Code of Federal Regulations Title 46. Shipping § 46.171.085 Collision bulkhead

(1) 5 percent of the LBP from the forward perpendicular in a motor vessel;  and

(2) 5 feet (1.52 meters) from the forward perpendicular in a steam vessel.

(1) Is in ocean service;  and

(2) Has a superstructure that extends from a point forward of the collision bulkhead to a point at least 15 percent of the LBP aft of the collision bulkhead.

(1) The portion of the collision bulkhead above the bulkhead deck must be weathertight.

(2) If the portion of the collision bulkhead above the bulkhead deck is not located directly above the collision bulkhead below the bulkhead deck, then the bulkhead deck between must be weathertight.

(1) Be located above the bulkhead deck;  and

(2) Have a watertight closure.

(1) Must extend to the deck above the bulkhead deck if in ocean service as defined in § 170.050(f) of this chapter or to the bulkhead deck if in service on other waters;

(2) May not have watertight doors in it;  and

(3) May have penetrations and openings that—

(1) The lowest edge of the opening is not more than 12 inches (30.5 centimeters) below the bulkhead deck;  and

(2) There are at least 36 inches (92 centimeters) of intact collision bulkhead below the lower edge of the opening.

(1) At least 5 percent of the LBP from the forward perpendicular;  and

(2) No more than 15 percent of the LBP from the forward perpendicular if the space forward of the collision bulkhead is not subject to damage stability requirements and at any location aft of the location described in paragraph (j)(1) of this section if the space forward of the collision bulkhead is subject to damage stability requirements.