Watertight doors are located in watertight bulkheads below freeboard deck and shall withstand a static pressure from both sides. Design pressure for the door is given in meter water head by measuring the distance from the freeboard deck and down to the sill of the door in the most vulnerable damage situation for the vessel.

Type approval certificates or case by case approval, and watertight test certificate for each individual door, verified by the classification society, is required.

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