Kvaerner wins deal for anti-flood door

PUBLISHED : Wednesday, 08 February, 1995, 12:00am
UPDATED : Wednesday, 08 February, 1995, 12:00am

KVAERNER Ships Equipment of Gothenburg, the cargo access equipment specialists and part of Norway's Kvaerner Ships Equipment Group, has secured the contract to design and supply a prototype main deck flood prevention door for the world's largest passenger ferry.

The 59,914 gross registered tonne (GRT) Silja Europa operates on the Turku (Finland) - Stockholm (Sweden) run.

The order has been placed by Silja Line ahead of anticipated regulation by Nordic Maritime Authorities to reduce the possibility of water on the main deck causing a ro-ro to capsize.

The aim of a flood prevention door is to limit the extent of the flooded area, and the subsequent free surface effect, in the event of an accident. At the same time it will not obstruct vehicle deck access during cargo handling operations.

Being less than one metre wide when fully opened, the flood prevention doors result in a minimal loss of cargo capacity.

Initially, Silja will gain operation experience with this prototype door. It will be installed on the main deck port side alone and will not by itself be able to provide full watertight integrity.

Following trials of the system, it is anticipated Silja will then retrofit the ferry with three more doors to seal off the main deck either side of the centre casing both forward and aft.

This contract is the first Kvaerner Ships Equipment has secured for this type of flood prevention door and marks a major breakthrough in the attitude of shipowners to this concept.

In all, it is estimated that at least 50 Baltic ferries will require this type of modification if new regulations are implemented for sub-compartment division on the main deck.

The hemicyclic prototype door is hinged at the ship's side and can swing through a 180 degree arc by means of direct acting cylinders.

To free the lower watertight packing seal, the door must first be lifted 100 millimetres before it can be swung either forward or aft depending on the loading-discharge cycle, to stow against the ship's side.