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ASTM B919-2019 pdf free download

ASTM B919-2019 pdf free download.Standard Specification for Welded Copper Heat Exchanger Tubes With Internal Enhancement
1. Scope
1.1 This specification establishes the requirements for welded, internally enhanced copper tube, in straight lengths or coils, suitable for use in refrigeration and air conditioning products or other heat exchangers. 1.2 Units—The values stated in inch-pound units are to be regarded as standard. The values given in parentheses are mathematical conversions to SI units that are provided for information only and are not considered standard. 1.3 The product shall be produced of the following coppers. Unless otherwise specified, tubes made from any one of these coppers may be supplied:1.4 The following pertains to the test method described in 18.5 of this specification. This standard does not purport to address all of the safety concerns, if any, associated with its use. It is the responsibility of the user of this standard to establish appropriate safety, health, and environmental prac- tices and determine the applicability of regulatory require- ments prior to use. 1.5 This international standard was developed in accor- dance with internationally recognized principles on standard- ization established in the Decision on Principles for the Development of International Standards, Guides and Recom- mendations issued by the World Trade Organization Technical Barriers to Trade (TBT) Committee.
3. Terminology
3.1 For the definitions ofterms related to copper and copper alloys refer to Terminology B846. 3.2 Definitions ofTerms Specific to This Standard: 3.2.1 bottom wall, n—the wall thickness measured from the base of the enhancement to the outside surface. 3.2.2 enhancement, n—a geometrical feature intentionally formed on a tube I.D. surface to improve heat transfer. 3.2.3 level wound, adj—a type of coil in which the turns are wound into layers parallel to the axis of the coil such that successive turns in a given layer are next to one another. 3.2.4 roundness tolerance, n—the roundness tolerance is defined as the maximum OD at a point minus the minimum OD, at the same plane of intersection of the tube, divided by the specified OD × 100 %.
5. Ordering Information
5.1 Include the following information when placing orders for product under this specification: 5.1.1 ASTM designation number and year of issue; 5.1.2 Copper UNS No.; 5.1.3 Tube type (Section 4); 5.1.4 Temper (Section 8); 5.1.5 Length, diameter, bottom-wall thickness, and en- hancement dimensions. Configuration of the enhanced surface shall be as agreed upon between the manufacturer or supplier and purchaser; 5.1.6 How furnished: straight or coils; 5.1.7 Quantity; 5.1.8 Cuprous oxide test, if required (12.3 and 16.1.4); 5.1.9 Certification, when required (Section 22); and 5.1.10 Mill test report, if required (Section 23).
6. Materials and Manufacture
6.1 Materials: 6.1.1 The material of manufacture shall be a form (cast, bar, cake, slab, etc.) of Copper Alloy UNS No. C10200 or C12200 [or other designation] of such purity and soundness as to be suitable for processing into the products prescribed herein. 6.2 Manufacture: 6.2.1 The welded tube shall be manufactured from either cold rolled or annealed sheet or strip. The sheet or strip shall be formed into a tubular shape on a suitable forming mill. 6.2.2 Welding shall be accomplished by any process that produces forge or fusion welds leaving no crevice visible to the unaided eye in the weld seam. Forge—Welded Tube—The edges of the strip shall be heated to the required welding temperature, usually by a high frequency electric current, and be pressed firmly together causing a forged-type joint to be formed with internal and external flash. Fusion—Welded Tube—The edges of the tube shall be brought together and welded, usually by a GTAW welding process, without the addition of filler metal, causing a fusion- type joint to be formed with no internal or external flash. Flash Removal—The external flash of forge welded tubes, if present, shall be removed by scarfing. The internal flash shall be treated by one of the following techniques: (1) IFI—internal flash to remain in the as-welded condition.

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