Designation:F991M–04METRICAnAmericanNationalStandardStandardSpecificationforDocking/DrainPlugandBossAssemblies[Metric]1ThisstandardisissuedunderthefixeddesignationF991M;thenumberimmediatelyfollowingthedesignationindicatestheyearoforiginaladoptionor,inthecaseofrevision,theyearoflastrevision.Anumberinparenthesesindicatestheyearoflastreapproval.Asuperscriptepsilon(e)indicatesaneditorialchangesincethelastrevisionorreapproval.1.Scope1.1Thisspecificationprovidesdesign,construction,andpurchasingcriteriafordocking/drainplugandbossassemblies.1.2Assembliesareintendedforinstallationinshell,rudder,andtankbottomplatefrom8through38mm.1.3Assembliesshallbeinstalledatthelowestpointofatankorrudderfordrainingduringdrydocking.1.4ThevaluesstatedinSIunitsaretoberegardedasthestandard.2.ReferencedDocuments2.1ASTMStandards:2B164SpecificationforNickel-CopperAlloyRod,Bar,andWire2.2OtherDocuments:ABSRulesforBuildingandClassingSteelVessels3ANSIB2.1StandardPipeThreadsExceptDryseal43.Classification3.1Dockingplugsandbossesshallbeclassifiedasfollows:3.1.1TypeI—Dockingplugandbossesforplatingfrom8to15mm(seeFig.1).3.1.2TypeII—Dockingplugandbossesforplatinggreaterthan15to38mm(seeFig.2).4.OrderingInformation4.1Ordersformaterialunderthisspecificationshallincludethefollowing:4.1.1ASTMdesignationandyearofissue.4.1.2Type(SeeSection3).4.1.3Optionalnonstandardmaterials.5.MaterialsandManufacture5.1Materials:5.1.1Boss—ABSGradeAorB,plateorbar.5.1.2Plug—SpecificationB164rodorbar.5.1.3Othermaterialsmaybesubstitutedtosuithullcon-structionasapprovedbyregulatorybodies.5.2Manufacture:5.2.1Plugsandbossesshallbemachined.5.2.2ThreadsshallbeinaccordancewithANSIB2.1.6.DimensionsandTolerances6.1DimensionsshallbeasindicatedinFig.1andFig.2.6.2Toleranceshallbe61.5mm.6.3Massshallbeasfollows:TypeITypeIIBoss1.6kg5.7kgPlug0.6kg1.0kgTotal2.2kg6.7kg7.Installation7.1AllweldingshallbetothestandardsoftheRulesforBuildingandClassingofSteelVessels(ABS).7.2Threadsshallbeadequatelyprotectedduringinstalla-tion.7.3Fillplugfacewithport...
