Sand shield jet sled

Details Sand shield jet sled Sand shield jet sled

E - Fixed Constructions

02

F

61/5.5

E02F 5/02 (2006.01) E02F 5/10 (2006.01)

Patent

CA 1041310

SAND SHIELD JET SLED ABSTRACT An apparatus for burying a pipeline in a seabed com- prising unconsolidated materials such as sand. The appa- ratus includes a jet sled having jetting legs for disposi- tion on opposite sides of the pipeline to direct a stream of high pressure water into the seabed to form a trench for the pipeline, and an elongate member extending rearwardly of the jet sled having shields depending therefrom to physically restrain the walls of the trench from caving-in and filling the trench beneath the unsupported portion of the pipeline. In addition, fluid jet nozzels are carried along each of the shields providing a mild turbulence at the lower edge of the shields to assist in keeping sand out of the trench and maintain the bottom of the trench in a fluidized condition. The elongate member comprises a pair of ballast tanks which may be selectively ballasted or deballasted to raise and lower the sand jet sled apparatus within the water, and to assist the settling of the pipeline into the seabed.

275532

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