SDM at Hopper Dredger

Measuring Task

Determination of sludge density behind the suction pump.

  • Hopper capacity: 950 m³

  • Pipe diameter: 508 mm (20 inch)
  • Pipe material: Steel
  • Solids: 10 – 35 wt%
  • Density: 1 – 1.4 ton/m³
  • Temperature: 5°C – 25°C (41°F – 77°F)


Beens Dredging got the assignment to remove a certain amount of sludge from the port in Amsterdam to ensure a safe passage for ships. The operator of the ship wants to fill the hopper with sand as quickly as possible to reduce the total time spent on this project. A density meter was needed to monitor the real-time density of the sludge.

Instrument used


The SDM is a good solution for this measuring task, because of its reliable, stable and real-time measurement results. The instrument uses non-nuclear technology, so there are no additional safety costs or governmental restrictions.

The density meter is used in combination with a flow meter to determine the optimal dredging condition. The density and flow rate are both shown at a (digital) cross meter in the wheelhouse. This cross meter helps the operator to execute a dredging session more efficiently, resulting in a reduction of the total project time and accordingly also the costs.


The SDM contributes to:

  • Real-time density monitoring

  • Determination of the optimal dredging condition
  • Efficient completion of the dredging session
  • Reduction of time and money spent on a project
  • Quicker response to changing process conditions
  • Avoiding pump obstructions

You can read the whole story about the success of Beens Dredging in the case study. Click on the image below to download it.

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