Marine Rotary Hoe

Maximize diver bottom time.

A new tool to our product range soon to undergo sub sea evaluation, designed specifically for dredging in difficult soils that may be hard or very 'sticky' where water jetting has up till now been the only option.

The principle here is to mechanically break up the soil composition and fluidize it in the same motion so it can be sucked away through the mouth of the tool. This tool retrofits to the suction inlet hose of our existing 3, 4 and 6 inch dredges with simple cam locks and adapter as shown.

Deep Sea Rotary Hoe Specifications

Weight = 23 kg
Hydraulic supply = 20 lpm (5gpm) and 103 bar (1500psi)
Tyne rotation = 250 RPM
Rotational torque = 30 ft/lb (40Nm)
150mm (6 inch) internal diameter
Bi-directional rotation
Officially tested on land in AP 40 crushed aggregate (rocks and sand) at 100 to 150kPa
Officially tested on land in volcanic ash / clay soils at 90 kPa
Self clearing tynes
Self adjusting linkages
Environmentally friendly bearings - no oil.
Will be supplied as standalone tool with hydraulic hoses, pressure reducing cross port relief valve, cam lock adapter to suit host dredge system and ROV handle.

Marine Rotary Hoe Info Download Manual

Dredging in action

We offer a wide range of dredging solutions to suit most deep sea applications. The below graph shows our current selection of dredge solutions from the Electric 2 1/2 inch, to the larger BLACK HOLE 8 inch dredge.

We can also tailor a dredge solution to specifically suit your hydraulic supply if by chance your requirements are not covered by our extensive range. If you require a custom dredging solution please contact us directly.

Tornado 4" Dredge MkII

With a proven suction inlet vacuum up to 29.5in/hg (100kpa), the patented Vortex 4" T-100 Tornado Dredge is designed for subsea excavation and disposal of seabed materials up to 99mm in size.

Vortex 4" Dredge Pump

The most powerful 4" ROV and diver dredge in the world at 97kpa (28in/hg) vacuum has removal rate performance more commonly seen in 6-inch dredges.

Hurricane 6" Dredge

With a suction inlet vacuum up to 15.3in/hg (52kpa), the patented Vortex 6" Hurricane Dredge is designed for subsea excavation and disposal of seabed materials up to 149mm in size.

Why is Vortex Dredge Superior to other ROV Units?

Vortex dredges have been designed to combine high suction values and high water volumes to tear up sticky soils with very high suction then keep it flowing with high water volume. Powerful, simple, effective.

Example: Getting a "RIDICULOUSLY THICK MILKSHAKE" ® ™ to move through a straw is similar to dredging a very sticky seabed and suction is key because if you drive a suction hose deep into sticky mud the water flow in the suction hose will often stall and the hose is essentially filled with a 'plug' of mud and only high suction will clear the hose. Once the hose is clear then water flow takes over.
Suction does the work and water flow continues the work done.

VORTEX performance figures DO NOT have a small print clause with an Asterix symbol next to figures which would represent "best case Scenario" removal rates as opposed to actual removal rates.

VORTEX removal rates are ACTUAL removal rates as seen with actual material moved using Magnetite black iron sand and rocks weighing 2.375kg per liter as to the sample product.