Barnacles in the main seawater inlet of "MV Waterway" from Boskalis
Company: Royal Boskalis Westminster, Netherlands
About the customer:
Royal Boskalis Westminster is a more then 100 year old company from the Netherlands. Boskalis is a leading global service provider for maritime infrastructure, they own more than 1100 vessels for this purpose. The MV "Waterway" is a so called trailing suction hopper dredger.
In general dredgers are used to remove material from the seabed and so clean channels and harbours, or for land reclamation or coastline fortification. One of the well known projects has been the artificial Palm Islands in Dubai, UAE or the extension of the harbour in Rotterdam.
Most vessels need seawater on board. This seawater is used for cooling the engine, for jet water, to produce drinking water as well as technical water in a fresh water generator, or for the pressurized water systems (hydrofoor) to supply the drinking water taps and the showers on board. This seawater is pumped inside the vessel from the so called sea chest, below the water line. When taking in seawater all kind of marine growth is coming along with the seawater. This marine life is kept outside by a filtering device, but the pipe which takes in the seawater gets over a period of a year totally chocked up with barnacles and seashells. Even more so as the "MV Waterway", at the moment dredging along the African Atlantic coast and thus sailing under hardest conditions when it comes to marine growth. So it is normal procedure on most vessels to clean this pipe at least once a year. In a vessel like a dredger, this problem might be even bigger, as dredgers are operating near the shore line or inside a harbour, where the water is warmer and the conditions to grow for marine life are better then when sailing the open sea. As this pipe is directly connected to the open sea, the cleaning can also be done only from outside. This means the vessel has to be either in a drydock or divers have to be used when cleaning this pipe section.
A vessel like the "MV Waterway" needs a lot of water, so the pipe is a 24" line. In order that Merus is able to have effect on most of the pipe, the installation should be done as far as possible upstream, or in other words as near as possible to the entrance of the water into the vessel. As there is limited space, the installation of the Merus Ring, especially one of this size, has been a special technical challenge, but was finally successfully managed.