Marathon LeTourneau Exhibits Slo-Rol® Motion Suppression Technology During 1985 OTC

Marathon LeTourneau Offshore Company's Slo-Rol® motion suppression system significantly widens the operating window for jackup rigs by making major reductions in roll, pitch and heave motions. It allows jackups to change location during periods of high waves or swells, thus diminishing costly delays while "waiting on weather." Slo-Rol also reduces roll and pitch motions during wet tows in most sea states. This lessens dynamically induced structural loads on legs and supporting structures.

The Slo-Rol motion suppression system eliminates up to 90 percent of roll and pitch motions and up to 40 percent of heave motion. It also reduces leg moment loading by up to 90 percent at initial spud can impact with the sea floor.

Extensive wave tank tests of the Slo-Rol system on a model of a Marathon Gorilla jackup have confirmed the effectiveness of the system in both roll and pitch suppression.

This motion suppression system consists of open-bottom steel tanks installed adjacent to the corners of a jackup drilling rig's triangular hull.

When filled with compressed air, the tanks radically alter roll performance by producing a stabilizing torque that counteracts the wave torque. Since Slo-Rol is a passive tank system, it requires only low power after activation.

Marathon's Slo-Rol system can be easily and economically installed on new-build rigs or retrofitted onto existing units.

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Maritime Reporter Magazine, page 23, Jun 1985

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Maritime Reporter

First published in 1881 Maritime Reporter is the world's largest audited circulation publication serving the global maritime industry.