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TM 07661B-14/1
APPENDIX A
Table A 1-1. Reference Data Model 450 PKP/100 AFFF 03638MC
Fire Extinguisher (Continued)
Operating Temperature Range (w/
AFFF heater) .............................................................................................................................. 40 to 130° F
Weatherproofing ................................................................................................ Use
of
non-ferrous
metals
and
treatment of non-ferrous metals with
corrosion-resistant coatings, primer and
paints.
should be highly skilled, in order that the second man can replace the first if the need arises. The third man may be a
semi-trained operator, assisting only in maneuvering the hose. However, it is preferred that he also be well trained, in
order to back up the first two operators. Operators must be protected by special helmets and protective clothing
whenever using this equipment to fight a fire.
(3)
If the tanks and berms are installed as indicated in figure 1-6, a single tank fire burning unhampered to
completion would consume all 20,000 gallons of fuel in approximately 3 hours and 25 minutes. Unless other open,
adjacent quantities of spilled fuel are burning none of the adjacent tanks will ignite from the long-duration fire, regardless
of wind conditions. Since a single fully charged, properly installed and adequately manned extinguisher can extinguish
one such fire, it can protect an entire six-tank farm because initially only one fire would occur. If the tanks are spaced
further apart than shown, the 300-foot hoses cannot reach the most remote tank if the wind is blowing in an unfavorable
direction, i.e., towards the extinguisher. It is not feasible to increase hose length beyond 300 feet; the internal friction
decreases the nozzle pressure, flow rate and nozzle range to the extent that an entire berm cannot be covered from one
position. However the extinguisher will have sufficient quantities of agents and range, even with 300 feet of hose, to
cover the berm and extinguish the fire with minimum movement of the nozzle operator, provided that;
(a)
The operator is experienced or well trained,
(b)
The operator attacks the fire from a close-in, upwind position on the berm (normal procedure), and,
(c)
The berms are small in area.
(4)
Successful extinction of fires in berms requires a close-in position be taken by the extinguisher operators.
This is made necessary by the 40-50 foot range of the extinguishers chemical agents, combined by their limited
quantities. Such proximity to intense heat by extinguisher operators makes the wearing of protective clothing mandatory.
A 1-6. COMPONENTS.
a.
Dry Chemical Tank. The dry chemical container (1, figure 1-2) is a vertical mounted cylindrical tank constructed
of steel. All joints and connections are welded.
A 1-5
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