Page 104 - Water Standards

eratorstatorisofinte g ralstructure , thes p acin gofunitsshall
meetthelen g thre q uirementforp ullin gouttheshaft.
3 Thesettin gelevationofunitshallbethesumofmaxi-
mumdesi g ntailwaterlevel , dischar g ehei g ht( thatisthediffer-
encebetweenthelowered g eofrunnerandthemaximumwater
levelintailracetrou g h)and1 / 2oftherunnerdiameter.
4 Thewidthofp owerhouseshallbedeterminedaccordin g
tounitdimensions ,s p hericalvalveanditscontrolmechanism,
s p eedcontrole q ui pmentandelectrice q ui pment , safet yp assa g e ,
andthicknessofwallsandcolumnsincombinationwiththecrane
hooktravellimits.
8.2.3 Thela y outofp owerhouseswithverticalPeltonturbine
unitsshallcomp l ywiththefollowin gp rinci p les :
1 Thes p acin gofunitsshallbedeterminedbasedonthedi-
mensionofrin gdistributorp i p e, thicknessofconcreteencase-
mentforthedistributorandaccessre q uirementaswellasthe
la y outofg eneratorandelectricale q ui pment.
2 Thesettin gelevationshallbedeterminedb ythesumof
maximumdesi g ntailwaterlevel , dischar g ehei g htand1 / 2ofthe
bucketwidth.
8.2.4 Thedesi g nofthetailracetrou g hofPeltonturbinesshall
meetthefollowin g s :
1 Enou g hventilationclearanceshallbeensuredintherun-
nerbucketsundervariousp ossibleo p eratin gconditionshave.
2 Thesur g elevelintailracetrou g hshallnotexceedthe
lowered g eofrunnerwhenwaterj etsuddenl ydeflects.
3 Thetailracetrou g hshallserveasastillin gbasin, ande-
rosionresistancedesi g nshallbeconductedforitssidewalland
bottomslab.
8.2.5 Thehi g hp ressurevalveforp enstockshouldbearran g ed

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