HAR 6-77-154
HAR 6-77-154 Uprating to a pressure that will produce a hoop stress of thirty percent or
more of SMYS in steel pipelines.#
(a)Unless the requirements of this section have been met, no person may subject any segment of a steel pipeline to an operating pressure that will produce a hoop stress of thirty percent or more of SMYS and that is above the established maximum allowable operating pressure.#
(b)Before increasing operating pressure above the previously established maximum allowable operating pressure the operator shall:#
(1)Review the design, operating, and maintenance history and previous testing of the segment of pipeline and determine whether the proposed increase is safe and consistent with the requirements of this chapter; and#
(2)Make any repairs, replacements, or alterations, in the segment of pipeline that are necessary for safe operation at the increased pressure.#
(c)After complying with subsection#
(b), an operator may increase the maximum allowable operating pressure of a segment of pipeline constructed before September 12, 1970, to the highest pressure that is permitted under section 6-77-166, using as test pressure the highest pressure to which the segment of pipeline was previously subjected (either in a strength test or in actual operation).#
(d)After complying with subsection#
(b), an operator that does not qualify under subsection#
(c)may increase the previously established maximum allowable operating pressure if at least one of the following requirements is met:#
(1)The segment of pipeline is successfully tested in accordance with the requirements of this chapter for a new line of the same material in the same location;#
(2)An increased maximum allowable operating pressure may be established for a segment of pipeline in a Class 1 location if the line has not previously been tested; and if: (A) It is impractical to test it in accordance with the requirements of this chapter; (B) The new maximum operating pressure does not exceed eighty percent of that allowed for a new line of the same location; and (C) The operator determines that the new maximum allowable operating pressure is consistent with the condition of the segment of pipeline and the design requirements of this chapter.#
(e)Where a segment of pipeline is uprated in accordance with subsection#
(c)or subsection#
(d)(2), the increase in pressure must be made in increments that are equal to:#
(1)Ten percent of the pressure before the uprating; or#
(2)Twenty-five percent of the total pressure increase; whichever produces the fewer number of increments. [Eff ] (Auth: HRS '269-6) (Imp: 49#