"V" Jet System
AGR Subsea Limited owns and operates a series of "V" Jet Trench Profiling and Excavation Systems. "V" Jet systems are designed for use with the SeaVator 150 hydrodynamic excavator to improve trenching speed and excavation performance in cohesive and compacted soils.
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The SeaVator and "V" Jet Equipment can be used to dig trenches up to 5.0m deep in single or multiple passes in suitable soils. Each System consists of a pumping spread with water suction riser, hose reel and umbilicals, SeaVator manifold and jetting pipe assemblies and a range of jetting nozzels to suit different soil strengths and seabed conditions.
Three jetting configurations are available, Mono-Jet, Dual "V" Jet and Multi "V" Jet systems. Three power levels, 600, 1200, and 5000hp are availbale to allow operations in the wildest possible range of activities. The standard 600hp Dual "V" Jet system is designed to suit most trenching applications in sand and weak clay soils up to 25kPa and pipeline diameters in the range 0.25 to 1.0m. Single pass trench depth can be varied between 0.25 and 2.0m
The 1200hpsystem is available for intermediate sized pipeline trenching operations with pipeline diameters up to 1.2m and 3.0m trench depth. The 5000hp high pressure, high flow system is designed for pipeline diameters over 1.2m and or where trenches are required in high strength clay soils up to 150kPa. Where it is important to restrict the depth of cut per pass to 0.5m or less, the multi "V" Jet system is normally specified.
Where it is difficult to recover redundant objects such as concrete weights and pipeline supports or environmentally safe debris (due for instance to awkward shape, lack of lift points or poor condition) sub mud line burial may be an appropriate method of disposal. The Mono-jet system (a single central vertical jet mounted under the SeaVator) is suitable for fluidising the seabed locally, allowing objects to sink below seabed level.
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