ASTM B956-19 pdf free download.Standard Specification for Welded Copper and Copper-Alloy Condenser and Heat Exchanger Tubes with Integral Fins.
This specification establishes the requirements for heat exchanger tubes manufactured from forge-welded copper and copper alloy tubing in straight lengths on which the external or internal surface, or both, has been modified by cold forming process to produce an integral enhanced surface for improved heat transfer.
4. Types of Welded Tube
4.1 Reference Specification B543/B543M for the types of forge welded tube products that will be supplied for the enhancing operation (Section 6).
5. Ordering Information
5.I Include the following information when placing orders for product under this specification as applicable
5. 1. I ASTM designation and year of issue
5.1.2 Copper UNS No. designation (for example, Copper UNS No CI2000)
5.1.3 Tube type (Section 4)
5.1. 4 Temper (Section 8)：
5.1.5 Dimensions. the diameter. wall thickness. whether minimum or nominal wall, and length (Section 14)
5.1.6 Configuration of enhanced surfaces shall be agree upon between the manufacturer and the purchaser (Figs. 1-3).
5.1.7 Quantity
6. Materials and Manufacture
6.1 Material
6.1.1 The material of manufacture shall be welded tube of one of the Copper Alloy UNS Nos listed in 1. I of such purity and soundness as to be suitable for processing into the products prescribed herein
6.1.2 When specified in the contract or purchase order that eat identification or traceability is required, the purchaser shall specify the details desired
6.2 Manufacture:
6.2.1 The product shall be manufacture by cold forming the enhancement of the heat transfer surfaces.
6.3 Product described by this specification shall typically be furnished with unenhanced ends, but may be furnished with enhanced ends or stripped ends from which the O D. enhance ment has been removed by machining.
6.3.1 The enhanced sections of the tube in the as-fabricated temper are in the cold formed condition produced by the enhancing operation.
6.3.2 The unenhanced sections of the tube shall be in the annealed or as-welded temper, and shall be suitable for rolling-in operations.ASTM B956-19 pdf free download.