DOP Submersible dredge pumps

A continuous cycle of barges is emptied using the pontoon-based hydraulic offloader


Location: Tampa, Florida, USA

Period: Q2/3, 2017

Product type: DOP450L with sand production head

Contractor: Cashman Dredging & Marine Contracting, LLC

Efficient barge unloading by excavator-mounted DOP 450L

The DOP submersible dredge pump, type DOP450L, has been delivered to the American contractor Cashman Dredging & Marine Contracting, LLC in September 2014. The DOP pump has been fitted out with a reinforced casing and heavy duty suction head making it the perfect tool for unloading barges, or hopper scows as they are also called.

The high efficiency pump has done many jobs since its delivery, throughout the USA, and recently completing one in Puerto Rico.

On its current job in Tampa, FL, the DOP450L was integrated in a recently built hydraulic unloader, called “Kraken”. Here, the submersed dredge pump is attached to a Komatsu hydraulic excavator, type PC1250, which has been customized specifically for the pumping operation.

The excavator is based on a large pontoon, where a continuous of cycle of barges is moored along.

The hopper scows are 5.000 CY (being some 3.800 m3). They are pushed alongside the hydraulic offloader pontoon, where plenty of transport water is added to the cargo. Generally, the material to be pumped is mud and clay from a maintenance dredging project. Some 4.000 m3/h of mixture is pumped 1.100 m to a disposal area using a booster pump and sinker pipe line.

Once this job is completed, the DOP barge unloader “Kraken” has plenty of new jobs lined up throughout the winter ‘17/’18.