DOP Submersible dredge pumps

DOP dredge pump used as MultiTool for UXO ID and clearance campaign

Location: Port of Hamburg, Germany
Period: Q2, 2020
Product type: DOP250 with special head
Owner: Martens en van Oord
DOP dredge pump used as MultiTool for UXO ID and clearance campaign

The main Hamburg navigation channel needed dredging. This sounds simple, but it proved to be a challenge: plenty of objects in the navigation channel needed to be identified and removed before dredging could commence.

Hamburg Port Authority tendered the job with a clear restriction: no human intervention - by for instance divers - during the clear-out.

BALTIC Taucherei- und Bergungsbetrieb Rostock GmbH as subcontractor of Jan de Nul Nassbaggerei und Wasserbau GmbH took up the challenge by using the MultiTool. This MultiTool, designed and built by Martens en Van Oord with input of BALTIC Taucher and Stascheit Kampfmittelräumung GmbH, makes use of a DOP submersible dredge pump.

The heart remained the same – a DOP250 attached to a crane boom – yet the suction head was revolutionised: it can jet away soil using pressurized jet water, it can pump away soil using the DOP- and more.

A build-on survey device can identify bottom debris. Then, the on-board specialist can decide whether it is safe to remove this debris by means of the poly grab mounted on the MultiTool - or mark the object for later removal.

This “grabbing action” is done by the hydraulically-operated poly grab

Both the poly grab and the DOP dredge pump are hydraulically operated. They are mounted onto the boom of a crane, which was located on a large floating sheerleg with 200t heavy lift capacity “Baltic Lift” owned by BALTIC Taucherei- und Bergungsbetrieb Rostock GmbH.

Using this “Swiss army knife”-solution the Hamburg fairway has been cleaned of submersed debris and dredging could commence safely.