Other coppers may also be used. Table 1 identifies the seven standard types of copper tube and their most common applications. The table also shows the ASTM Standard appropriate to the use of each type along with a listing of its commercially available lengths, sizes and tempers. Each type represents a series of sizes with different wall thicknesses. Type K tube has thicker walls than Type L tube, and Type L walls are thicker than Type M, for any given diameter.
All inside diameters depend on tube size and wall thickness.
This special 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. Tue in the bending and soft tempers can be joined by the same techniques and also by the use of flare-type and compression fittings. The dimensions and other physical characteristics of Types K,L, M and DWV tube are given in Table 2a , Table 2b , Table 2c , and Table 2d . All four types are used for both pressure and non-pressure applications within the range of their respective safe working pressures as described in Table 3a , Table 3b , Table 3c and Table 3d .