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Project: s.s. Catherine

22 april 2014

Project: s.s. CatherineProject s.s. Catherine was recently delivered, followed by its maiden voyage. This beautiful river cruise ship was built at the shipyard of Gerlien van Tiem in Druten.

Discom designed and implemented an intelligent water cooled exhaust system for s.s. Catherine, whereby high levels of passenger comfort enjoyed top priority during the design phase. In collaboration with VDE Marine, electronic regulation was designed and delivered for complex, intelligent regulation of the exhaust systems.


The exhaust system starts with a very effective silencer, which generates 50 dB (A) damping due to the specially tuned internal parts. A major plus for comfort levels is the integrated oxidation catalyst in the damper. This catalyst significantly reduces hydrocarbon levels, which produce an unpleasant odour and carbon monoxide, which is a poisonous gas that is undesirable on a cruise ship.

Behind the muffler, exhaust gas is passed through a cooling section where the exhaust gas is cooled with injected river water to temperatures that ensure that when moored the exhaust gas does not rise quickly to the level of the sun deck, whilst also ensuring that the gas is vented below the water level while sailing. Before the exhaust gas is vented underwater or through the transom it is separated from the water to avoid unwanted noise levels caused by falling water.

An intelligent electronic system has been developed in collaboration with VDE Marine for underwater discharge regulation. This system controls which certified valves are to be open at any time. This is controlled with the input of the ship, e.g. speed and immersion level, but it is also based on continuous counter-pressure measured in the exhaust system and the temperature of the exhaust gas. The system is configured so that it can discharge underwater, both at the minimum immersion level and at the maximum immersion level.

Significant redundancy present in the control system is that each engine room has access to a local operating panel (LOP), which are connected by a fibre-optic cable to ensure that all systems can be read at any location. Any error messages are sent directly to the bridge by the control system as an alarm.

By applying knowledge of noise emission and heat, Discom created a custom-made exhaust system which perfectly matches customer needs with regards to comfort.

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