CHAPTER 46. PIPES, TUBES, AND FITTINGS
Table 3 lists properties of ASTM B88 copper tube. In the plumbing industry, tube of nominal size approximates the inside diameter. ... In addition, Equation (6) may be used with A53 butt-welded pipe and B88 drawn copper tubing. Thus, for A53 continuous (butt-) welded, seamless, and ERW pipe, and B88 drawn copper tubing, (6)