[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: 46CFR193.15-90]

[Page 378]
 
                           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. 193.15-90  Installations contracted for prior to March 1, 1968.

    (a) Installations contracted for prior to March 1, 1968, shall meet 
the following requirements:
    (1) Existing arrangements, materials, and facilities previously 
approved shall be considered satisfactory so long as they meet the 
minimum requirements of this paragraph and they are maintained in good 
condition to the satisfaction of the Officer in Charge, Marine 
Inspection. Minor repairs, alterations, and replacements may be 
permitted to the same standards as the original installations. However, 
all new installations or major replacements shall meet the applicable 
requirements in this subpart for new installations.
    (2) The details of the systems shall be in general agreement with 
Sec. Sec. 193.15-5 through 193.15-40 insofar as is reasonable and 
practicable, with the exception of Sec. 193.15-5(d) (1), (2), and (4), 
covering machinery spaces, etc., which systems may be installed in 
accordance with paragraphs (a) (3) through (6) of this section.
    (3) In boilerrooms, the bilges shall be protected by a system 
discharging principally below the floorplates. Perforated pipe may be 
used in lieu of discharge nozzles for such systems. The number of pounds 
of carbon dioxide shall be equal to the gross volume of the boilerroom 
taken to the top of the boilers divided by 36. In the event of an 
elevated boilerroom which drains to the machinery space, the system 
shall be installed in the engineroom bilge and the gross volume shall be 
taken to the flat on which the boilers are installed.
    (4) In machinery spaces where main propulsion internal combustion 
machinery is installed, the number of pounds of carbon dioxide required 
shall be equal to the gross volume of the space taken to the under side 
of the deck forming the hatch opening divided by 22.
    (5) In miscellaneous spaces other than cargo or main machinery 
spaces the number of pounds of carbon dioxide required shall be equal to 
the gross volume of the space divided by 22.
    (6) Branch lines to the various spaces other than cargo and similar 
spaces shall be as noted in Table 193.15-90(a)(6). This table is based 
on cylinders having discharge outlets and siphon tubes of \3/8\-inch 
diameter.

                          Table 193.15-90(a)(6)
------------------------------------------------------------------------
              Number of cylinders
------------------------------------------------    Nominal pipe size,
                Over                   Not over           inches
------------------------------------------------------------------------
                                              2  \1/2\--standard.
2...................................          4  \3/4\--standard.
4...................................          6  1--extra heavy.
6...................................         12  1\1/4\--extra heavy.
12..................................         16  1\1/2\--extra heavy.
16..................................         27  2--extra heavy.
27..................................         39  2\1/2\--extra heavy.
39..................................         60  3--extra heavy.
60..................................         80  3\1/2\--extra heavy.
80..................................        104  4--extra heavy.
104.................................        165  5--extra heavy.
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