MOTION RESPONSES FOR DRY TOW OF TRIDENT IV

Project Summary

The Transocean owned jack-up rig TRIDENT IV was dry towed from Angola to the Zadar Yard in Croatia on the semi-submersible

cargo barge ZHONG REN 3. The rig carried legs with a length of 125 m (410 ft) each. An independent barge motion response

analysis demonstrated that the design accelerations resulted in leg bending moments which were still within the maximum allowable

moments. After a successful loading and seafastening operation, the barge departed Angola on May 24, 2004.

The project scope included:

Photographs courtesy of Hydrographic and Marine Consultants BV.

specialists in marine heavy-lift transportation engineering

naval architects

marine surveyors

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Est. 1992

■	Provide design environmental criteria for the tow route;
■	Calculate design barge motions and accelerations;
■	Calculate design linear point accelerations at various levels above deck.

Barge ZHONG REN 3 departing with jack-up rig TRIDENT IV on deck