2024 update DC Third testing exam
TheXcomponentXinXwhichXliquidXvaporXbyXabsorbingXheatXisXcalled?X-XANSWERXEvaporator
SelectXtheXbestXanswerXelectricalXgroundingXmethod?X-
XANSWERXMetalXstakeXdriveX8XfootXintoXtheXground.
AX_____XvalveXshouldXbeXusedXforXthrottlingXpurpose?X-XANSWERXGlobe
WhatXisXtheXacceptableXrangeXforXresidualXsodiumXsulfiteXinXtheXboilerXmaintain?X-XANSWERX30-70
WhatXisXtheXBTUXcontentXofXaXgallonXofX#4?X-XANSWERX146,000
WhatXdoesXaXzeoliteXwaterXsoftenerXsystemXuseXasXaXmeansXofXregeneration?X-XANSWERXBrine
WhatXareXtheX4XstepsXforXaXZeoliteXRejuvenationXwaterXsoftenerXprocess?X-XANSWERXBackXwash
XBackwash,Xbrine,Xrinse,Xservice
WhereXisXmediumXtemperatureXisXliquidXfound?X-XANSWERXCondenser
WhereXisXhighXtemperatureXvaporXfound?X-
XANSWERXAtXtheXdischargeXofXtheXcompressorXorXcondenser
WhatXstaysXareXusedXtoXsupportXtheXburnerXchamberXinXaXscotchXmarineXboiler?X-
XANSWERXDiagonalXStays
,WhatXtypeXofXsafetyXvalveXisXthis?X-XANSWERX(XFull)XCrosbyXnozzle-typeXsafetyXvalve.XPageX365XBOG
WhatXtypeXofXsafetyXvalveXisXthis?X-XANSWERX(XFull)XCrosbyXnozzle-typeXsafetyXvalve.XPageX365XBOG
WhereXdoXyouXfoundXsuperheatXreading?X-XANSWERXTakeXsuctionXlineXpressure
XCrossXreferenceXusingXaXP/TXChart
XGetXtailXcoilXTemperature
XSubtractXcrossXreferencesXtemperatureXfromXtailXcoilXtemperature
XResultXwillXbeXsuperheat
NameXtheXwireXthatXconnectsXallXcomponentXofXaXsystemXtoXaXphysicalXgroundXorXwaterXpipe?X-
XANSWERXGroundingXElectrodeXConductor
WhereXdoXgetXsub-coolingXreading?X-XANSWERXTakeXliquidXlineXpressure
XCrossXreferenceXtoXtemperatureXusingXaXP/TXChart
XGetXliquidXlineXtemperature
SubtractXactualXtemperatureXfromXcrossXreferencedXtemperature
XResultXisXsub-cooling
OnXtheXboilersXthatXhaveXbothXQuickXopeningXandXScrewXtypeXblowXdownXvalves,XtheXQuickXopening
XvalveXmustXbeXlocated?X-XANSWERXClosestXtoXtheXboilerXandXfollowedXbyXtheXscrewXtypeXvalve
HighXpressureXboilersXequippedXwithXQuickXopeningXandXScrewXtypeXvalvesXareXblownXdownXhow?X-
XANSWERXByXopeningXtheXQuickXopeningXvalveXfirstXandXclosingXitXLast.XPageX403XBOG
,ASMEXCodeXdefinesXaXslowXopeningXvalveXasXwhat?X-
XANSWERXOneXrequiringXatXleastX5XfullX360XdegreeXturnsXbetweenXfullXopenXandXcloseXposition.XPage
X374
AX300XHorsepowerXboilerXoperatingXatX100psiXhasXanXaverageXloadXofX75%XwithX80%XcondensateXret
urnXandX5%XblowXdown.XTheXtreatmentXprovidesXaXchemicalXwhichXcostsX$8.75XperXgallon,XandXwillXt
reatX600Xgallon.XFindXtheXamountXofXtheXchemicalXneededXforXtheXdayXperiod,XandXtheXcostXofXtheXc
hemicalXforXaX30XdaysXperiod?X-XANSWERXWaterXInX=XWaterXOut
MakeupX+XCondensateXReturnX=XEvaporatorX+XBlowXDown
