(a) Copper pipe used in mains must have a minimum wall thickness of 0.065 inches (1.65 millimeters) and must be hard drawn.
(b) Copper pipe used in service lines must have wall thickness not less than that indicated in the following table:
| Standard size inch (millimeter) | Nominal O.D. inch (millimeter) | Wall thickness inch (millimeter) | |
| Nominal | Tolerance | ||
| 1⁄2 (13) | .625 (16) | .040 (1.06) | .0035 (.0889) |
| 5⁄8 (16) | .750 (19) | .042 (1.07) | .0035 (.0889) |
| 3⁄4 (19) | .875 (22) | .045 (1.14) | .004 (.102) |
| 1 (25) | 1.125 (29) | .050 (1.27) | .004 (.102) |
| 11⁄4 (32) | 1.375 (35) | .055 (1.40) | .0045 (.1143) |
| 11⁄2 (38) | 1.625 (41) | .060 (1.52) | .0045 (.1143) |
(c) Copper pipe used in mains and service lines may not be used at pressures in excess of 100 p.s.i. (689 kPa) gage.
(d) Copper pipe that does not have an internal corrosion resistant lining may not be used to carry gas that has an average hydrogen sulfide content of more than 0.3 grains/100 ft 3 (6.9/m 3) under standard conditions. Standard conditions refers to 60 °F and 14.7 psia (15.6 °C and one atmosphere) of gas.
Source: 35 FR 13257, Aug. 19, 1970, as amended by Amdt. 192-62, 54 FR 5628, Feb. 6, 1989; Amdt. 192-85, 63 FR 37502, July 13, 1998
Compiled from the Electronic Code of Federal Regulations (eCFR), an editorial compilation and not an official legal edition of the CFR. The official text is the Federal Register and the annual CFR edition. §192.125 on eCFR.