Haw. Code R. § 6-77-180 - Transmission lines: permanent field repair of welds

Each weld that is unacceptable under section 6-77-80(c) must be repaired as follows:

(1) If it is feasible to take the segment of transmission line out of service, the weld must be repaired in accordance with the applicable requirements of section 6-77-82.

(2) A weld may be repaired in accordance with section 6-77-82 while the segment of transmission line is in service if:

(A) The weld is not leaking;

(B) The pressure in the segment is reduced so that it does not produce a stress that is more than twenty percent of the SMYS of the pipe; and

(C) Grinding of the defective area can be limited so that at least 1/8-inch thickness in the pipe weld remains;

(3) A defective weld which cannot be repaired in accordance with paragraph (1) or (2) must be repaired by installing a full encirclement welded split sleeve of appropriate design.

Notes

Haw. Code R. § 6-77-180

[Eff ] (Auth: HRS § 269-6) (Imp: 49 C.F.R. §192.715, OCT 1, 1990)