Designation:F1437–01AnAmericanNationalStandardStandardPracticeforInclinedCargoTankLadders1ThisstandardisissuedunderthefixeddesignationF1437;thenumberimmediatelyfollowingthedesignationindicatestheyearoforiginaladoptionor,inthecaseofrevision,theyearoflastrevision.Anumberinparenthesesindicatestheyearoflastreapproval.Asuperscriptepsilon(e)indicatesaneditorialchangesincethelastrevisionorreapproval.1.Scope1.1Thispracticeprovidesdesign,construction,andinstal-lationcriteriaforinclinedladderstobeinstalledwithincargotanks.1.2Whereladdersareattachedtoplatforms,seeFig.1andFig.2.1.3ValuesstatedinSIunitsaretoberegardedasthestandard.Thevaluesstatedinparenthesesareprovidedforinformationpurposesonly.2.ReferencedDocuments2.1ASTMStandards:A36/A36MSpecificationforStructuralSteel22.2OtherDocuments:AmericanBureauofShippingRulesforBuildingandClassingSteelVessels3AmericanWeldingSocietyPublication,AWSD1.1Struc-turalWeldingCode—Steel4SAEAMS-C-27725Coatings,CorrosionPreventative,Polyurethane,forAircraftIntegralFuelTanksforUseto250DegreesF(121DegreesC)5SteelStructuresPaintingCouncilSpecification63.Classification3.1Laddersshallbeclassifiedintotwotypes:3.1.1TypeI—Laddersinstalledwithincargotankscarryingcargootherthanfueloil,and3.1.2TypeII—Laddersinstalledwithincargotankscarryingfueloil.4.SignificanceandUse4.1Thispracticeestablishestheprocedurefortheconstruc-tionandinstallationofinclinedladderstobefabricatedandinstalled,bytheshipyards,withinthecargotanks.5.MaterialsandManufacture5.1Materials—(TypeI):5.1.1Stringers—230-mm(approximately9-in.)by50-mm(approximately17⁄8-in.)structuralchannelsofcarbonsteel.(SeeSpecificationA36/A36M.)5.1.2UpperandLowerClips—Flatbarsofcarbonsteel.(SeeSpecificationA36/A36M.)5.1.3HandrailsandStanchions—25mm(approximately1in.)diametercarbonsteel.(SeeSpecificationA36/A36M.)5.1.4Treads—75-mm(approximately3-in.)by75-mmby10-mm(approximately3⁄8-in.)structuralanglesofcarbonsteel.(SeeSpecificationA36/A36M.)5.2Materials—(TypeII):5.2.1Stringers—Structuralflatbarsofca...
