Rheem H95 Outdoor Series Use and Care Manual - Page 53

Gas Piping

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INSTALLATION INSTRUCTIONS Gas Piping Pipe-SizingProcedure-Example Thegassupplymustbecapableofhandlingtheentire gasloadatthelocation.Gaslinesizingisbasedon gastype,thepressuredropinthesystem,thegas pressuresupplied,andgaslinetype.Forgaspipe sizingintheUnitedStates,refertotheNationalFuel GasCode,NFPA54.ForCanadiangaspipesizing, refertotheNaturalGasandPropaneInstallationCode CAN/CSAB149.1.Theinformationbelowisprovidedas anexample.Theappropriatetablefromtheapplicable codemustbeused. 1.Determinethecubicfeetperhourofgasrequired bydividingthegasinput(ontheratingplate)bythe heatingvalueofthegas(availablefromthelocal gascompany).Thegasinputneedstoincludeall gasproductsatthelocationandthemaximumBTU usageatfullloadwhenallgasproductsareinuse. GasInputof CubicFeet WaterHeater(BTU/HR) PerHour(CFH)=HeatingValueofGas(BTU/FT3) 2.Usethetableforyourgastypetofindthepipesize requiredforyourcubicfeetperhourofgasand yourpipelength. Example:Theheatingvalueofpropanegasfor yourlocationis2500BTU/FT3.Thegasinputofthe tanklesswaterheateris199,900BTU/HR.Additional appliancesatthelocationrequire75,000BTU/HR. Therefore,thecubicfeetperhour= (199,900+75,000)/2500=109FT3/HR.Ifthe pipelengthis100ft.,thenthe3/4-inchpipesize capableofsupplying197FT3/HRofpropanegaswill beadequate. Gas Supply Pipe-SizingTable-NaturalGas Schedule40MetallicPipe InletPressure:Lessthan2psi(55inchesW.C.) PressureDrop:0.3inchesW.C. SpecificGravity:0.60 (Capacityincubicfeetperhour) Length 3/4 PipeSize(inches) 1 11/4 11/2 10 273 514 1060 1580 20 188 353 726 1090 30 151 284 583 873 40 129 243 499 747 50 114 215 442 662 60 104 195 400 600 70 95 179 368 552 80 89 167 343 514 90 83 157 322 482 100 79 148 304 455 125 70 131 269 403 150 63 119 244 366 175 58 109 224 336 200 54 102 209 313 Thisisanexample,inUS,refertocurrentNationalFuelGas Code,NFPA54forcorrectpipesizingchart,andinCanada, refertocurrentCAN/CSAB149.1. Pipe-SizingTable-PropaneGas Schedule40MetallicPipe InletPressure:11.0inchesW.C. PressureDrop:0.5inchesW.C. SpecificGravity:1.50 (Capacityincubicfeetperhour) Length 1/2 PipeSize(inches) 3/4 1 11/4 10 291 608 1150 2350 20 200 418 787 1620 30 160 336 632 1300 40 137 287 541 1110 50 122 255 480 985 60 110 231 434 892 80 101 212 400 821 100 94 197 372 763 125 89 185 349 716 150 84 175 330 677 175 74 155 292 600 200 67 140 265 543 53

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53
INSTALLATION INSTRUCTIONS
Gas Piping
Pipe-Sizing±Procedure±–±Example
The±gas±supply±must±be±capable±of±handling±the±entire±
gas±load±at±the±location.±Gas±line±sizing±is±based±on±
gas±type,±the±pressure±drop±in±the±system,±the±gas±
pressure±supplied,±and±gas±line±type.±±For±gas±pipe±
sizing±in±the±United±States,±refer±to±the±National±Fuel±
Gas±Code,±NFPA±54.±±For±Canadian±gas±pipe±sizing,±
refer±to±the±Natural±Gas±and±Propane±Installation±Code±
CAN/CSA±B149.1.±±The±information±below±is±provided±as±
an±example.±The±appropriate±table±from±the±applicable±
code±must±be±used.
1.±Determine±the±cubic±feet±per±hour±of±gas±required±
by±dividing±the±gas±input±(on±the±rating±plate)±by±the±
heating±value±of±the±gas±(available±from±the±local±
gas±company).±The±gas±input±needs±to±include±all±
gas±products±at±the±location±and±the±maximum±BTU±
usage±at±full±load±when±all±gas±products±are±in±use.
2.±Use±the±table±for±your±gas±type±to±find±the±pipe±size±
required±for±your±cubic±feet±per±hour±of±gas±and±
your±pipe±length.
Example:±The±heating±value±of±propane±gas±for±
your±location±is±2500±BTU/FT
3
.±The±gas±input±of±the±
tankless±water±heater±is±199,900±BTU/HR.±Additional±
appliances±at±the±location±require±75,000±BTU/HR.±
Therefore,±the±cubic±feet±per±hour±=±±
(199,900±+±75,000)/2500±=±109±FT
3
/HR.±If±the±
pipe±length±is±100±ft.,±then±the±3/4-inch±pipe±size±
capable±of±supplying±197±FT
3
/HR±of±propane±gas±will±
be±adequate.
±±±±±±±±±±±±±±±±±±±±±±±±±±±±±±±±±±±±±±±±±Gas±Input±of±
Cubic±Feet±±±±±±±±±±±±±±±±±±±Water±Heater±(BTU/HR)±
Per±Hour±(CFH)±=±±±Heating±Value±of±Gas±(BTU/FT
3
)
Pipe-Sizing±Table±–±Natural±Gas
Schedule±40±Metallic±Pipe
Inlet±Pressure:±Less±than±2±psi±(55±inches±W.C.)
Pressure±Drop:±0.3±inches±W.C.
Specific±Gravity:±0.60±
(Capacity±in±cubic±feet±per±hour)
Length
Pipe±Size±(inches)
3/4
1
1±1/4
1±1/2
10
273
514
1060
1580
20
188
353
726
1090
30
151
284
583
873
40
129
243
499
747
50
114
215
442
662
60
104
195
400
600
70
95
179
368
552
80
89
167
343
514
90
83
157
322
482
100
79
148
304
455
125
70
131
269
403
150
63
119
244
366
175
58
109
224
336
200
54
102
209
313
Pipe-Sizing±Table±–±Propane±Gas
Schedule±40±Metallic±Pipe
Inlet±Pressure:±11.0±inches±W.C.
Pressure±Drop:±0.5±inches±W.C.
Specific±Gravity:±1.50±
(Capacity±in±cubic±feet±per±hour)
Length
Pipe±Size±(inches)
1/2
3/4
1
1±1/4
10
291
608
1150
2350
20
200
418
787
1620
30
160
336
632
1300
40
137
287
541
1110
50
122
255
480
985
60
110
231
434
892
80
101
212
400
821
100
94
197
372
763
125
89
185
349
716
150
84
175
330
677
175
74
155
292
600
200
67
140
265
543
This±is±an±example,±in±US,±refer±to±current±National±Fuel±Gas±
Code,±NFPA±54±for±correct±pipe±sizing±chart,±and±in±Canada,±
refer±to±current±CAN/CSA±B149.1.±
Gas Supply