Hawaii Administrative Rules
Title 6 - DEPARTMENT OF BUDGET AND FINANCE
Division - PUBLIC UTILITIES COMMISSION
Chapter 77 - TRANSPORTATION OF NATURAL AND OTHER GAS BY PIPELINE; MINIMUM SAFETY STANDARDS
Subchapter 9 - MINIMUM SAFETY STANDARDS - GENERAL CONSTRUCTION REQUIREMENTS FOR TRANSMISSION LINES AND MAINS
Section 6-77-99 - Wrinkle bends in steel pipe
Universal Citation: HI Admin Rules 6-77-99
Current through August, 2024
(a) A wrinkle bend may not be made on steel pipe to be operated at a pressure that produces a hoop stress of 30 percent, or more, of SMYS.
(b) Each wrinkle bend on steel pipe must comply with the following:
(1) The bend must
not have any sharp kinks;
(2) When
measured along the crotch of the bend, the wrinkles must be a distance of at
least one pipe diameter;
(3) On
pipe sixteen inches or larger in diameter, the bend may not have a deflection
of more than
1-1/2E
for each wrinkle; and
(4) On pipe
containing a longitudinal weld the longitudinal seam must be as near as
practicable to the neutral axis of the bend.
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