AverageXEvaporatorXRateX=X300XxX34.5XpphXxX.75%XloadX=X7762,X50Xpph
1XMonthX+X.8(X7762.50Xpph)X=X7762.50XpphX+X0500Xm
1XMonthX+X6210XpphX=X7762.50XpphX+X.0500Xm
X-6210X-6210
1XMonthX=X1552.5XpphX+X.0500
.9500XmX=X1552.5Xpph
.9500mX.9500
1MonthX=X1,634.21Xpph
GallonsXperXMonthX=X1634.21X/X8.33XxX24XxX30X=X141,X252.24XgallonsXperXmonth
ChemicalXneededX=X141,252.24XgallonX/X600XgallonX=X235,X40Xgallon
CostXperXmonthX=X235,X40XgallonXxX8.75X=X$2,059.75
, DuringXaX24XhoursXoperationXhowXoftenXshouldXyouXcheckXtheXwaterXlevel?X-
XANSWERXOnceXperXshift
AX15XpsiXsteamXboilerXproducesX8000XpoundXofXsteamXperXhour.XThe
XMinimumXpipeXsizeXforXtheXpipeXleavingXtheXboilerXis___12__inches.X
X(DensityXisX0.037Xlbs/ft3)
XEquation:X-XANSWERXDX=X12X(C/d/hX/.7854)
XDX=X12X(8000X/X0.037/60)X=X3,603.60
XDX=X.7854X/X5000ftX=X3,927
XDX=X3.603.60X/X3,927X=X0.917647058
XDX=X0.957938963X*X12
XDX=X11.49XORX12X"pipe
TheXboilerXsteamXlineXisX350XFeetXlong.XDuringXstart-upXtheXpipeXisXheatedX
XFromX60XFXtoX350XF.XTheX350XF.XTheXpipeXwillsXexpand__7.92__inchesX
XDueXtoXtheXchangeXinXtemperature
XEquation:X-XANSWERX(TX1X-XT2)XxXLXxX.0000065
X(350X-X60)XxX350XxX.0000065
X290XxX350XxX12XxX.0000065X=X7.92
AX12"XpipeXfilledXwithXwaterXtoXaXheightXofX250XfeetXwillXhaveXaXpressureXofX
X_________atXtheXbottomXofXtheXpipe?
XEquation:
XPX=XFTX/X2.31X-XANSWERX250XfeetX/X2.31X=X108.22
TheXcomponentXinXwhichXliquidXvaporXbyXabsorbingXheatXisXcalled?X-XANSWERXEvaporator
SelectXtheXbestXanswerXelectricalXgroundingXmethod?X-
XANSWERXMetalXstakeXdriveX8XfootXintoXtheXground.
AX_____XvalveXshouldXbeXusedXforXthrottlingXpurpose?X-XANSWERXGlobe
WhatXisXtheXacceptableXrangeXforXresidualXsodiumXsulfiteXinXtheXboilerXmaintain?X-XANSWERX30-70
WhatXisXtheXBTUXcontentXofXaXgallonXofX#4?X-XANSWERX146,000
WhatXdoesXaXzeoliteXwaterXsoftenerXsystemXuseXasXaXmeansXofXregeneration?X-XANSWERXBrine
WhatXareXtheX4XstepsXforXaXZeoliteXRejuvenationXwaterXsoftenerXprocess?X-XANSWERXBackXwash
XBackwash,Xbrine,Xrinse,Xservice
WhereXisXmediumXtemperatureXisXliquidXfound?X-XANSWERXCondenser
WhereXisXhighXtemperatureXvaporXfound?X-
XANSWERXAtXtheXdischargeXofXtheXcompressorXorXcondenser
WhatXstaysXareXusedXtoXsupportXtheXburnerXchamberXinXaXscotchXmarineXboiler?X-
XANSWERXDiagonalXStays
,WhatXtypeXofXsafetyXvalveXisXthis?X-XANSWERX(XFull)XCrosbyXnozzle-typeXsafetyXvalve.XPageX365XBOG
WhatXtypeXofXsafetyXvalveXisXthis?X-XANSWERX(XFull)XCrosbyXnozzle-typeXsafetyXvalve.XPageX365XBOG
WhereXdoXyouXfoundXsuperheatXreading?X-XANSWERXTakeXsuctionXlineXpressure
XCrossXreferenceXusingXaXP/TXChart
XGetXtailXcoilXTemperature
XSubtractXcrossXreferencesXtemperatureXfromXtailXcoilXtemperature
XResultXwillXbeXsuperheat
