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Structures

TAP-609-Reliability vs. Consequence of Failure for API RP2A Platforms Using RP2MET

Energo examined the structural reliability of a set of approximately 15 GOM platforms of different configurations, water depths and locations. This set was meant to represent a typical cross section of the GOM fleet of fixed platforms. The resulting platform reliabilities were compared based upon metocean criteria used - RP2A or 2INT-MET and by region. The results will allow MMS to better understand the impact of the new API criteria on expected platform performance according to design approach used and location in the GOM.

TAP-605-Cooperative Research on Extreme Seas and their Impact to Floating Structures

In the offshore and shipping industry, extreme wave events have led to extensive damage and destruction of offshore structures. Hurricanes Ivan, Rita, Katrina, Gustav and Ike that hit the Gulf of Mexico and severe storm events experienced in the North Sea illustrate the importance of extreme wave design for all types of offshore structures. As the U.S. grows increasingly dependent on the steady supply of energy from federal offshore oil and gas reserves, BOEMRE remains attentive to new technologies that safeguard offshore energy facilities, their personnel, and the environment.

TAP-604-Evaluation of Fatigue Life Models and Assessment Practice for Tension Leg Platforms (Phase 1: Tendon System Fatigue)

The objective of this project is to evaluate the state of practice in fatigue assessment in the offshore industry today. Of interest is an understanding of how fatigue life calculations are undertaken and how both load and resistance side uncertainties are employed in design for fatigue.

This objective will be accomplished via the following tasks:

TAP-597-Assessment of Superstructure Ice Protection As Applied to Offshore Oil Operations Safety

The objective of this research project is to assess potential methods for improving safety on drilling and production vessels and platforms operating in the Chukchi and Beaufort Seas and experiencing superstructure icing. The goals are: To identify ice protection technologies currently in use on marine structures, evaluate their effectiveness for enhancing operational safety and define critical superstructure icing needs.

TAP-596-Sea Spray Icing of Drilling and Production Platforms

The objective of this research project is to develop methods for quantifying the occurrence and severity of sea spray icing on oil exploration and drill rigs in the Chukchi and Beaufort Seas. The goal is to provide algorithms for processing weather data to determine sea spray icing severity on offshore structures.

The project deliverables are:

Task 1. Summary of spray icing data sets

Task 2. Interim report on calculations using Cook Inlet weather data

Task 3. Interim report on spray icing events

TAP-591-Evaluate Accuracy of Polyester Subrope Damage Detection Performed by ROVs Following Hurricanes and Other Events

This project investigated the accuracy of non-invasive deepwater subsea inspections performed by common ROV-supported inspection tools and provided a comprehensive assessment of the knowledge gained from recent work on subrope behavior.

The objectives were:

TAP-584-Arctic Offshore Technology Assessment of Exploration and Production Options for Cold Regions of the US Outer Continental Shelf

A number of cold region offshore developments have been carried out or are planned worldwide, including Sakhalin Island (Russia), Kashagan (Caspian), Shtokman (Barents Sea) as well as in the Beaufort Sea (Northstar, PanArctic Drake). An understanding of these analogue projects, as well as those already operational or planned for the United States (e.g., Northstar and Oooguruk), will provide insight and guidance into potential exploration and development technologies that might be applied to cold regions of the Outer Continental Shelf.

TAP-578-Assessment of Fixed Offshore Platform Performance in Hurricanes Katrina and Rita

The objective of this effort was to conduct a qualitative and quantitative assessment of fixed offshore platforms that were affected by Hurricane Katrina and/or Rita. Resulting data was evaluated to determine if any common trends occurred, and also to determine if current API standards are an accurate indicator of expected performance. Coordination and consultation with the API HEAT group occurred throughout the project.

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