Designation:F1685−00(Reapproved2013)AnAmericanNationalStandardStandardSpecificationforPressure-ReducingManifoldsforAirorNitrogenSystems1ThisstandardisissuedunderthefixeddesignationF1685;thenumberimmediatelyfollowingthedesignationindicatestheyearoforiginaladoptionor,inthecaseofrevision,theyearoflastrevision.Anumberinparenthesesindicatestheyearoflastreapproval.Asuperscriptepsilon(´)indicatesaneditorialchangesincethelastrevisionorreapproval.1.Scope1.1Thisspecificationcoversthedesign,construction,test-ingandoperatingrequirementsforpressure-reducingmani-foldsforairornitrogensystems,referredtohereinalsoasmanifolds.Thetermmanifoldconstitutesthecombinationofallcomponentsandpipingbetween,andincluding,theinletandoutletports(seeFig.1andFig.2).1.2Thevaluesstatedininch-poundunitsaretoberegardedasthestandard.Thevaluesgiveninparentheses(metricSIunits)areforinformationonly.2.ReferencedDocuments2.1ASTMStandards:2F992SpecificationforValveLabelPlatesF1508SpecificationforAngleStyle,PressureReliefValvesforSteam,Gas,andLiquidServicesF1795SpecificationforPressure-ReducingValvesforAirorNitrogenSystems2.2AmericanSocietyofMechanicalEngineers(ASME):B1.1UnifiedScrewThreads32.3MilitaryStandardsandSpecifications:MIL-STD-167-1MechanicalVibrationsofShipboardEquipment(TypeI—EnvironmentalandTypeII—Inter-nallyExcited)4MIL-STD-740AirborneandStructureborneNoiseMeasure-mentsandAcceptanceCriteriaofShipboardEquipment4MS16142Boss,GasketSealStraightThreadTubeFitting,StandardDimensionsfor4MIL-S-901ShockTests,H.I.(High-Impact);ShipboardMachinery,EquipmentandSystems,Requirementsfor4MIL-F-1183Fittings,Pipe,CastBronze,Silver-Brazing,GeneralSpecificationfor42.4GovernmentDrawings:NavalSeaSystemsCommand(NAVSEA):NAVSEA803-1385884Unions,FittingsandAdaptersButtandSocketWelding6000PSI,WOGandOXY(IPS)4NAVSEA803-1385943Unions,SilverBrazing3000PSI,WOG,IPS,forUTInspection4NAVSEA803-1385946Unions,Bronze,SilverBrazing,WOGforUTInspection,1500PSI,WOG43.Terminology3.1Definitions:3.1.1accuracyofregulation—theamountbywhich...
