WATER DISTRIBUTION LEVEL 3 QUESTIONS AND CORRECT VERIFIED ANSWERS

WATER DISTRIBUTION LEVEL 3
QUESTIONS AND CORRECT VERIFIED
ANSWERS
AA2factorA2orA2valueA2usedA2toA2indicateA2theA2smoothnessA2ofA2theA2interiorA2ofA2aA2pipeA2
-A2Ans--Cfactor

MajorA2partsA2ofA2waterA2distributionA2-A2Ans--
Pipes,A2storageA2facilities,A2pumpingA2stations,A2valvesA2,fireA2hydrants,A2meters,A2andA2o
therA2appurtenances

MainA2purposeA2ofA2waterA2storageA2facilitiesA2-A2Ans--
ToA2provideA2sufficientA2amountA2ofA2waterA2toA2averageA2orA2equalizeA2theA2dailyA2dema
ndsA2onA2theA2waterA2supplyA2system

TypesA2ofA2storageA2facilitiesA2-A2Ans--
ClearA2wells,A2elevatedA2tanks,standpipes,groundA2levelA2storageA2tanksA2,A2hydroA2pneu
maticA2orA2pressureA2tanks,A2andA2surgeA2tanks

20A2psiA2-A2Ans--AbsoluteA2minimumA2pressure

35A2psiA2-A2Ans--MinimumA2workingA2pressure

BasicA2requirementsA2ofA2pipesA2-A2Ans--
AdequateA2strength,A2durability,maximumA2corrosion,A2resistanceA2andA2noA2adverseA2eff
ectA2onA2waterA2quality

FourA2classesA2ofA2workingA2pressureA2areA2commonlyA2encounteredA2-A2Ans--
100,150,200,250A2psi

PushA2onA2andA2mechanicalA2jointsA2areA2mostA2oftenA2usedA2forA2-A2Ans--
DuctileA2ironA2pipe.A2Flanges,A2restrained,A2flexible,A2andA2sleeveA2jointsA2areA2alsoA2use
d

FlangeA2jointsA2-A2Ans--NotA2flexible

RestrainedA2jointsA2-A2Ans--PreventA2movement

FlexibleA2jointsA2-A2Ans--PermitsA2oneA2jointA2toA2move

PEA2pipeA2-A2Ans--HasA2theA2highestA2cfactorsA2150

PipeA2protectionA2-A2Ans--Paint

, RockA2mustA2beA2excavatedA2-A2Ans--6inches

LadderA2mustA2bA2locatedA2-A2Ans--25A2ftA2andA23ftA2aboveA2hole

LayingA2pipeA2isA2alsoA2calledA2-A2Ans--Stringing

TheA2horizontalA2shoringA2membersA2areA2generallyA2referredA2toA2asA2-A2Ans--
StringersA2orA2walers

ShieldA2shoringA2-A2Ans--
ConsistsA2ofA2aA2rectangularA2boxA2thatA2mustA2bA2openA2onA2theA2topA2andA2bottomA2and
A2usuallyA2theA2endsA2areA2openA2too


SolidA2sheetingA2-A2Ans--
UsedA2whenA2materialsA2willA2notA2standA2inA2aA2verticalA2positionA2orA2notA2practicalA2toA2
slopeA2theA2trench

TypesA2ofA2valvesA2-A2Ans--Plug,A2rotary,butterfly,A2diaphragm,A2gate

EntrainedA2-A2Ans--AirA2toA2escapeA2aA2lineA2isA2operatingA2underA2pressure

4A2partsA2toA2aA2hydrantA2-A2Ans--
InletA2pipeA2connectionA2fromA2theA2waterA2supplyA2main,theA2mainA2valve,theA2barrel,the
A2head


PostA2hydrantsA2-A2Ans--ExtendA2aboveA2groundA2mostA2commonlyA2used

RuleA2ofA2thumbA2-A2Ans--MeterA2shouldA2bA2oneA2sizeA2smallerA2thatA2serviceA2line

3basicA2backflowA2devicesA2-A2Ans--
DoubleA2checkA2valve,A2reducedA2pressure(rp),airA2gap-providesA2greatestA2protection

TheA2sourceA2ofA2supplyA2mightA2bA2aA2-A2Ans--Well

PreventiveA2-A2Ans--Scheduled

CorrectiveA2-A2Ans--EquipmentA2failure

PredictiveA2-A2Ans--MaintenanceA2program

BacteriologicalA2samplesA2areA2analyzedA2forA2theA2presenceA2ofA2-A2Ans--
TotalA2coliform.A2PresenceA2ofA2theseA2bacteriaA2indicatesA2otherA2formsA2mayA2bA2prese
nt

MinimumA2chlorineA2residualA2-A2Ans--FreeA20.2mg/lA2CombinedA20.6mg/l