Rinnai RL75I, RL94I installation manual Pipe Sizing Procedure Example

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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 below information is provided as an example. The appropriate table from the applicable code must be used.

1.For some tables, you will need to determine the cubic feet per hour of gas required by dividing the gas input 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.

Gas Input of all gas products (BTU / HR)

Cubic Feet per Hour (CFH) =

Heating Value of Gas (BTU / FT 3 )

2.Use the table for your gas type and pipe type to find the pipe size required. The pipe size must be able to provide the required cubic feet per hour of gas or the required BTU/hour.

Example: The heating value of natural gas for your location is 1000 BTU/FT3. The gas input of the RL94i is 199,000 BTU/HR. Additional appliances at the location require 65,000 BTU/hr. Therefore the cubic feet per hour = (199,000 + 65,000) / 1000 = 264 FT3/HR. If the pipe length is 10 feet then the 3/4 inch pipe size is capable of supplying 264 FT3/HR of natural gas.

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

 

 

 

 

 

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

 

 

 

 

 

VB Series Indoor LS Manual

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Contents REU-VB2528FFUD-US Table of Contents RL75i RL94i R98LSi SpecificationsDescription of Operation Consumer Safety InformationSafety Definitions Safety Behaviors and Practices Safety FeaturesMC-91-1US & MCC-91-1US Temperature ControllerMC-91 MCC-91 MC-100 BC-100 MC-502 Description Features Available on Temperature ControllersFeatures Operating InstructionsTemperature Controller Settings How to Set the TemperatureModel Temperature Settings Available ºF MCC-91 Temperature Controller Temperature Options Without a Temperature ControllerSetting the Sound Volume Voice Prompt Re-setting the Maximum Temperature RL75 and RL94 onlySetting the Water Volume Using the Water Smart / Bath Fill FunctionOverview Models MC-91 and MCC-91 Setting Controller to MuteSetting the Clock Filling the TubMaintenance Code Fault Remedy Error CodesCode Accessing Operating Information Trouble Shooting for Common IssuesWater Quality Circulating Pump Flushing the Heat Exchanger Error Code LC orGeneral Instructions Installation InstructionsAttachment of the Water Heater Clearances from ApplianceGas Piping Electrical ConnectionGeneral Instructions Pipe Sizing Procedure Example Water Piping Isolation Valves Installation InstructionsPressure Relief Valve Installation Instructions Pressure Relief Valve MaintenancePressure Relief Valve Requirements Piping RequirementsFreeze Protection Freeze Protection When the water heater or external piping has frozenManual draining of the water heater KEY Freeze Protection PipingRinnai Water Heater Recommended Piping for Basic InstallationFor this application Recommended Piping for Circulation SystemsIntake / Exhaust Guidelines Venting InstructionsCondensate Maximum Vent Length Manufacturer Product Parts Vent ProductsFlue Terminal Clearances ANS Z21.10.3, CSA Description Canadian Installations US InstallationsInside Corner Additional Clearances Vent TerminalFlue Installation Concentric Venting RL75i, RL94i Venting Clearances to Combustibles Flue Installation R98LSi, R98LSi-ASMEAir Intake Assembly Exhaust Pipe AssemblyVertical Terminations Horizontal with Concentric TerminationGuidelines Connecting Multiple Water HeatersHigh Altitude Installations Number Connected Accessories Necessary Water HeatersCanada only Cable Lengths and Size Temperature Controller InstallationConfigurations LocationOutline of Remote Mounting the ControllerOperating Instructions For Your Safety Read Before OperatingPressure Drop Curve Technical DataOutlet Flow Data Pumps Temperature SettingReplacement Space HeatingRL75i, RL94i R98LSi, R98LSi-ASME DimensionsLadder Diagram for RL75i and RL94i HOT Ladder Diagram for R98LSi and R98LSi-ASMELimited Warranty Warranty InformationConsumer Support What will Rinnai do? Important In the State of Massachusetts 248 CMR 4.00 State RegulationsInstructions dutilisation Instructions d’installationTemp. d’eau Instructions dutilisationOptions de température sans contrôleur à distance Plages de température avec un contrôleur de températureModel Plages de température disponible ºF Nettoyage EntretienInstructions générales Fixation du chauffe-eau Écartements par rapport à lappareilTuyauterie de gaz Installation à altitude élevéeInstructions générales Valve à Bille / Valve de dégagement de pression RL75i, RL94i Tuyauterie deauSoupape de sûreté Qualité de leauLégende Tuyauterie recommandée pour installation de baseConsignes pour aspiration/évacuation Instructions de ventilationCondensat 12.5 m 10.7 m Longueur maximum de ventilationConstructeur Produit Pièces Produits de ventilationHorizontale Nest PAS Permise Espacements pour terminaison de cheminée ANS Z21.10.3, CSAInstallation de conduit de cheminée RL75i, RL94i Terminaisons horizontales Installation de conduit de cheminée R98LSi, R98LSi-ASMEEnsemble de prise dair Montage du tuyau dévacuationTerminaisons verticales Terminaison horizontale concentriqueVanneMa ualmanuelleValve Instructions dutilisationPhase Diagramme en escalier RL75i, RL94iPhase TRE NEU RAL Diagramme en escalier R98LSi, R98LSiASMECombien de temps dure la couverture ? Support à la clientèleInformations sur la garantie Quest-ce qui est couvert ?Que fait Rinnai pour exercer la garantie ? VB Series Indoor LS Manual VB Series Indoor LS Manual VB Series Indoor LS Manual VB2528FFU VB2735FFU VA3237FFU