McDermott Completes Twin Drilling Rig Ordered By Helmerich & Payne International

McDermott Shipyards recently completed a specialized, twin-packaged drilling rig (shown above) for Helmerich & Payne International Drilling Company, for contract use on Texaco's Harvest "A" platform in the Santa Maria Basin, Calif. The rig was disassembled at McDermott's New Iberia, La., yard and shipped to the West Coast by rail.

The ability to disassemble the rig in packages small enough to ship by rail represents an advantage for the owner and adds a flexibility lacking in typical modular rig packages.

McDermott project engineer Bob Wilson explains: "As the rigs can be broken down into smaller components than conventional modules, they can be shipped by rail or truck. The smaller packages can be handled without the heavy equipment modules require; the ordinary lifting equipment available on platforms can handle these packages. On the other hand, if using heavy-lift equipment is desirable, these packages can be consolidated to make full use of the lift capacity available.

"These factors cut down on the expenses of specialized handling equipment and reliance on the availability of specialized equipment. We believe that these advantages will prove to be of increasing value to Helmerich & Payne." The complete rig can be assembled with approximately 50 lifts using platform-mounted material-handling cranes to lift packages of 40 tons or less, and in approximately 10 lifts, depending upon completeness of package assembly, using a derrick barge to lift packages up to 500 tons.

The twin-rig unit was designed by McDermott's Hudson Engineering subsidiary's Lafayette, La., office The complete structure, which weighs approximately 1,000 tons, is designed to meet criteria for the Zone 4 seismic area and 100-year storm, as defined by API RP2A. Subassemblies are equipped with individual lifting eyes, and are bolted together using more than 3,000 bolts made of steel meeting these seismic and storm requirements.

Maritime Reporter Magazine, page 41,  Sep 1985

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