[Code of Federal Regulations]

[Title 46, Volume 4]

[Revised as of October 1, 2006]

From the U.S. Government Printing Office via GPO Access

[CITE: 46CFR108.441]



[Page 136]

 

                            TITLE 46_SHIPPING



                  (This book contains parts 90 to 139)

 

   CHAPTER I--COAST GUARD, DEPARTMENT OF HOMELAND SECURITY (CONTINUED)

 

PART 108_DESIGN AND EQUIPMENT--Table of Contents

 

                  Subpart D_Fire Extinguishing Systems

 

Sec.  108.441  Piping and discharge rates for CO[bdi2] systems.



    (a) The size of branch lines to spaces protected by a CO2 

system must meet Table 108.441.

    (b) Distribution piping within a space must be proportioned from the 

supply line to give proper distribution to the outlets without 

throttling.

    (c) The number, type, and location of discharge outlets must 

distribute the CO2 uniformly throughout the space.



                   Table 108.441--CO2 System Pipe Size

------------------------------------------------------------------------

                                             Minimum pipe size (inches),

 CO2 supply in system, kilograms (pounds)       millimeters (inches)

------------------------------------------------------------------------

45 (100)..................................  12.7 (\1/2\).

104 (225).................................  19.05 (\3/4\).

136 (300).................................  25.4 (1).

272 (600).................................  31.75 (1\1/4\).

450 (1,000)...............................  38.10 (1\1/2\).

1,110 (2,450).............................  50.80 (2).

1,130 (2,500).............................  63.5 (2\1/2\).

2,023 (4,450).............................  76.2 (3).

3,229 (7,100).............................  88.9 (3\1/2\).

4,750 (10,000)............................  101.6 (4).

6,818 (15,000)............................  114.3 (4\1/2\).

------------------------------------------------------------------------



    (d) The total area of all discharge outlets must be more than 35 

percent and less than 85 percent of the nominal cylinder outlet area or 

the area of the supply pipe, whichever is smaller. The nominal cylinder 

outlet area in square centimeters is determined by multiplying the 

factor 0.0313 by the number of kilograms of CO2 required. 

(The nominal cylinder outlet area in square inches is determined by 

multiplying the factor 0.0022 by the number of pounds of CO2 

required). The nominal cylinder outlet area must not be less than 71 

square millimeters (0.110 square inches).

    (e) A CO2 system must discharge at least 85 percent of 

the required amount within 2 minutes.