ASTM_B_891_-_12.pdf

Designation:B89112Standard Specification forSeamless and Welded Titanium and Titanium AlloyCondenser and Heat Exchanger Tubes with EnhancedSurface for Improved Heat Transfer1This standard is issued under the fixed designation B891;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()indicates an editorial change since the last revision or reapproval.1.Scope*1.1 This specification2covers seamless and welded titaniumand titanium alloy tubing on which at least part of the externalor internal surface has been enhanced by cold forming forimproved heat transfer.The tubes are used in surfacecondensers,evaporators,heat exchangers,coils,and similarheat transfer apparatus in diameters up to and including 1 in.(25.4 mm).The base tube wall thickness is typically at least0.049 in.average,but lighter gauge may be negotiated with themanufacturer.1.2 Tubing purchased to this specification will typically beinserted through close-fitting holes in tubesheets,baffles,orsupport plates spaced along the tube length such as defined inthe Tubular Exchanger Manufacturers Association(TEMA)Standard.3The tube ends will also be expanded,and may thenbe welded.Tube may also be bent to form U-tubes or be coiledor otherwise formed,although tight radii may require unen-hanced length for the bends.1.3 The values stated in inch-pound units are to be regardedas standard.The values given in parentheses are mathematicalconversions to SI units that are provided for information onlyand are not considered standard.1.4 The following precautionary statement pertains to thetest method portion only:Section 8,9,10 and S1 of thisspecification:This standard does not purport to address all ofthe safety concerns,if any,associated with its use.It is theresponsibility of the user of this standard to establish appro-priate safety and health practices and determine the applica-bility of regulatory limitations prior to use.2.Referenced Documents2.1 ASTM Standards:4A1047/A1047M Test Method for Pneumatic Leak Testing ofTubingB338 Specification for Seamless and Welded Titanium andTitanium Alloy Tubes for Condensers and Heat Exchang-ersE426 Practice for Electromagnetic(Eddy-Current)Examina-tion of Seamless and Welded Tubular Products,Titanium,Austenitic Stainless Steel and Similar AlloysE1316 Terminology for Nondestructive Examinations3.Terminology3.1 Definitions of Terms Specific to This Standard:3.1.1 base tube,nthe seamless or welded tube conformingto Specification B338 prior to enhancing.3.1.2 finished tube,nthe tube following enhancement andany heat treatment,forming,or other processing specified.3.1.3 enhanced tube or section,nall or sections of tubelength that have been mechanically worked inside,outside,orboth,to produce increased surface area for improved heattransfer.3.1.4 finned section,nsections of tube exterior length thathave been mechanically worked to produce increased surfacearea for improved heat transfer;see Table 1 for nomenclatureof finning details.3.1.5 ribbed section,nsections of tube interior length thathave been mechanically worked to produce increased surfacearea for improved heat transfer;see Table 1 for nomenclatureof ribbing details.3.1.6 plain ends,ntube ends that have not been enhancedto allow for tube expansion for which properties are essentiallyidentical to the base tube.3.1.7 land,nsection of finished tube where the exteriorand the interior surfaces have not been enhanced,to provide1This specification is under the jurisdiction of ASTM Committee B10 onReactive and Refractory Metals and Alloys and is the direct responsibility ofSubcommittee B10.01 on Titanium.Current edition approved March 1,2012.Published March 2012.Originallyapproved in 1998.Last previous edition approved in 2004 as B891 (2004).DOI:10.1520/B0891-12.2For ASME Boiler and Pressure Vessel Code applications,see related Specifi-cation SB-_ in Section II of that Code.3Available from Tubular Exchanger Manufacturers Association,Inc.25 NorthBroadway Tarrytown,NY 10591,www.tema.org.4For 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 States1 better support where passing through baffles,or for sections oftube that will subsequently be formed as U-bends;normallyneither inside nor outside surfaces are enhanced in the land.3.2 Condition(of finished tubes):3.2.1 as-enhanced tube,ntube which is supplied with nothermal treatment following enhancement.3.2.2 annealed tube,ntube where at least the enhancedlength has been heat treated such that a recrystalized micro-structure r