G - PIPING
1--Hot Water:
a.The recommendedpipinghook-upis shownin Figure17.Also referto PeerlessWaterSurvey.
2--Steam:
a.The recommendedpipinghook-upis shownin Figure16.Pleasenotethat a Hartfordreturnloopis recommendedtobe usedonall steam
boilers.Also referto PeerlessSteamSurvey.
3--The reliefvalveand popsafetyvalveshallbe installedby usingthe 3/4"x 3"nippleand 3/4"elbowsuppliedwith theboiler.Referto illustrations
locatedinSectionR- "Ratings,Tappingsand DimensionalData".LargeNPTsizevalvesmaybe installedin supplypiping.
NOTE: IFTHIS BOILERANDDISTRIBUTIONSYSTEMIS USEDINCONJUNCTIONWITHA REFRIGERATIONSYSTEM.THECHILLED
MEDIUMSHALLBE PIPEDIN PARALLELWITHTHEBOILERANDTHEPROPERVALVEAPPLIEDTO PREVENTTHECHILLED
MEDIUMFROMENTERINGTHE BOILER.A DRAWINGILLUSTRATINGTHIS HOOK-UPIS PROWDEDINFIGURE18.
WHENTHEBOILERIS CONNECTEDTOHEATINGCOILSLOCATEDINAIR HANDLINGUNITWHERETHEYMAYBE EXPOSED
TO REFRIGERATEDAIR CIRCULATION,THE BOILERPIPINGSYSTEMMUSTBE EQUIPPEDWITHFLOWCONTROLVALVESOR
OTHERAUTOMATICMEANSTO PREVENTGRAVITYCIRCULATIONOFTHEBOILERWATERDURINGTHECOOLINGCYCLE.
CAUTION:PIPETHEDISCHARGEOFRELIEFVALVETO PREVENTINJURYINTHE EVENTOF PRESSURERELIEE SUGGEST
DISCHARGETOBE PIPEDTODRAIN.PIPEFULLSIZE OFOUTLET.
H - GAS PIPING
1--Gas supplypipingistobe sizedand installedproperlyinorder toprovidesupplyof gassufficientto meetthemaximumdemandwithoutundue
lossof pressurebetweenthe meterandthe boiler.
2_onsult the followingtablefor propersizing of gaspiping for variouslengthsand diameters.
CAPACITYOF PIPEOF DIFFERENTDIAMETERSANDLENGTHSINCU. FT PERHOURWITHPRESSUREDROPOF 0.3 IN.AND
SPECIFICGRAVITYOF0.60. NOALLOWANCEFORAN ORDINARYNUMBEROF FITTINGSIS REQUIRED,
PipeLength 3/4" 1" 11h" 11/2"
Feet Pipe Pipe Pipe Pipe
10 278 520 1,050 1,600
20 190 350 730 1,100
30 152 285 590 890
40 130 245 500 760
50 115 215 440 670
60 105 195 400 610
MULTIPLIERSTO BEUSEDWITH ABOVETABLE,WHENTHESPECIFICGRAVITYOFTHEGASIS OTHERTHAN0.60
SpecificGravity 0.5 0.55 0.60 0.65 0.70
Multiplier 1.10 1.04 1.00 0.962 0.926
3.-Locate the droppipe adjacentto,butnotin frontof theboiler.
4--Locate a tee in thedroppipeat sameelevationas thegasinletconnectionto the boiler.Extendthe droppipeto a pipecapasshownin Figure
19to forma sedimenttrap.
5--Install a groundjoint unionaheadofthe gascontrolassemblyto permitservicingofthe equipment.See Figure19.Somelocalcodesrequirean
additionalshut-offvalve.Ifyour coderequiressucha valve,a suggestedlocationis shownin Figure19.
6_OTE: Wheninstallingboiler besure a pipecompoundresistanttotheactionof liquefiedpetroleumis used.
7--Check pipingfor leaks.Alwayscheckleakswitha waterandsoapsolutionor equal.DONOTUSE A FLAMEFORCHECKINGGASLEAKS,
8--The boilerandits individualshut-offvalvemustbedisconnectedfromthe gassupplypipingsystemduringanypressuretestingofthat system
attest pressuresin excessof r/2psig (3.5kPa),
Theboiler mustbeisolatedfromthe gassupplypipingsystembyclosingits individualmanualshut-offvalveduringanypressuretestingof the
gassupplypipingsystemat testpressureequalto or lessthanV2psig (3.5kPa).
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