ROVworld Subsea Information

SMD Hydrovision Deliver 2MW Pipeline Jetter
Date: Sunday, November 05, 2006 @ 06:10:38 EST

SMD Hydrovision Deliver 2MW Pipeline JetterSMD Hydrovision has just completed successful testing of the World’s most powerful subsea trenching machine. The 2MW Pipeline Trencher has been designed and built for the Sea Trucks Group, based in Nigeria. The system was tested in the River Tyne immediately adjacent to where it was manufactured at SMDH’s Turbinia Works.

2MW Pipeline JetterThe machine created quite a splash when it was tested at full power, sending plumes of water 50m from its powerful dredge pumps, as you can see from the picture below. The system is now on its way to Nigeria where it will be used next year.

The contract to build the machine was the result of two year discussions between SMDH, Sea Trucks and their clients (Shell Petroleum Development Company Nigeria and Hyundai Heavy Industries) to find a solution to protect two new pipelines they will install for the Bonny Island Terminal Project. The 36” and 48” lines will be installed and buried between two existing live lines from the beach to offshore. Conventionally, the lines could have been pre-trenched using a cutter suction dredger. However, since the existing lines lie close together, conventional dredging would present a serious risk to these lines, as offshore class dredgers can only prepare large access channels.

The solution developed by SMDH is a powerful self contained jetting and dredging machine, which runs on rollers on top of pipeline. The machine fluidises the soil around and under the pipe and removes it using strong dredge pumps. Hence, only a narrow trench is formed under the pipeline, with the resulting limited impact on the environment.

Operating at full powerThe machine is supported by the pipe and large buoyancy tanks. These can also be lowered by remote control to act as skids in the surf zone. The machine is bi-directional enabling it to make multiple passes between the beach and the support barge without being turned around. The 750m long power umbilical allows it to work at quite a distance from the barge.

The machine will use SMDH’s Distributed VEhicle Control System (DVECS) to precisely monitor and control the trenching process. Power and telemetry will be transmitted via a single armoured umbilical to containerised control and power vans located on the support barge. The umbilical winch is also designed and built by SMD Hydrovision.

The contract is further confirmation of SMDH’s position as the World’s leading manufacturer of subsea trenching equipment for the protection of pipelines and cables.

November 3, 2006

Source: SMD Hydrovision

This article comes from ROVworld Subsea Information

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