Top tensioned risers (TTRs) are a key component in Dry Tree Tension Leg Platform (TLP) systems. TTRs are used for both production and drilling operations.

The operability of the drilling riser system can be a key factor in the project economics. In addition to the in-place operability, maximizing the weather windows for running and retrieval of the drilling riser system minimizes down time and increases operational flexibility.

This paper presents the approach taken to determine drilling riser installation envelopes. It discusses the solutions evaluated for increasing drilling riser installation envelopes and documents the associated equipment selection and specification.

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