Specifications

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VIII Gas Piping
 Gaspipingtotheboilermustbesizedtodeliveradequategasfortheboilertoreatthenameplateinputataninlet
pressurebetweentheminimumandmaximumvaluesshownontheratingplate.Formoreinformationongasline
sizing,consulttheutilityortheNationalFuelGasCode.
 Figure8.1showstypicalgaspipingconnectiontotheFCMboiler.Asedimenttrapmustbeinstalledupstreamofallgas
controls.Installthefactoryprovidedmanualshut-offvalveoutsidethejacketwithagroundjointunionasshown.
 Theboileranditsgasconnectionmustbeleaktestedbeforeplacingtheboilerinoperation.Whendoingthis,theboiler
anditsindividualshut-offmustbedisconnectedfromtherestofthesystemduringanypressuretestingofthatsystem
atpressuresinexcessof½psi.Whenpressuretestingthegassystematpressuresof½psiorless,isolatetheboiler
fromthegassupplysystembyclosingitsindividualmanualshut-offvalve.
Figure 8.1: Gas Connection To Boiler