46 C.F.R. § 171.106 Wells in double bottoms.
Title 46 - Shipping
(a) This section applies to each vessel that has a well installed in a double bottom required by §171.105. (b) Except as provided in paragraph (c) of this section— (1) The depth of a well must be at least 18 inches (45.7 cm) less than the depth of the double bottom at the centerline; and (2) The well may not extend below the horizontal plane C illustrated in Figure 171.105. (c) A well may extend to the outer bottom of a double bottom at the after end of a shaft tunnel.
Title 46: Shipping
PART 171—SPECIAL RULES PERTAINING TO VESSELS CARRYING PASSENGERS
Subpart D—Additional Subdivision Requirements
§ 171.106 Wells in double bottoms.
