[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: 46CFR193.15-15]

[Page 376-377]
 
                           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. 193.15-15  Piping.

    (a) The piping, valves, and fittings shall have a bursting pressure 
of not less than 6,000 pounds per square inch.
    (b) All piping, in nominal sizes not over \3/4\ inch shall be at 
least Schedule 40 (standard weight) and in nominal sizes over \3/4\ 
inch, shall be at least Schedule 80 (extra heavy).
    (c) All piping valves, and fittings of ferrous materials shall be 
protected inside and outside against corrosion unless specifically 
approved otherwise by the Commandant.
    (d) A pressure relief valve or equivalent set to relieve between 
2,400 and 2,800 pounds per square inch shall be installed in the 
distribution manifold or such other location as to protect the piping in 
the event that all branch line shutoff valves are closed.
    (e) All dead-end lines shall extend at least 2 inches beyond the 
last orifice and shall be closed with cap or plug.
    (f) All piping, valves, and fittings shall be securely supported, 
and where necessary, protected against injury.
    (g) Drains and dirt traps shall be fitted where necessary to prevent 
the accumulation of dirt or moisture. Drains and dirt traps shall be 
located in accessible locations where possible.
    (h) Piping shall be used for no other purpose except that it may be 
incorporated with the fire-detecting system.
    (i) Piping passing through living quarters shall not be fitted with 
drains or other openings within such spaces.
    (j) Installation test requirements are:
    (1) Upon completion of the piping installation, and before the 
cylinders are connected, a pressure test shall be applied as set forth 
in this paragraph. Only carbon dioxide or other inert gas shall be used 
for this test.
    (2) The piping from the cylinders to the stop valves in the manifold 
shall be subjected to a pressure of 1,000 pounds per square inch. With 
no additional gas being introduced to the system, it shall be 
demonstrated that the leakage of the system is such as not to permit a 
pressure drop of more than 150 pounds per square inch per minute for a 
2-minute period.
    (3) The individual branch lines to the various spaces protected 
shall be subjected to a test similar to that described in the preceding 
subparagraph with the exception that the pressure used shall be 600 
pounds per square inch in lieu of 1,000 pounds per square inch. For the 
purpose of this test, the distribution piping shall be capped

[[Page 377]]

within the space protected at the first joint ahead of the nozzles.
    (4) In lieu of the tests prescribed in the preceding paragraphs in 
this paragraph, small independent systems protecting spaces such as 
emergency generator rooms, lamp lockers, chemical storerooms, etc., may 
be tested by blowing out the piping with air at a pressure of at least 
100 pounds per square inch.