[Code of Federal Regulations]
[Title 46, Volume 1]
[Revised as of Octobery 1, 2004]
From the U.S. Government Printing Office via GPO Access
[CITE: 46CFR34.20-5]

[Page 456-457]
 
                           TITLE 46--SHIPPING
 
         CHAPTER I--COAST GUARD, DEPARTMENT OF HOMELAND SECURITY
 
PART 34_FIREFIGHTING EQUIPMENT--Table of Contents
 
                 Subpart 34.20_Deck Foam System, Details
 
Sec. 34.20-5  Quantity of foam required--T/ALL.

    (a) Area protected. Systems of this type are designed to give 
primary protection to the spaces over the cargo tanks.
    (b) Rate of application. The water rate of the foam production 
equipment shall be determined as follows:
    (1) For usual petroleum products the rate of supply of foam solution 
shall be not less than the greatest of the following:
    (i) 0.6 liters/min per square meter of cargo tanks deck area, where 
cargo tanks deck area means the maximum breadth of the ship multiplied 
by the total longitudinal extent of the cargo tank spaces;
    (ii) 6 liters/min per square meter of the horizontal sectional area 
of the single tank having the largest such area; or
    (iii) 3 liters/min per square meter of the area protected by the 
largest monitor, such area being entirely forward of the monitor, but 
not less than 1,250 liters/min.
    (2) For polar solvent products (e.g. alcohols, ketones, etc.) the 
water rate shall be determined for each vessel.

[[Page 457]]

The rate will depend upon the vessel design, products to be carried and 
foam system to be used.
    (c) Supply of foam-producing material. Each deck foam system must 
have a supply of foam-producing material sufficient to operate the 
system at its designed rate of foam production for the following 
periods:
    (1) For installations contracted for on or after January 1, 1970, 15 
minutes without recharging, except as required in paragraph (c)(2) of 
this section.
    (2) For installations on ships that have a keel laying date on or 
after January 1, 1975, 20 minutes without recharging.
    (d) Separate supply of foam-producing material. Where the same foam-
producing material may be used for this system as well as a fixed foam 
system, separate supplies need not be provided for each space protected. 
The total available supply shall be at least sufficient for the space 
requiring the greatest amount.
    (e) Water supply. Suitable pumps shall be provided capable of 
producing the required water rate. The fire pumps required by subpart 
34.10 may be used for this purpose; however, the operation of the deck 
foam system shall not interfere with the simultaneous use of the fire 
main system.

[CGFR 65-50, 30 FR 16694, Dec. 30, 1965, as amended by CGFR 69-72, 34 FR 
17481, Oct. 29, 1969; CGD 74-127, 41 FR 3846, Jan. 26, 1976; CGD 95-028, 
62 FR 51199, Sept. 30, 1997]