Improving the Fatigue Performance of SCRs via a Special Touchdown Zone Pipe Section

Event:
OTC
Date:
May 2017
Author:
R. Thethi, W. Forbes - 2H, G.Mansour - Artifex, P. Hays - Chevron

Abstract
A special section of seamless pipe machined on the inside and outside to have upset ends is used at the touchdown zone of a 20in oil export steel catenary riser (SCR) in order to improve the fatigue life. This paper covers the drivers for the choice of this special section, procurement, management of challenges, and lessons learned. The chain of supply (pipe, machining, coating, welding, and fatigue testing) involved several suppliers across several countries posing another challenge.

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