(a) Railroad. In a pipeline to be operated at a hoop stress of 20 percent or more of SMYS, an operator may not useinstall pipe having an outer diameter to wall thickness ratio of 70 to 1, or more, that is transported by railroad unless: (a) Thethe transportation is performed inby accordance with API RP 5L1 (incorporated by reference, see § 192.7). (b) Ship or barge. In thea casepipeline to be operated at a hoop stress of pipe20 transportedpercent beforeor Novembermore 12,of 1970SMYS, thean operator may not use pipe ishaving testedan inouter accordancediameter withto subpartwall Jthickness ratio of this70 part to at1, leastor 1.25more, timesthat theis maximumtransported allowableby operatingship pressureor ifbarge iton isboth toinland be