[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: 46CFR171.100]

[Page 136-137]
 
                           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 D_Additional Subdivision Requirements
 
Sec. 171.100  Shaft tunnels and stern tubes.

    (a) Stern tubes in each of the following vessels must be enclosed in 
watertight spaces:
    (1) Each vessel of 100 gross tons or more on an international 
voyage.
    (2) Each other vessel over 150 gross tons in ocean or Great Lakes 
service.
    (3) Each vessel under 100 gross tons that carries more than 12 
passengers on an international voyage.
    (b) The watertight seal in the bulkhead between the stern tube space 
and the machinery space must be located in a watertight shaft tunnel. 
The vessel must be designed so that the margin line will not be 
submerged when the watertight shaft tunnel is flooded.
    (c) If a vessel has two or more shaft tunnels, they must be 
connected by a watertight passageway.

[[Page 137]]

    (d) If a vessel has two or less shaft tunnels, only one door is 
permitted between them and the machinery space. If a vessel has more 
then two shaft tunnels, only two doors are permitted between them and 
the machinery space.