VESSEL REVIEW: Scald – Impressive freighter to TSHD conversion

The Netherlands’ Goes-Faasse Groep has just taken delivery of the trailing suction hopper dredger (TSHD) Scald.

The Scald features unlimited sailing area, shallow draught and special manoeuvring qualities by using four rudder propellers and a liftable wheelhouse. 

Scald was built from the seagoing freighter Futura Carrier, which was designed for fuel efficiency and a low environmental impact. This ship was shortened by 20 metres at Scheepswerf Reimerswaal, and then Scheepswerf Kooiman in Zwijndrecht executed the conversion to a maintenance-friendly TSHD.

The 79.99- by 14.10-metre Scald now boasts a hopper capacity of 1,800m³, and a totally new and liftable wheelhouse, resulting in innovative possibilities for dredging, sieving and unloading activities.

During the conversion, various preparations were made to facilitate future expansion. A simple expansion can be made by rainbow bow and/or lateral couplings and spod poles. The design emphasis was to innovate the dredging and sandwinning possibilities and to combine activities.

The conversion was executed using stainless steel and a minimum of frames and corrosion sensitive parts on deck. The dredge pipe wire winches have been placed on the lower deck. The bottom doors have been provided with levers instead of chains and cylinders.

The complete equipped wheelhouse creates a perfect activity overview. A single person can operate the navigation, dredging and winning processes.

The mobile dump gutter with sieve can be moved over the total length of the hopper to improve the spreading of the cargo. The sieving capacity is designed for more specific sieving.

The unloading system runs all around the vessel. By using the mobile dump-/sieve gutter, sufficient space will occur to unload dry sand. The ship is also equipped with a sand transfer unload installation for loading barges. A powerful jet pump directs the material within the hopper. These jets can also provide desalinisation of the sea sand by adding sweet water.

The six bottom doors provide sand dumping in specific places. The unloading system is expandable by connecting the dredging pump with the booster pump, in order to use full spray capacity or stowing by using a shore discharge pipe.

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