Section 6-77-99 - Wrinkle bends in steel pipe(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.[Eff ] (Auth: HRS § 269-6) (Imp: 49C.F.R. §192.315, OCT 1, 1990)