Section 6-77-78 - Miter joints(a) A miter joint on steel pipe to be operated at a pressure that produced a hoop stress of thirty percent or more of SMYS may not deflect the pipe more than 3E.(b) A miter joint on steel pipe to be operated at a pressure that produces a hoop stress of less than thirty percent, but more than ten percent, of SMYS may not deflect the pipe more than 12-1/2E and must be a distance equal to one pipe diameter or more away from any other miter joint, as measured from the crotch of each joint.(c) A miter joint on steel pipe to be operated at a pressure that produces a hoop stress of ten percent or less of SMYS may not deflect the pipe more than 90E.[Eff ] (Auth: HRS § 269-6) (Imp: 49 C.F.R. §192.233, OCT 1, 1990)