Discharge systems

A trailing suction hopper dredger represents a major capital investment. Production time must be maximized while costs are minimized. A key part of the production time is the discharge process. DTC offers several types of discharge systems for quick and efficient soil discharge. 

Bottom discharge equipment

The key function of bottom discharge systems is to allow rapid and complete discharge of soil via the hopper bottom while offering reliable operation and a perfect bottom seal. The two main types of bottom discharge systems are bottom doors and conical bottom valves. They are an integral part of the hopper design, normally installed during the building stage, but also available as a retrofit. Their reliability, efficiency and durability are important factors in  increasing the productivity of the dredging cycle. 

Bow discharge equipment

An effective way of increasing dredger productivity and functionality is by installing a fixed means of transporting dredged soil from a hopper dredger to its final location – exactly where it is needed – without the need for an additional vessel. The process typically requires a floating pipeline from ship to shore, powerful pumping capacity and a special link between pipeline and vessel: the bow coupling. IHC America bow couplings offer the opportunity to reduce the time lost between the different phases of the dredging process, increasing dredger performance . 

Another functionality of bow discharge equipment is rainbowing for direct controlled discharge to the shore without floating lines. The rainbow nozzle is part of the bow coupling installation.

Overflow systems

Overflow systems are designed to optimize the efficiency of the dredging process by ensuring the maximum retention of solids in the hopper. With the solids component of the dredged slurry sinking to the hopper bottom and the water draining overboard through the overflow, the overflow system must optimally boost separation of solids and water. It does this by reducing the turbulence of the mixture and giving the solids sufficient  time to settle. It must also be able to naturally handle the volume of dredged materials. Designed with the needs of a specific vessel in mind, IHC America hopper overflow systems can significantly increase the level of net production.