know your Marine Staff what is collision bulkhead verse watertight bulkhead and extends from the bottom of the hole to the freeboard decker to the forecastle deck and is designed to keep water away from the forward hold in case of bow collision damage in this image you can see a collision bulkhead in the forward part of the ship the regulations require that the bulkhead is watertight from the bottom of the ship up to the bulkhead deck what is the location of watertight bulkhead every ship shall be with a collision bulkhead in the forward up to the freeboard deck at a distance of five percent of the length or 10m TRS whichever is less from the forward perpendicular and it must not be far from more than 0.08 L or 0.05 L plus three meters whichever is the greater location is such that it is not so much forward as to get damaged on impact neither it should be too far aft so that compartment flooded forward causes extensive trim by head as a rule located at minimum distance to get maximum space for cargo summary tool now one minimum at one tour of ships lengths from forward perpendicular to yet is continuous to uppermost continuous deck three the collision bulkhead is 20% stronger than other bulkheads for collision bulkhead is five to eight percent of ships length from forward other regulations regarding collision bulkhead one the collision bulkhead may have recess er steps to pipes piercing bulk heads shall be fitted with valves which are operable from above the freeboard deck in the valve chest shall be secured to the bulkhead in the forepeak the valve may be fitted after the collision bulkhead we're such valve is easily accessible under all service conditions but the space shall not be a cargo space three no doors nan hole or any other opening shall be fitted in the collision bulkhead for stiffeners maybe spaced 600 millimeters of heart five tightness can be tested by filling the forepeak tank to the level of water line or hose test along the boundary water leaked through other sides six two pipes maybe to pierce the collision bulkhead before peak is divided into two compartments these compartment must be designed to hold two different liquids yeah [Music]