Wallenius Marine installs Whiteboxes to monitor and control condense water discharge.

Wallenius Marine is one of the greenest shipping companies in the vehicle carrier segment. The company has been the front runner for many years and were ahead with a 5 PPM bilge water discharge limit, ballast water treatment unit installations and continuous effort to lower Sulphur and CO2 emissions.

One of their recent efforts is to lower the amount of fuel oil to limit their environmental footprint even further. The fuel oil consumption can be lowered by reducing the LT cooling water temperature but this will result in more condensed water production in the main engine air cooler. The condensed water is normally very clean water and can be discharged overboard but oil can be present if something goes wrong. Drain water from the main engine air cooler is lead to a separate tank and discharged through a separate Marinfloc Whitebox to manage this risk. If oil is present the water is directed by the three way valve inside the Whitebox to the bilge water holding tank for treatment by the 5 PPM bilge water separator through a second Whitebox. If clean water is mixed with dirty water it will increase the amount of water that needs to be treated. The data from both Whiteboxes are recorded in a common recorder in the engine control room. The amount of condensed water is between 10-20 m3 per day depending on humidity condition for a Wallenius Marine vessel, so the condensed water Whitebox concept has significantly reduced the daily bilge water production and lowering the cooling water temperature has been effective in reducing the fuel oil consumption.

-”We have had Whiteboxes in the fleet for a very long time but the separate Whitebox dedicated for the condensed water is a new concept for us and it feels good to have both the bilge water and condense water discharge data securely logged so we can present our compliance and also our environmental efforts” says Andreas Fridh at Wallennius Wilhemsen.