API RP 5L1: 2002 Recommended Practice for Railroad Transportation of Line Pipe

American Petroleum Institute (API). Sixth Edition, July 2002 . 16 p. The recommendations provided herein apply to the transportation on railcars of API Specification 5L steel line pipe in sizes 23/8 and larger in lengths longer that single random. The recommendations of Section 4 concerned with load stresses are exclusively applicable to API line pipe having diameter to thickness (Dlt) ratios of 50 or more. However, pipe with Dlt ratios well below 50 may suffer fatigue in transit under some circumstances, as noted in the foreword.