ASTM B891/B891M-19,Standard Specification for Seamless and Welded Titanium and Titanium Alloy Condenser and Heat Exchanger Tubes with Enhanced Surface for Improved Heat Transfer.
ASTM B891/B891M-19 covers seamless and welded titanium and titanium alloy tubing on which at least part of the external or internal surface has been enhanced by cold forming for improved heat transfer. The tubes are used in surface condensers, evaporators, heat exchangers, coils, and similar heat transfer apparatus in diameters up to and including 1 in. [25.4 mm]. The base tube wall thickness is typically at least 0.049 in. [1.245 mm] average, but lighter gauge may be negotiated with the manufacturer.
Referenced Documents
ASTM A1047/A1047M Test Method for Pneumatic Leak Testing of Tubing
ASTM B338 Specification for Seamless and Welded Titanium and Titanium Alloy Tubes for Condensers and Heat Exchangers
ASTM E426 Practice for Electromagnetic (Eddy Current) Examination of Seamless and Welded Tubular Products, Titanium, Austenitic Stainless Steel and Similar Alloys
E1316 Terminology for Nondestructive Examinations
5. General Requirements
5.1 Tubes described by this specification shall be furnished with plain ends
5.2 Enhanced sections of the tube shall be supplied in the old worked condition produced by the enhancing operation unless specified otherwise in the purchase order (refer to Supplementary Requirements S2 and S3.)
5.3 The tubes shall be able to stand properly conducted expansion and bending without showing cracks or other flaws.
6. Materials and Manufacture
6.1 The enhanced tubes shall be manufactured from nealed seamless or stress relieved or annealed welded b: tubes that conform to the requirements of Specification B338.
7. Condition and/or Heat Treatment
7.1 Straight tubes and the straight sections of U-tubes shall be supplied in the as-enhanced condition as described in 3.2.1 unless specified otherwise by the purchaser (see Supplementary Requirements S2 and S3).
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