choose one

From 1 January, 2015 new EU legislation came into effect limiting the sulphur content of the fuel used by shipping lines operating within SECA - the Sulphur Emissions Control Areas of the North Sea, Baltic Sea and the English Channel. The current maximum sulphur limit is reduced from 1 % to 0.1 %. Sulphur emissions are toxic, causing acid rain and respiratory complications. The new limits will result in a 90 % reduction in sulphur emissions leading to significantly positive environmental and health benefits.

Shipping Lines compliance to the directive can be achieved through several solutions, including changing to low sulphur Marine Gas Oil (Approx. 50% more expensive than heavy fuel oil); installing purification systems eg. scrubbers to remove sulphur from vessel exhaust gasses; investment in new vessels running on alternative fuels.

By the end of May 2015, Remontowa have installed scrubber systems on 30 vessels of various owners and types (car and passenger ferries, cargo ro-ro's, gas tankers, multipurpose cargo vessels, etc.).

Danish owner DFDS Seaways is investing over EUR 100 million in installation of scrubber systems on 21 of its cargo ro-ro's. So far 15 of them have the systems already installed. Most of these ships received their scrubber installations in Gdansk, at Remontowa.

No scrubber installation job is the same. Even if the same system is used, the installation differs from one ship to another.

Remontowa has gained experience in installation of scrubber systems of various designs from various manufacturers, such as EcoSpray, Alfa Laval, AEC Maritime or Wartsila.

Installation of the scrubber is not limited to placing an actual scrubber into (usually modified) funnel stack. There are many related works, partial modification to some structures on the ship and installation of new accompanying systems.

Recently yet another DFDS Seaways ro-ro with scrubber in its modified funnel left Gdansk based yard, namely Ark Germania (196.3 m long, 34.2 m wide, drafting 5.5 m and featuring 12 000 ton deadweight capacity, built in 2004 at German yard PS Werften Stralsund).

The scrubber system on Ark Germania was installed in line with similar engineering design as done previously on a sister vessel - Ark Dania (in March 2015). On the latter vessel also new tanks and sea chests.

Both ships are designed and built to conform NATO requirements, to cope with possible transport of military equipment, mainly various military vehicles among tasks. When not hired by German or Danish military, the ships are trading commercially.

The scopes of repair works on both vessels have been roughly similar. They included shaft line measurements and rudders, replacement of stern shaft seal, minor repairs to stern ramps (which are designed with segments, so as the ship and its stern ramp may fit to both wider and more narrow shore ramps).

Since May 2015, Ark Germania, with a scrubber installed at Remontowa, operates on the Esbjerg - Immingham route (six loops weekly). For Ark Germania and Ark Dania the supplier of scrubber systems chosen by the owner is ME Production / Marine Exhaust Technology.

In their scrubber SOx is washed out of the exhaust gas by injecting sodium hydroxide as the reacting agent in the process water. In the scrubber unit SOx is washed out of the exhaust gas by the process water. The scrubber unit design is always customised according to the individual vessel and the available space on board.

Sodium Carbonate is injected in the process water as the reacting agent to remove SOx in the exhaust gas. The Na2CO3 agent is supplied from the dosing unit.

The supply of process water for the scrubber unit is taken from the process tank. The process water is also returned to this tank. Fresh water is added continuously and wastewater is taken out for wastewater treatment.

The cooling system is based on seawater being pumped in to a heat exchanger and from there back to the sea in a closed system without any connection to the internal process water flows. The process water is continuously being cooled for an optimised scrubbing process.

Wastewater from the process tank is being treated to separate sludge content and waste water. Sludge content is sent to the ship’s normal sludge tank and waste water is then again cleaned to a quality level that allows discharge of most of the water. The rest of the waste water is sent to a holding tank for disposal in port.

There have been as many as 40 scrubber systems contracted for installation at Remontowa in the course of the years 2014-2015. At least 14 further vessels were confirmed and expected to enter the shipyard for scrubber installation while a dozen or so were negotiated.

Copyright 2005 Remontowa