions:

MinimumTemperature20degreeCelsius

Maximumtemperature+60degreeCelsius

RelativeHumidity:99%

Storage: MinimumTemperature20degreeCelsius

Maximumtemperature+60degreeCelsius

8.5 WATERTREATMENT

Mostcommontypeofwaterqualityproblemsofgroundwatersourcesistheexcessiveamountofironandmanganeseofrawwater.AccordingtoTable10.1TreatmentOptionsorRWSDesignManual,AerationMethod issuitedtogroundwatercontaminatedof Iron,manganeseandHydrogensulfide.Thediffusersortheuseandemployingbafflesinthetanktolengthenthetravelofwater.Thiswouldmakethewaterbemoreexposedtoair,andbyreactionremovingironfromit.

Also,strainerisinstalledinpumpingwaterlevelthuspreventingwatercontamination.


8.6 CONTROLS

Thisinvolvesvalves/fittingsforcontroloftransmissionanddistributionmains.

Valves/Fittings Uses TypeIsolationValve Canbemanuallyclosedto

blocktheflowofwater;primarypurposeofthesevalvesistoprovidemeansofturningoffaportionofthesystemandemployedthroughoutthenetwork

GateValves

DirectionalValve

(CheckValve)

Usedtoensurethatwatercanflowonlyinthedirectionthroughapipeline;installedinthepipelinethroughthetank

CheckValve

Fittings Tocorrectthesametypeandsizeofpipe

Union;Couplings

Reducers Toconnecttwopipesofdifferentsize

TeeReducers

Caps,plugs,andblindflanges

Tostoptheflow


Chapter 9

BILLINGOFMATERIALS

Inthischapter,thematerialsandequipmentusedaretabulated,withtheirunitpricesandrespectivequantities.

Description Unit Price (Php) Quantity Total

10 75mm GI pipe 1,250 1 1,250

45 25mm GI pipe 3,375 2 6,750

75mm GI Tee 500 1 500

75mm x 25mm GI Tee (reducer)

400 1 400

75mm 90 Elbow 300 1 300 25mm Gate Valve 400 6 2,400

Grundfos SP 30 Pump

200,000 1 200,000

Miscellaneous Accessories

25,000

TOTAL 236,600


Chapter 10

FIGURES

SelectedApartmentforDesigningWaterSystem

TheApartmentInstalledwithWaterSystem


Left:ThetankwithaD=4.326ft.andH=10ftRight:WaterReceiverforOverflowPipe(Red)andMaintenancePipe(Green)

Blue:DischargePipe(ToConsumers);Yellow:SuctionPipe(FromWaterSource)


PipelinestoEachApartmentRoom

TheWaterPump:SP30Pump


References

PublishedMaterials:

PumpHandbook,ThirdEditionbyIgorKarassik Mark'sStandardHandbookForMechanicalEngineersbyAvalloneandBaumeister WaterfortheWorldPublication HandbookofMechanicalEngineeringCalculations

o WaterSupplyandStormwaterSystemDesigno Handbook ofMechanical Engineering Calculations: Plumbing andDrainage for

BuildingsandOtherStructures ThePracticalPumpingHandbookbyBrianNesbitt

InternetPublications:

Article 302 Submersible Pump Sizing Large Wells by California GroundwaterAssociation(www.groundh2o.org)

TechBrief:Reservoirs,Towers,andTanks DrinkingWater Storage FacilitiesbyVipinBhardwaj(www.ndwc.wvu.edu)

Goulds Pumps Product Catalog Submersible Turbine Pumps by Goulds PumpsCorporation(www.goulds.com)

SubmersibleWellPumpsforDrinkingWaterWells(www.inspectny.com/water) FloridaAdministrativeCode:FinishedDrinkingWaterStorageCapacity ProjectWaterSupply:WaterDemandsAppendixA(www.maderacounty.com) ArmyEngineeringPublications:TechnicalManuals(www.usace.army.mil)

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