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TM 07661B-14/1
APPENDIX A
CHAPTER 1
GENERAL INSTRUCTIONS
Section I. GENERAL DESCRIPTION AND SPECIFICATION DATA
A 1-1. SCOPE. This manual covers the initial preparation, operation and the first through fourth maintenance echelons
of the Model 450PKP/100AFFF03638MC Self-Contained Dry Chemical Aqueous Film Forming Foam (AFFF) Fire
Extinguisher. This equipment was procured under contract M00027-84-C-0071.
A 1-2. PURPOSE. The equipment covered by this manual is intended for fire protection of U.S. Marine Corps bulk fuel
systems. In particular these include the Tactical Airfield Fuel Dispensing System (TAFDS) described in NAVAIR 19-
190TM, and the Amphibious Assault Fuel System (AAFS) described in ENG-50 or ENG-TM-06674A-15. These tactical
moveable fuel systems contain a series of large, lightweight, nylon impregnated or polyester bladder type fuel tanks.
Capacity of each tank is either 10,000 or 20,000 gallons. The tanks are used to store MOGAS, AVGAS, Turbine or
Diesel fuel. These tanks are normally arranged in farms of six tanks (60,000 or 120,000 gallon capacity). If tank farms
are carefully installed a single model 450PKP/100AFFF03638MC fire extinguisher can protect an entire six-tank farm
with the use of the 150-foot remote hose reel.
A 1-3. GENERAL DESCRIPTION.
a.
The model 450PKP/100AFFF03638KC twin agent fire extinguisher is skid mounted and easily relocated when
necessary. It is equipped with two fire fighting agents. These agents are a dry chemical and an Aqueous Film Forming
Foam. The dry chemical extinguishes fires by breaking up flame propagation, and is compatible with mechanical foam.
Water mixed with the Aqueous Film Forming Foam (AFYF) concentrate forms a foam which is then used to form a film
over the extinguished area, effectively preventing reignition. These two agents are stored in containers on the
extinguisher, making the unit self-contained. A 150-foot, noncollapsible hose and discharge nozzle is provided for each
chemical agent. The hoses are twinned by encasing them in a single cover for convenience in storage and use; while the
nozzles are close-coupled by a tie bar. The hose is stored on a twin agent hose reel at the front of the unit when not in
use. Additional area coverage without moving the extinguisher is provided by a remote cart. This coverage is necessary
to reach bulk fuel bladder tanks spaced sufficiently far apart to prevent secondary fires in adjacent tanks. Without this
150 foot remote hose cart, additional extinguishers would be required.
b.
The following dry chemical and Aqueous Film Forming Foam (AFFF) are used on this fire extinguisher.
(1)
Potassium bicarbonate (Purple K) conforming to MIL-F22287A or Federal Specification O-D-1407.
A 1-1
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