J. Ray Mcdermott & Co., Inc.

Robert L Olsen

Nico DEBoer

An apparatus for entrenching submerged elongate structures, such as a pipeline, within the bed of a body of water. A spreader frame straddles the pipeline to be entrenched. Port and starboard sled frame members having pontoons are pivoted in the spreader frame on each side of the pipeline for pivotal movement. Each sled frame member carries a fluid jetting leg which includes jetting nozzles. Hydraulically operated linkage moves the sled frame members causing the jetting legs to substantially enclose the pipeline bringing the ends of the fluid jetting legs into close proximity beneath the pipeline. Jetting action by the nozzles forms a trench in the bed for receiving the pipeline. The fluid jetting legs are adjustable for various depths and for various sizes of pipeline. The combined structure formed by a sled frame member and fluid jetting leg has a center of gravity that is inboard of its pivot point causing the jetting legs to move apart upon the apparatus being urged off the submerged floor such that the jetting sled does not engage or tangle the pipeline.

Growing community of inventors

New Orleans, LA, United States of America

Robert L Olsen