[Code of Federal Regulations]
[Title 46, Volume 4]
[Revised as of October 1, 2002]
From the U.S. Government Printing Office via GPO Access
[CITE: 46CFR111.97-5]

[Page 244-245]
 
                           TITLE 46--SHIPPING
 
    CHAPTER I--COAST GUARD, DEPARTMENT OF TRANSPORTATION (CONTINUED)
 
PART 111--ELECTRIC SYSTEMS--GENERAL REQUIREMENTS--Table of Contents
 
     Subpart 111.97--Electric Power-Operated Watertight Door Systems
 
Sec. 111.97-5  Electric and hydraulic power supply.

    (a) Each electric motor-driven door operating system must have the 
same source of power as the emergency lighting and power system.
    (b) The temporary emergency power source and the final emergency 
power

[[Page 245]]

source must each be capable of operating all doors simultaneously or 
sequentially as allowed by Sec. 170.270(c) of this chapter.
    (c) The power supply for each hydraulically operated watertight door 
system that uses a hydraulic system common to more than one watertight 
door must be an accumulator tank with enough capacity to open all doors 
once and to close all doors two times and be supplied by one or more 
motor-driven hydraulic pumps that can operate from the final source of 
the emergency lighting and power system.
    (d) The motor-driven hydraulic pumps must automatically maintain the 
accumulator tank pressure within the design limits, be above the 
uppermost continuous deck, and be controlled from above the uppermost 
continuous deck.
    (e) The accumulator tank capacity required in paragraph (c) of this 
section must be available when the accumulator tank pressure is at the 
automatic pump ``cut-in'' pressure.
    (f) The source of power for each hydraulically operated watertight 
door system using an independent hydraulic system for each door operator 
must meet paragraphs (a) and (b) of this section.
    (g) The power supply for other types of watertight door operators 
must be accepted by the Commandant.

[CGD 74-125A, 47 FR 15236, Apr. 8, 1982, as amended by CGD 94-108, 61 FR 
28283, June 4, 1996; USCG-2000-7790, 65 FR 58462, Sept. 29, 2000]