ASTM_A_498_-_A_498M_-_17.pdf

Designation:A498/A498M17Standard Specification forSeamless and Welded Carbon Steel Heat-Exchanger Tubeswith Integral Fins1This standard is issued under the fixed designation A498/A498M;the number immediately following the designation indicates the yearof original adoption or,in the case of revision,the year of last revision.A number in parentheses indicates the year of last reapproval.A superscript epsilon()indicates an editorial change since the last revision or reapproval.1.Scope*1.1 This specification describes seamless or welded low-carbon steel tubes on which the external or internal surface,orboth,have been modified by a cold forming process to producean integral increased surface area for improved heat transfer.The tubes are used in tubular heat exchangers,surfacecondensers,evaporators,superheaters,and similar heat-transfer apparatus in outside diameters up to 2 in.50 mm,inclusive.1.2 UnitsThis specification is expressed in both inch-pound units and in SI units;however,unless the purchase orderor contract specifies the applicable M specification designation(SI units),the inch-pound units shall apply.The values stated ineither inch-pound units or SI units are to be regarded separatelyas standard.Within the text,the SI units are shown in brackets.The values stated in each system may not be exact equivalents;therefore,each system shall be used independently of the other.Combining values from the two systems may result in non-conformance with the standard.1.3 This international standard was developed in accor-dance with internationally recognized principles on standard-ization established in the Decision on Principles for theDevelopment of International Standards,Guides and Recom-mendations issued by the World Trade Organization TechnicalBarriers to Trade(TBT)Committee.2.Referenced Documents2.1 ASTM Standards:2A179/A179M Specification for Seamless Cold-Drawn Low-Carbon Steel Heat-Exchanger and Condenser TubesA214/A214M Specification for Electric-Resistance-WeldedCarbon Steel Heat-Exchanger and Condenser TubesA334/A334M Specification for Seamless and Welded Car-bon and Alloy-Steel Tubes for Low-Temperature ServiceA450/A450M Specification for General Requirements forCarbon and Low Alloy Steel TubesA941 Terminology Relating to Steel,Stainless Steel,RelatedAlloys,and FerroalloysA1016/A1016M Specification for General Requirements forFerritic Alloy Steel,Austenitic Alloy Steel,and StainlessSteel TubesA1047/A1047M Test Method for Pneumatic Leak Testing ofTubing3.Terminology3.1 DefinitionsFor definitions of general terms used in thisspecification,refer to Terminology A941.3.2 Definitions of Terms Specific to This Standard:3.2.1 landa length of unmodified tube between adjacentsections of modified tube;used as support zones for baffles,orfor bending where surface modification might compromisematerial integrity,or for other reasons.3.2.2 modified surfacethe surface of a tube having a seriesof integral fins,grooves,or ribs on the outside diameter,insidediameter,or both,for the purpose of increasing the surface areaand improving heat transfer.3.2.3 unmodified surfacethe cylindrical surface of a tubemade to the reference standards.3.3 Symbols(Integral Fin Tube Nomenclature):3.3.1 Bare tube symbols,see Fig.1,Fig.2,or Fig.3.3.3.1.1 OD=outside diameter of unmodified sections,and3.3.1.2 W=wall thickness of unmodified sections.3.3.2 OD surface modification symbols,see Fig.1.3.3.2.1 od=outside diameter of modified sections,3.3.2.2 rd=root diameter of outside fins,3.3.2.3 Wf=wall thickness at fin groove,either minimum oraverage,3.3.2.4 FH=fin height,3.3.2.5 Nfpu=number of fins per unit length,the reciprocalof p,3.3.2.6 p=pitch,the distance from a point on one fin to thecorresponding point on the adjacent fin along the tube longi-tudinal axis,and1This specification is under the jurisdiction of ASTM Committee A01 on Steel,Stainless Steel and Related Alloys and is the direct responsibility of SubcommitteeA01.09 on Carbon Steel Tubular Products.Current edition approved March 15,2017.Published May 2017.Originallyapproved in 1963.Last previous edition approved in 2014 as A498/A498M 14.DOI:10.1520/A0498_A0498M-17.2For referenced ASTM standards,visit the ASTM website,www.astm.org,orcontact ASTM Customer Service at serviceastm.org.For Annual Book of ASTMStandards volume information,refer to the standards Document Summary page onthe ASTM website.*A Summary of Changes section appears at the end of this standardCopyright ASTM International,100 Barr Harbor Drive,PO Box C700,West Conshohocken,PA 19428-2959.United StatesThis international standard was developed in accordance with internationally recognized principles on standardization established in the Decision on Principles for theDevelopment of International Standards,Guides and Recommendations issued by the World Trade Organization Technical Barriers to Trade(TBT)Committee.1 3.3.2.7 p=the reciprocal of Nfpu.3.3.3 ID surface modification symbols,see Fig.2.3.3.3.1 od=outside diameter of