HAR 6-77-145
HAR 6-77-145 Strength test requirements for steel pipeline to operate at a hoop stress of
thirty percent or more of SMYS.#
(a)Except for service lines, each segment of a steel pipeline that is to operate at a hoop stress of thirty percent or more of SMYS must be strength tested in accordance with this section to substantiate the proposed maximum allowable operating pressure. In addition, in a Class 1 or Class 2 location, if there is a building intended for human occupancy within 300 feet of a pipeline, a hydrostatic test must be conducted to a test pressure of at least 125 percent of maximum operating pressure on that segment of the pipeline within 300 feet of such a building, but in no event may the test section be less than 600 feet unless the length of the newly installed or relocated pipe is less than 600 feet. However, if the buildings are evacuated while the hoop stress exceeds fifty percent of SMYS, air or inert gas may be used as the test medium.#
(b)In a Class 1 or Class 2 location, each compressor station, regulator station, and measuring station, must be tested to at least Class 3 location test requirements.#
(c)Except as provided in subsection#
(e), the strength test must be conducted by maintaining the pressure at or above the test pressure for at least eight hours.#
(d)If a component other than pipe is the only item being replaced or added to a pipeline, a strength test after installation is not required, if the manufacturer of the component certifies that:#
(1)The component was tested to at least the pressure required for the pipeline to which it is being added; or#
(2)The component was manufactured under a quality control system that ensures that each item manufactured is at least equal in strength to a prototype and that the prototype was tested to at least the pressure required for the pipeline to which it is being added.#
(e)For fabricated units and short sections of pipe, for which a post installation test is impractical, a preinstallation strength test must be conducted by maintaining the pressure at or above the test pressure for at least four hours. [Eff ] (Auth: HRS '269-6) (Imp: 49#