[Code of Federal Regulations]
[Title 46, Volume 7]
[Revised as of October 1, 2003]
From the U.S. Government Printing Office via GPO Access
[CITE: 46CFR193.15-10]

[Page 375-376]
 
                           TITLE 46--SHIPPING
 
   CHAPTER I--COAST GUARD, DEPARTMENT OF HOMELAND SECURITY (CONTINUED)
 
PART 193--FIRE PROTECTION EQUIPMENT--Table of Contents
 
      Subpart 193.15--Carbon Dioxide Extinguishing Systems, Details
 
Sec. 193.15-10  Controls.

    (a) Except as noted in Sec. 193.15-20(b), all controls and valves 
for the operation of the system shall be outside the space protected and 
shall not be located in any space that might be cut off or made 
inaccessible in the event of fire in any of the spaces protected.
    (b) If the same cylinders are used to protect more than one hazard, 
a manifold with normally closed stop valves shall be used to direct the 
carbon dioxide into the proper space. If cylinders are used to protect 
only one hazard, a normally closed stop valve shall be installed between 
the cylinders and the hazard except for systems of the type indicated in 
Sec. 193.15-5(d) which contain not more than 300 pounds of carbon 
dioxide.
    (c) One of the stations controlling the system for the main 
machinery space and the chemical storerooms shall be located as 
convenient as practicable to one of the main escapes from these spaces. 
All control stations and the individual valves and controls shall be 
marked as required by Secs. 196.37-10 and 196.37-13 of this subchapter.
    (d) Systems of the type indicated in Sec. 193.15-5(d) shall be 
actuated by one control operating the valve to the space and a separate 
control releasing at least the required amount of carbon dioxide. These 
two controls shall be located in a box or other enclosure clearly 
identified for the particular space. Those systems installed without a 
stop valve shall be operated by one control releasing at least the 
required amount of carbon dioxide.
    (e) Where provisions are made for the simultaneous release of a 
given amount of carbon dioxide by operation of a remote control, 
provisions shall also be

[[Page 376]]

made for manual control at the cylinders. Where gas pressure from pilot 
cylinders is used as a means for releasing the remaining cylinders, not 
less than two pilot cylinders shall be used for systems consisting of 
more than two cylinders. Each of the pilot cylinders shall be capable of 
manual control at the cylinder, but the remaining cylinders need not be 
capable of individual manual control.
    (f) Systems of the type indicated in Sec. 193.15-5(d), other than 
systems for tanks, which are of more than 300 pounds of carbon dioxide, 
shall be fitted with an approved delayed discharge so arranged that the 
alarm will be sounded for at least 20 seconds before the carbon dioxide 
is released into the space. Such systems of not more than 300 pounds of 
carbon dioxide shall also have a similar delayed discharge, except for 
those systems for tanks and for spaces which have a suitable horizontal 
escape.
    (g) All distribution valves and controls shall be of an approved 
type. All controls shall be suitably protected.
    (h) Complete but simple instructions for the operation of the 
systems must be located in a conspicuous place at or near all pull 
boxes, stop valve controls and in the CO2 cylinder storage 
room. On systems in which the CO2 cylinders are not within 
the protected space, these instructions must also include a schematic 
diagram of the system and instructions detailing alternate methods of 
discharging the system should the manual release or stop valve controls 
fail to operate. Each control valve to branch lines must be marked to 
indicate the related space served.
    (i) If the space or enclosure containing the carbon dioxide supply 
for controls is to be locked, a key to the space or enclosure shall be 
in a break-glass-type box conspicuously located adjacent to the opening.

[CGFR 67-83, 33 FR 1145, Jan. 27, 1968, as amended by CGD 74-100R, 40 FR 
6209, Feb. 10, 1975]