Watertight door

Watertight door

Emergencies

Published in David House, Seamanship Techniques, 2019

There are many designs of watertight door and watertight hatch, the most common being those closed manually by means of ‘butterfly clips’ or ‘double clips and wedges’ (dogs), which are operable from either side of the door (Figure 14.6). The disadvantage of this type of closure is that it takes considerable time to secure. In an emergency it may even prove impossible to secure against water pressure on one side.

Maritime operational risk management using dynamic barriers

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Journal Information

Published in Ships and Offshore Structures, 2022

Kristian Bertheussen Karolius, George Ad. Psarros, Ole Christian Astrup, Qin Liang, Clayton Van Welter, Dracos Vassalos

The presented risk model has been implemented for demonstration on a large (225,300 GT) modern cruise vessel currently in operation. Main particulars of the sample vessel are summarised in Table 1. The vessel internal compartment connectivity comprises a total of 1088 openings, covering doors, hatches, etc., whereas 63 of these are defined as watertight barrier elements (24 Sliding-watertight doors, 26 Light-watertight doors and 13 Semi-watertight doors). The remaining openings have been assumed unprotected and to progressively flood regardless of open-closed status if submerged. The watertight door barrier elements are categorised in accordance with IMO MSC.1/Circ.1380 (IMO 2011), which set restrictions on usage of the doors while operating at sea and are therefore directly influencing the opening probability, and subsequent flooding risk of the vessel. The various categories are summarised in Table 2.

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Emergencies

Maritime operational risk management using dynamic barriers