Designation:A556/A556M−96(Reapproved2012)StandardSpecificationforSeamlessCold-DrawnCarbonSteelFeedwaterHeaterTubes1ThisstandardisissuedunderthefixeddesignationA556/A556M;thenumberimmediatelyfollowingthedesignationindicatestheyearoforiginaladoptionor,inthecaseofrevision,theyearoflastrevision.Anumberinparenthesesindicatestheyearoflastreapproval.Asuperscriptepsilon(´)indicatesaneditorialchangesincethelastrevisionorreapproval.1.Scope1.1Thisspecification2coversminimum-wall-thickness,seamlesscold-drawncarbonsteeltubesincludingbendingintotheformofU-tubes,ifspecified,foruseintubularfeedwaterheaters.1.2Thetubingsizescoveredshallbe5⁄8to11⁄4-in.[15.9to31.8-mm]outsidediameter,inclusive,withminimumwallthicknessesequaltoorgreaterthan0.045in.[1.1mm].1.3Optionalsupplementaryrequirementsareprovided,andwhendesired,shallbestatedintheorder.1.4Thevaluesstatedineitherinch-poundunitsorSIunitsaretoberegardedseparatelyasthestandard.Withinthetext,theSIunitsareshowninbrackets.Thevaluesstatedineachsystemarenotexactequivalents;therefore,eachsystemmustbeusedindependentlyoftheother.Combiningvaluesfromthetwosystemsmayresultinnonconformancewiththespecifi-cation.Theinch-poundunitsshallapplyunlessthe“M”designationofthisspecificationisspecifiedintheorder.2.ReferencedDocuments2.1ASTMStandards:3A450/A450MSpecificationforGeneralRequirementsforCarbonandLowAlloySteelTubesE30TestMethodsforChemicalAnalysisofSteel,CastIron,Open-HearthIron,andWroughtIron(Withdrawn1995)43.OrderingInformation3.1Ordersformaterialunderthisspecificationshouldincludethefollowingasrequiredtodescribethedesiredmaterialadequately:3.1.1Quantity(feet,metres,ornumberofpieces),3.1.2Nameofmaterial(seamlesssteeltubing),3.1.3Dimensions(outsidediameterandminimumwallthickness),3.1.4Length(specificorrandom),3.1.5Manufacture(colddrawn),3.1.6Grade(chemicalcomposition),3.1.7Optionalrequirements,3.1.8BendingRequirements—Iforderspecifiestubestobebent,thedesignoftheU-tubesshallaccompanytheorder.Purchasermustspecifyifstress-reliefannealoftheU-...
