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Standard tubes

LONG LASTING COPPER TUBE is a favorite choice in plumbing, heating, cooling, and other systems applications. In the United States, it is manufactured to meet the requirements of specifications established by the American Society for Testing and Materials (ASTM'). All tube supplied to these ASTM standards is a minimum of 99.90 percent pure copper. The copper customarily used for tubes supplied to these specifications is deoxidized with phosphorous and referred to as Copper No. 122 or DHP Copper. Other coppers are also sometimes used.
Types of copper tube
There are two principal classes of copper tube. The first is commonly referred to as plumbing tube and includes Types K, L, M, and DWV. The second is ACR tube. for air conditioning and refrigeration field service.

Types K. L. M, and DWV are designated by ASTM standard sizes, with the outside diameter always '/8-inch larger than the standard size. Each type (K, L, M, and DWV) represents a series of sizes with different wall thicknesses. The inside diameters depend on tube size and wall thickness. All four types
Properties
Coppertubes. Types K, L, and M are made according to ASTM Standard Specification B88; DWV is made to ASTM B306.
Are available in drawn temper in straight lengths ordinarily 20 feet long, Types K, L and M are available also in annealed temper in 20-ft straight lengths or in long coils in sizes from ''4 inch to 2 inch.

Copper tube for air conditioning and refrigeration field service (ACR tube) is 'designated by its actual outside diameter. It is available in soft annealed coils or hard-drawn lengths. It is intended for use in the field with special fittings for connections, repairs, and alterations in air conditioning and refrigeration installations,

In the piping trades, drawn tube is often referred to as "hard" tube, and annealed tube as "soft" tube. Drawn tube is also furnished in ^''bending temper." This light-drawn temper of intermediate strength and hardness may be specified for applications requiring bending. Tube in the hard temper condition can be joined by soldering or brazing, using capillary fittings, or by welding. Tube in the bending and soft tempers can be joined by the same techniques and also by the use of flare-type compression fittings. It is also possible to expand the end of one tube so that it can be joined to another by soldering or brazing without a capillary fitting — a procedure that can be efficient and economical in many installations,

All four types are used for both pressure and non-pressure applications within the range of their respective working pressures.
Seamless ACR tube is made to ASTM Standard Specification B280.

Available in outside diameter sizes of 1/4" to 3/4" in 15m and 46m lengths with wall thickness of 0.030" to 0.040"