HAR 6-77-181
HAR 6-77-181 Transmission lines: permanent field repair of leaks
in subsection#
(b), each permanent field repair of a leak on a transmission line must be made as follows:#
(1)If feasible, the segment of transmission line must be taken out of service and repaired by cutting out a cylindrical piece of pipe and replacing it with pipe of similar or greater design strength;#
(2)If it is not feasible to take the segment of transmission line out of service, repairs must be made by installing a full encirclement welded split sleeve of appropriate design, unless the transmission line: (A) Is jointed by mechanical couplings; and (B) Operates at less than forty percent of SMYS;#
(3)If the leak is due to a corrosion pit, the repair may be made by installing a properly designed bolt-on-leak clamp; or, if the leak is due to a corrosion pit and on pipe of not more than 40,000 p.s.i. SMYS, the repair may be made by fillet welding over the pitted area a steel plate patch with rounded corners, of the same or greater thickness than the pipe, and not more than one-half of the diameter of the pipe in size.#
(b)Submerged offshore pipelines and submerged pipelines in inland navigable waters may be repaired by mechanically applying a full encirclement split sleeve of appropriate design over the leak. [Eff ] (Auth: HRS '269-6) (Imp: 49#