NameXtheXwireXthatXconnectsXallXcomponentXofXaXsystemXtoXaXphysicalXgroundXorXwaterXpipe?X-
XANSWERXGroundingXElectrodeXConductor
WhereXdoXgetXsub-coolingXreading?X-XANSWERXTakeXliquidXlineXpressure
XCrossXreferenceXtoXtemperatureXusingXaXP/TXChart
XGetXliquidXlineXtemperature
SubtractXactualXtemperatureXfromXcrossXreferencedXtemperature
XResultXisXsub-cooling
OnXtheXboilersXthatXhaveXbothXQuickXopeningXandXScrewXtypeXblowXdownXvalves,XtheXQuickXopening
XvalveXmustXbeXlocated?X-XANSWERXClosestXtoXtheXboilerXandXfollowedXbyXtheXscrewXtypeXvalve
HighXpressureXboilersXequippedXwithXQuickXopeningXandXScrewXtypeXvalvesXareXblownXdownXhow?X-
XANSWERXByXopeningXtheXQuickXopeningXvalveXfirstXandXclosingXitXLast.XPageX403XBOG
,ASMEXCodeXdefinesXaXslowXopeningXvalveXasXwhat?X-
XANSWERXOneXrequiringXatXleastX5XfullX360XdegreeXturnsXbetweenXfullXopenXandXcloseXposition.XPage
X374
AX300XHorsepowerXboilerXoperatingXatX100psiXhasXanXaverageXloadXofX75%XwithX80%XcondensateXret
urnXandX5%XblowXdown.XTheXtreatmentXprovidesXaXchemicalXwhichXcostsX$8.75XperXgallon,XandXwillXt
reatX600Xgallon.XFindXtheXamountXofXtheXchemicalXneededXforXtheXdayXperiod,XandXtheXcostXofXtheXc
hemicalXforXaX30XdaysXperiod?X-XANSWERXWaterXInX=XWaterXOut
MakeupX+XCondensateXReturnX=XEvaporatorX+XBlowXDown
AverageXEvaporatorXRateX=X300XxX34.5XpphXxX.75%XloadX=X7762,X50Xpph
1XMonthX+X.8(X7762.50Xpph)X=X7762.50XpphX+X0500Xm
1XMonthX+X6210XpphX=X7762.50XpphX+X.0500Xm
X-6210X-6210
1XMonthX=X1552.5XpphX+X.0500
.9500XmX=X1552.5Xpph
.9500mX.9500
1MonthX=X1,634.21Xpph
GallonsXperXMonthX=X1634.21X/X8.33XxX24XxX30X=X141,X252.24XgallonsXperXmonth
ChemicalXneededX=X141,252.24XgallonX/X600XgallonX=X235,X40Xgallon
CostXperXmonthX=X235,X40XgallonXxX8.75X=X$2,059.75
, DuringXaX24XhoursXoperationXhowXoftenXshouldXyouXcheckXtheXwaterXlevel?X-
XANSWERXOnceXperXshift
AX15XpsiXsteamXboilerXproducesX8000XpoundXofXsteamXperXhour.XThe
XMinimumXpipeXsizeXforXtheXpipeXleavingXtheXboilerXis___12__inches.X
X(DensityXisX0.037Xlbs/ft3)
XEquation:X-XANSWERXDX=X12X(C/d/hX/.7854)
XDX=X12X(8000X/X0.037/60)X=X3,603.60
XDX=X.7854X/X5000ftX=X3,927
XDX=X3.603.60X/X3,927X=X0.917647058
XDX=X0.957938963X*X12
XDX=X11.49XORX12X"pipe
TheXboilerXsteamXlineXisX350XFeetXlong.XDuringXstart-upXtheXpipeXisXheatedX
XFromX60XFXtoX350XF.XTheX350XF.XTheXpipeXwillsXexpand__7.92__inchesX
XDueXtoXtheXchangeXinXtemperature
XEquation:X-XANSWERX(TX1X-XT2)XxXLXxX.0000065
X(350X-X60)XxX350XxX.0000065
X290XxX350XxX12XxX.0000065X=X7.92
AX12"XpipeXfilledXwithXwaterXtoXaXheightXofX250XfeetXwillXhaveXaXpressureXofX
X_________atXtheXbottomXofXtheXpipe?
XEquation:
XPX=XFTX/X2.31X-XANSWERX250XfeetX/X2.31X=X108.22
