Ship propeller inland waterway tanker business case

^{By: Jeroen Berger, July 6, 2017}

Two new inland waterway tankers for B. Dettmer Reederei GmbH & Co. KG are delivered recently. It is about the Dettmer Tank 120 and Dettmer Tank 122. Gebr. De Jonge Shipbuilding Service B.V. has built the two cascos in Kladovo (Serbia) and let it phasing out by Breko in the Netherlands under supervision. The inland waterway vessels had to have an environmentally friendly character. We from Berger Maritiem found it a challenge to design and deliver CFD optimized ship propellers for these inland waterway tankers.

About B. Dettmer Reederei GmbH & Co. KG

The company was established in 1947 with a business in coffee. At that time ships were also built. The shipping company grew out to 120 ships in total. Nowadays the organization consists of 30 mineral, lubricating oil and sulphur tankers. It is the ambition of B. Dettmer Reederei to renew and increase her existing fleet.

About the Dettmer Tank 120 and Dettmer Tank 122

Gebr. De Jonge had built the 86 by 9,5 meter cascos on their own shipyard Shipyard Kladovo in Kladovo (Serbia), at the Danube. The inland waterway tankers have a different model and have a large load capacity. For the components from Dettmer’s vessels the ‘De Jonge ECO-NOMY’ concept is used. The accent of the inland waterway tankers lies on a combination of load capacity – kanalfähig – and speed with a minimum of fuel consumption.

What have we delivered and what was our approach?

For the two new inland waterway tankers Dettmer Tank 120 and Dettmer Tank 122 we have designed and delivered four CFD optimized ship propellers in total. With the use of advanced computational fluid dynamics (CFD) software we were able to have clear the hydrodynamic properties of the vessels. On that base we came to an efficient ship propeller matching the ship’s shape and the chosen sailing profile.

What was the result?

During the sea trials there is shown that in terms of speed, fuel consumption, noise and vibration the expectations with the CFD optimized ship propellers have been exceeded.

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