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Dutch dredging operation avoids unexploded ordnance

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Damen DOP submersible dredge pumps are being used by Dutch contractor Martens & Van Oord in Cadzand, the Netherlands in an operation involving unexploded Second World War ordnance.

The Cadzand old marina entrance needed to be updated and the harbour was to be deepened, but Second World War explosives were known to be hidden in the seabed. Martens & Van Oord used a DOP submersible dredge pump attached to one of their pontoon-based excavators. The DOP pumped the bottom material – sand and occasionally UXOs – to a reinforced screening installation. From there, another Damen pump was used to bring the screened sand further to replenish the nearby shores.

For sand mining purposes, a customised sand mining head with plenty of jetwater was fitted. This DOP head was designed for mining a maximum concentration using pressurised water to fluidise the bottom material.

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