What is regulation for Collision bulkhead as per SOLAS ?

As per (SOLAS  Ch II-1, Reg 12.1).

The collision bulkhead must be located not less than 0.05L or 10 metres, whichever is the lesser from the forward perpendicular and not more than 0.08L or 0.05L+3 m, whichever is the greater  The regulations require that the bulkhead is watertight from the bottom of the ship, up to the bulkhead deck.

The collision bulkhead may have steps or recesses, but no doors, manholes, access openings, ventilation ducts or other openings can be fitted in the bulkhead below the bulkhead deck. There is only one exception and that is a single pipeline which is allowed to penetrate the bulkhead for the purpose of filling and emptying the forepeak tank

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