ASTM_F_1437_-_01.pdf

Designation:F 1437 01An American National StandardStandard Practice forInclined Cargo Tank Ladders1This standard is issued under the fixed designation F 1437;the number immediately following the designation indicates the year oforiginal adoption or,in the case of revision,the year of last revision.A number in parentheses indicates the year of last reapproval.Asuperscript epsilon(e)indicates an editorial change since the last revision or reapproval.1.Scope1.1 This practice provides design,construction,and instal-lation criteria for inclined ladders to be installed within cargotanks.1.2 Where ladders are attached to platforms,see Fig.1 andFig.2.1.3 Values stated in SI units are to be regarded as thestandard.The values stated in parentheses are provided forinformation purposes only.2.Referenced Documents2.1 ASTM Standards:A 36/A 36M Specification for Structural Steel22.2Other Documents:American Bureau of Shipping Rules for Building andClassing Steel Vessels3American Welding Society Publication,AWS D 1.1 Struc-tural Welding CodeSteel4SAE AMS-C-27725 Coatings,Corrosion Preventative,Polyurethane,for Aircraft Integral Fuel Tanks for Use to250 Degrees F(121 Degrees C)5Steel Structures Painting Council Specification63.Classification3.1 Ladders shall be classified into two types:3.1.1 Type ILadders installed within cargo tanks carryingcargo other than fuel oil,and3.1.2 Type IILadders installed within cargo tanks carryingfuel oil.4.Significance and Use4.1 This practice establishes the procedure for the construc-tion and installation of inclined ladders to be fabricated andinstalled,by the shipyards,within the cargo tanks.5.Materials and Manufacture5.1 Materials(Type I):5.1.1 Stringers230-mm(approximately 9-in.)by 50-mm(approximately 178-in.)structural channels of carbon steel.(See Specification A 36/A 36M.)5.1.2 Upper and Lower ClipsFlat bars of carbon steel.(See Specification A 36/A 36M.)5.1.3 Handrails and Stanchions25 mm(approximately 1in.)diameter carbon steel.(See Specification A 36/A 36M.)5.1.4 Treads75-mm(approximately 3-in.)by 75-mm by10-mm(approximately38-in.)structural angles of carbon steel.(See Specification A 36/A 36M.)5.2 Materials(Type II):5.2.1 StringersStructural flat bars of carbon steel.(SeeSpecification A 36/A 36M.)5.2.2 Upper and Lower ClipsFlat bars of carbon steel.(See Specification A 36/A 36M.)5.2.3 Treads25-mm(approximately 1-in.)by 25-mmsquare bars of carbon steel.(See Specification A 36/A 36M.)5.3 Manufacture:5.3.1 All welding shall be in accordance with AmericanBureau Shipping Rules for Building and Classing Steel Vesselsor AWS D 1.1.6.Dimensions6.1 Dimensions indicated are typical.However,these di-mensions can be changed to suit other existing structures.6.2 The tread lengths,or the clear widths,between thestringers for Type I ladders,for commercial and naval ships,shall be 455 mm(approximately 18 in.)and 610 mm(approxi-mately 24 in.),respectively.6.3 The tread lengths or clear widths between stringers forType II ladders shall be 380 mm(approximately 15 in.).6.4 The lengths of the ladder shall be fabricated to suitexisting requirements.6.5 Tolerance shall be 66 mm(approximately14in.).1This practice is under the jurisdiction of ASTM Committee F25 on Ships andMarine Technology and is the direct responsibility of Subcommittee F25.03 onOutfitting.Current edition approved Nov.10,2001.Published January 2002.2Annual Book of ASTM Standards,Vol 01.04.3Available from American Bureau of Shipping,ABS Plaza,16855 NorthchaseDr.,Houston,TX 77060.4Available from American Welding Society,550 N.W.LeJeune Rd.,Miami,FL33126.5Available from Standardization Documents Order Desk,Naval Sea SystemsCommand,SEA03R42,2531 Jefferson Davis Highway,Arlington,VA222425160.6Available from Steel Structures Painting Council,40 24th St.,6th Floor,Pittsburgh,PA 152224656.1Copyright ASTM International,100 Barr Harbor Drive,PO Box C700,West Conshohocken,PA 19428-2959,United States.6.6 Type I ladders shall have the following dimensions:installed angle:50 to 69 from the horizontal;tread depth:175to 250 mm(approximately 7 to 10 in.)at 50,tapering to 75mm(approximately 3 in.)at 69;riser height 175 to 300 mm(approximately 7 to 12 in.);handrail 25 to 31 mm(1 to 114in.)in diameter.6.7 Type I ladder tread surfaces shall have slip-resistantsurfaces of a material compatible with materials to be carriedin that tank.6.8 Type II ladders shall be as follows:installed angle 70 to90 from the horizontal;treads shall be equally spaced at amaximum of 305 mm(approximately 12 in.);the distance fromthe top tread to the upper walking surface is to be approxi-mately equal to the normal tread spacing;and the distance fromthe bottom tread to the lower walking surface is not to exceed375 mm(approximately 15 in.).7.Workmanship,Finish,and Appearance7.1 Ladders shall be free of all sharp edges,burrs,projec-tions,weld splatter,and other defects which might be injuriousto personnel or equipment or both.7.2 For cargo tanks carrying cargo other than fuel oils,co