RudderPropellers for Frederick Paup

At the end of 2022, the largest US-flagged, self-propelled trailing suction hopper dredger (THSD) Frederick Paup has been propelled by three Schottel RudderPropellers manufactured at the German Wismar production site. A look inside the assembly shop gives an idea of the special dimensions of these thrusters.

The three Schottel RudderPropellers type 510 L FP are powered by diesel-electric drives and feature propeller diameters of 2.8m and a power intake of 2,240kW each. A particularly long propeller arm length allows for an arrangement at the stern in portside, centre and starboard position with convenient access for future maintenance.

The 360-degree-steerable SRPs will enable the Frederick Paup to always benefit from maximum manoeuvrability, outstanding course stability during free sailing, and powerful thrust in the chosen direction.

Besides the nozzles featuring enhanced corrosion protection with ProAnode, the RudderPropellers will be equipped with the DNV-GL type-approved Schottel LeaCon sealing system. Considered a non-oil-to-water interface, the system complies with the VGP regulations of the

The dredger will be owned and operated by Manson Construction and is currently under construction at the Keppel AmFELSShipyard in Brownsville, Texas. It will be 128m in length, have a 25m breadth and about 9m draught and will have a hopper volume of 11,500m3. The vessel will represent Manson’s single biggest investment in its 117-year history.

The vessel is scheduled to enter operation in 2023 and will support the US Army Corps of Engineers in maintaining marine transportation highways primarily along the Gulf Coast and Atlantic Coast, as well as throughout the country.

A steel cutting ceremony for Frederick Paup had already taken place in April of 2021. While Project Manager Jordan Brown used a torch to cut the steel tab on the ceremonial plaque, Manson VP and Equipment Manager Brad Martin pressed the start button on the Plasma Cutter with Keppel AmFELS President, Mohamed Sahlan Bin Salleh.

MacGregor, part of Cargotec, delivered two 36.6m double telescopic service cranes and one 15.24m telescopic stores crane for the vessel. The cranes were built at MacGregor’s facility in Seattle, Washington, and were planned to be delivered to the shipyard by the end of 2021, with commissioning and testing during 2022 prior to delivery of the dredger in spring 2023.

The larger service cranes are double telescopic cranes with a size of 24.4m length when stored and extend out to 36.6m. The Safe Working Load (SWL) for these cranes will be circa 1,769kg at 36.6m and 4,899kg at minimum reach. The aft stores crane is a single telescopic crane with a size of 9.75m length when stored that extends out to 15.24m. This versatile model has been installed on a diverse range of vessels in recent years, including a number of fishing vessels in the US Pacific Northwest. MacGregor worked with Manson and the designer, Hockema Group of Seattle, during the earlier design stage of the project to provide crane models that fit their requirements and ensure the highest quality.

i. schottel.de