Haw. Code R. § 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.
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