ASTM B891/B891M-19

This international standard was developed in accordance with internationally recognized principles on standardization established in the Decision on Principles for the
Development of International Standards, Guides and Recommendations issued by the World Trade Organization Technical Barriers to Trade (TBT) Committee.
Designation:B891/B891M −19
Standard Specification for
Seamless and Welded Titanium and Titanium Alloy
Condenser and Heat Exchanger Tubes with Enhanced
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Surface for Improved Heat Transfer
This standard is issued under the fixed designation B891/B891M; the number immediately following the designation indicates the year
of original adoption or, in the case of revision, the year of last revision.Anumber in parentheses indicates the year of last reapproval.
A superscript epsilon (´) indicates an editorial change since the last revision or reapproval.
1. Scope* priate safety, health, and environmental practices and deter-
mine the applicability of regulatory limitations prior to use.
1.1 This specification covers seamless and welded titanium
1.5 This international standard was developed in accor-
and titanium alloy tubing on which at least part of the external
dance with internationally recognized principles on standard-
or internal surface has been enhanced by cold forming for
ization established in the Decision on Principles for the
improved heat transfer. The tubes are used in surface
Development of International Standards, Guides and Recom-
condensers, evaporators, heat exchangers, coils, and similar
mendations issued by the World Trade Organization Technical
heat transfer apparatus in diameters up to and including 1 in.
Barriers to Trade (TBT) Committee.
[25.4 mm]. The base tube wall thickness is typically at least
0.049 in. [1.245mm] average, but lighter gauge may be
2. Referenced Documents
negotiated with the manufacturer.
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2.1 ASTM Standards:
1.2 Tubing purchased to this specification will typically be
A1047/A1047MTestMethodforPneumaticLeakTestingof
inserted through close-fitting holes in tubesheets, baffles, or
Tubing
support plates spaced along the tube length such as defined in
B338Specification for Seamless and Welded Titanium and
the Tubular Exchanger Manufacturer’s Association (TEMA)
TitaniumAlloy Tubes for Condensers and Heat Exchang-
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Standard. The tube ends will also be expanded, and may then
ers
bewelded.TubemayalsobebenttoformU-tubesorbecoiled
E426PracticeforElectromagnetic(EddyCurrent)Examina-
or otherwise formed, although tight radii may require unen-
tion of Seamless and Welded Tubular Products, Titanium,
hanced length for the bends.
Austenitic Stainless Steel and Similar Alloys
E1316Terminology for Nondestructive Examinations
1.3 The values stated in either SI units or inch-pound units
are to be regarded separately as standard. The values stated in
3. Terminology
each system may not be exact equivalents; therefore, each
system shall be used independently of the order. Combining
3.1 Definitions of Terms Specific to This Standard:
values from the two systems may result in non-conformance.
3.1.1 base tube, n—theseamlessorweldedtubeconforming
Within the text, the SI units are shown in brackets. The
to Specification B338 prior to enhancing.
inch-poundunitsshallapplyunlessthe“M”designationofthis
3.1.2 finished tube, n—the tube following enhancement and
specification is specified in the order.
any heat treatment, forming, or other processing specified.
1.4 The following precautionary statement pertains to the
3.1.3 enhanced tube or section, n—all or sections of tube
test method portion only: Section 8, 9, 10 and S1 of this
length that have been mechanically worked inside, outside, or
specification:This standard does not purport to address all of
both, to produce increased surface area for improved heat
the safety concerns, if any, associated with its use. It is the
transfer.
responsibility of the user of this standard to establish appro-
3.1.4 finned section, n—sections of tube exterior length that
have been mechanically worked to produce increased surface
area for improved heat transfer; see Table 1 for nomenclature
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This specification is under the jurisdiction of ASTM Committee B10 on
of finning details.
Reactive and Refractory Metals and Alloys and is the direct responsibility of
Subcommittee B10.01 on Titanium.
Current edition approved April 1, 2019. Published May 2019. Originally
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approved in 1998. Last previous edition approved in 2012 as B891–12. DOI: For referenced ASTM standards, visit the ASTM website, www.astm.org, or
10.1520/B0891_B0891M-19. contact ASTM Customer Service at service@astm.org. For Annual Book of ASTM
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Available from Tubular Exchanger Manufacturers Association, Inc. 25 North Standards volume information, refer to the standard’s Document Summary page on
Broadway Tarrytown, NY 10591, www.tema.org. the ASTM website.
*A Summary of Changes section appears at the end of this standard
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