Abstract
ABSTRACT New materials have been developed for high pressure marine risers used in tension leg platform (TLP) applications. Modifications of standard AISI 8630 material provide low alloy steel grades which have good fracture toughness and excellent fatigue properties under high stress conditions, and are readily weldable. Materials and welding procedures are reviewed in light of increased performance demands forTLP applications, and considering design criteria established by the relevant certifying authorities. Work performed on the drilling and export risers for the industry's first (and to date, only) TLP installation is presented, with reference to monitoring and quality control activities involved in fabrication of those systems.
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