DOP Submersible dredge pumps

Centuries old siltation problem tackled with DOP Submersible Dredge Pump


Location: Port of Durban, South Africa

Period : 2014/2015

Product type : DOP350L with sand production head

Contractor : T&T Marine for Transnet National Ports Authority

Excavator-mounted DOP mines sand and replenished beach at the same time

Littoral drifts of sand continually threaten to block the harbour entrance of Durban, South Africa’s key port. Moreover, at the southern side of the breakwater sand accumulates, and at the northern side sand is eroded. In depth studies have now resulted in a permanent solution, called the sand by-pass. During its construction, the DOP was the temporary solution.

The DOP where its belongs Under Water

The DOP dredge pump 350L was hung in a Liebherr 1100 crane, and ran on a separate power pack. At a dredging depth of max 3 m, it mined some 700 tons of fine beach sand per hour, totaling at 300,000 tons for the project. The DOP pumped the sand over 250 m to a booster station, thus replenishing the eroded beach.

The DOP350L being a dredging tool with a short mobilization and demobilization time, was perfectly fit for the job. Its compact size meant that it could be maneuvered by a locally available excavator.

The DOP350L was hung in a Liebherr 1100 crane, and ran on a separate power pack.