Trans RINA, Vol 152, Part A4, Intl J Maritime Eng, Oct-Dec 2010


bulkhead at frame #25 in order to allow flooding to the store room in the forward compartment. The general arrangement is presented in Figure. 3. Photos of the rooms and openings are shown in Figure. 4 and 5, respectively.


In the numerical model the large tanks in the pump room were taken into account as separate rooms. This ensured that the permeability in this room is properly divided also in the transverse and longitudinal directions. The anti- sloshing bulkheads in the side tanks (Figure. 4a) were included in the numerical model of the ship and each manhole was modelled as a separate opening.


The “damaged” side tank was equipped with two air pipes (diameters 65 mm and 100 mm). This allowed also tests with notable air compression. The other rooms were practically fully ventilated through large openings in the tween deck and ventilation ducts.


Table 1: Main dimensions of the ship Length over all:


Maximum breadth:


45 m 8.8 m


Displacement: 221 ton Metacentric height: 1.10 m


Figure 2: Butterfly valve used as a damage hole


Figure 1: Fast Attack Craft Turku (photo credit: Finnish Defence Forces)


Figure 3: General arrangement of the flooded compartments.


Figure 4: Flooded compartments: a) side tank with anti-sloshing bulkhead, b) equipment room and c) pump room A-198 ©2010: The Royal Institution of Naval Architects


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