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TECHNICAL BRIEFS

Analysis of the Horizontal to Vertical Orientation of Deep Water Risers

[+] Author and Article Information
A. J. Healey

University of Texas at Austin, Austin, Tex.

A. Flores

I.B.M., Office Products Division, Austin, Tex.

J. Energy Resour. Technol 103(1), 106-108 (Mar 01, 1981) (3 pages) doi:10.1115/1.3230806 History: Received November 19, 1979; Revised December 01, 1980; Online October 22, 2009

Abstract

This paper presents an analysis of the problem of reorientation of a riser pipe from an initially horizontal configuration during subsurface tow to the vertical position for installation. Front and rear barges support the pipe through cables. The orientation into a vertical configuration is accomplished by paying out the front cable. The pipe is treated as a Bernoulli-Euler beam with significant tension undergoing large angle deflections. A finite element procedure used state transfer matrices and successive linearization and the results show that the stress critical phase occurs when the pipe is going through the 60-deg angle to the horizontal direction.

Copyright © 1981 by ASME
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