CFR > Title 46 - Shipping > CHAPTER I—COAST GUARD, DEPARTMENT OF HOMELAND SECURITY > SUBCHAPTER S—SUBDIVISION AND STABILITY (parts 170 to 174) > PART 171—SPECIAL RULES PERTAINING TO VESSELS CARRYING PASSENGERS > SUBPART D—Additional Subdivision Requirements (§171.085 to §171.109) > 171.106—Wells in double bottoms.

171.106—Wells in double bottoms.

(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.