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RESEARCH PAPERS

Upper Ball Joint Force Variations due to Riser Tensioner and Vessel Motions—Part I: Derivation of General Equations

[+] Author and Article Information
T. J. Kozik, J. E. Lowell

Department of Mechanical Engineering, Texas A&M University, College Station, TX 77843

A. Ertas

Department of Mechanical Engineering, Texas Tech University, Lubbock, TX 70409

J. Energy Resour. Technol 112(3), 188-199 (Sep 01, 1990) (12 pages) doi:10.1115/1.2905757 History: Received November 02, 1989; Revised July 12, 1990; Online April 16, 2008

Abstract

General equation for the tensioner cable forces and for the forces exerted on the riser upper ball joint by the ship joint-tensioner system are derived. An analysis of the variation of forces acting on the upper ball joint of a riser string due to drill ship motion and riser tensioner dynamic has been conducted. The analysis includes the effect of breakaway torque on the tensioner sheaves while assuming vessel and upper ball joint motion to be independent.

Copyright © 1990 by The American Society of Mechanical Engineers
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