255.715 Transmission lines: permanent field repair of welds. Each weld that is unacceptable und...

(a)If it is feasible to take the segment of transmission line, or distribution main operating at 125 psig (862 kPa) or more in a Class 3 or 4 location, out of service, the weld must be repaired in accordance with the applicable requirements of section 255.245 of this Part.#

(b)A weld may be repaired in accordance with section 255.245 of this Part while the segment is in service if:#

(1)the weld is not leaking;#

(2)the pressure in the segment is reduced so that it does not produce a stress that is more than 20 percent of SMYS; and#

(3)grinding of the defective area can be limited so that at least ⅛-inch thickness in the pipe weld remains.#

(c)A defective weld which cannot be repaired in accordance with subdivision (a) or (b) of this section must be repaired by installing a full encirclement welded split sleeve of appropriate design.#