Estimation of Plastic Bending Moment of Offshore Pipelines

J. Ocean Eng. Technol. 2003;17(2):21-26.

해저관로의 대변형 굽힘에 의한 소성 모멘트 추정

이종현,최한석,이승건

부산대학교 조선해양공학과,부산대학교 조선해양공학과,부산대학교 조선해양공학과

Keywords: Offshore Pipeline, Plastic Bending, Bending Moment, Reeling

핵심용어: 해저배관, 소성 변형, 굽힘 모멘트, 릴 공법

Abstract

The reel-lay method of submarine pipelines a continuous string of pipe coiled onto a reel. Assembly of this pipe that is string is accomplished onshore by welding, and nondestructive testing is carried out prior to coiling the pipe. The total length of pipes on the reel depends on the reel and pipe diameters. Pipeline installation is accomplished by uncoiling, straightening the pipe, and laying out the pipe string onto the seabed as the barge moves forward. Installation associated with coiling and uncoiling is related to the bending moment and strain relationship of the pipeline, A highgrade pipe material is required when the reel-lay method is used. This paper is concerned with the highly plastic bending moment of the pipeline, including the effect of ovality. Moment calculation in the pipe is accomplished by the numerical method, including the variable ovalities during the plastic bending of the pipe string. The new calculation method of the high plastic bending moment was applied to the reel-lay method.