[Code of Federal Regulations]
[Title 46, Volume 7]
[Revised as of October 1, 2004]
From the U.S. Government Printing Office via GPO Access
[CITE: 46CFR171.067]

[Page 127-129]
 
                           TITLE 46--SHIPPING
 
   CHAPTER I--COAST GUARD, DEPARTMENT OF HOMELAND SECURITY (CONTINUED)
 
PART 171_SPECIAL RULES PERTAINING TO VESSELS CARRYING PASSENGERS--Table 
of Contents
 
                         Subpart C_Large Vessels
 
Sec. 171.067  Treatment of stepped and recessed bulkheads in Type I 
subdivision.

    (a) For the purpose of this section--
    (1) The main transverse watertight bulkhead immediately forward of a 
stepped bulkhead is referred to as bulkhead 1; and
    (2) The main transverse watertight bulkhead immediately aft of the 
stepped bulkhead is referred to as bulkhead 3.
    (b) If a main transverse watertight bulkhead is stepped, it and 
bulkheads 1 and 3 must meet one of the following conditions:
    (1) The separation between bulkheads 1 and 3 must not exceed the 
following:
    (i) If the factor of subdivision (FS) determined from Sec. 171.065 
(a) or (b) is greater than 0.9, the distance between bulkheads 1 and 3 
must not exceed the maximum separation calculated to demonstrate 
compliance with Sec. 171.065.
    (ii) If the factor of subdivision is 0.9 or less, the distance 
between bulkheads 1 and 3 must not exceed 90% of the floodable length or 
twice the maximum bulkhead separation calculated to demonstrate 
compliance with Sec. 171.065, whichever is smaller.
    (2) Additional watertight bulkheads must be located as shown in 
Figure 171.067(a) so that distances A, B, C, and D, illustrated in 
Figure 171.067(a), satisfy the following:
    (i) Distances A and B must not exceed the maximum spacing allowed by 
Sec. 171.065.
    (ii) Distances C and D must not be less than the minimum separation 
prescribed by Sec. 171.065(e).
    (3) The distance A, illustrated in Figure 171.067(b), must not 
exceed the maximum length determined in Sec. 171.065 corresponding to a 
margin line taken 3 inches (7.6 cm) below the step.
    (c) A main transverse bulkhead may not be recessed unless all parts 
of the recess are inboard from the shell of the vessel a distance A as 
illustrated in Figure 171.067(c).
    (d) Any part of a recess that lies outside the limits defined in 
paragraph (c) of this section must be treated as a step in accordance 
with paragraph (b) of this section.
    (e) The distance between a main transverse watertight bulkhead and 
the transverse plane passing through the nearest portion of a recessed 
bulkhead must be greater than the minimum separation specified by Sec. 
171.065(e).
    (f) If a main transverse bulkhead is stepped or recessed, equivalent 
plane bulkheads must be used in the calculations required to demonstrate 
compliance with Sec. 171.065.

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