Redwood National Park, 1111 Second Street, Crescent City, CA 95531

42 -- FIRE FIGHTING EQUIPMENT Sol 1443RP848096011 due 081996 Contact Tekla Vines, (707) 464-6101, X5040/Contract Specialist The National Park Service has a requirement for the supply and delivery of one easily removable, slide-in compressed air foam module to fit a 12000 GVW Chevrolet K3500 truck. Unit shall be capable of discharging water, foam solution or compressed air foam from all discharge ports, with the ability to individually adjust the consistency of the compressed air foam (wet to dry) from each discharge. The entire CAFS module shall be supported and enclosed by a welded aluminum frame, with subframe to support weight of module while in the apparatus, and during loading and unloading. Subframe shall accommodate use of forklift for loading and unloading the unit. The sides and top of the framework shall be fabricated of aluminum. The side panels shall have expanded aluminum ventilation inserts and shall be attached to the frame with stainless steel machine screws. The top cover shall be split into two hinged access doors with the edges forming a rain-tight fit. Doors shall have center mounted stainless steel piano hinges and quarter-turn latches, and provide service access to all areas inside the module. The CAFS unit shall fit into an envelope with the following dimensions: All measurements are inside diameter: Length: 105 1/2''; Width: 53''; Height: 26 3/4''; Weight; not exceed 3800 lbs, fully loaded; the unit may be less than 53'' wide and more than 26 3/4'' in height but shall not be less than 105'' in length. Tank capacity: 200 gallons. The compressed air foam system shall develop a minimum of 120 gallons per minute of water at 150 PSI and 60 cubic feet of air at 150 PSI simultaneously. Unit shall also be capable of pumping water or air independently. The engine shall be a two cylinder, four cycle diesel type developing 30 shaft horsepower. The engine shall have a cast iron block, 84 cubic inch displacement, air/oil cooling, electric start, 12 volt electrical system with 35 amp alternator, spin-on oil filter, oil cooler and spark arrester muffler. The engine shall draw its fuel from the chassis fuel tank. Chassis battery shall be utilized for engine start. An extension hose shall be installed on the engine oil drain of the pump engine with a valve located at the oil pan and a plug installed in the end of the hose to simplify oil changes. The water pump and air compressor shall be driven by a common power transmission. The transmission gears shall be of the helical type, precision cut and crown ground for reduced noise levels. The transmission shafts shall be constructed of heat treated chrome nickel steel and shall each be supported by two deep groove ball bearings. The transmission case shall include gasketless design that utilizes ``O'' rings for a positive seal. An oil level window shall be provided in the side of the case and an oil fill opening located on the top. A 1. 5AG water pump shall be utilized. It shall utilize a marine aluminum case, bronze impeller, front and rear seal rings, wrap-around wear rings, maintenance free mechanical seal, 2'' suction inlet and 2'' discharge outlet. The pump shall be driven via a gear drive mechanism with all ball bearing construction and 1-1/2'' heat treated helical gears. The pump ratio shall be 2.45 to 1. The pump shall be mounted to the engine coupled with a flywheel mounted flexplate. Pump primer shall be a pneumatically operated, oil-free priming system capable of priming the water pump through 20 feet of hard suction hose with a 10 foot lift. Air compressor shall be of the encapsulated oil flooded rotary screw type, sized to supply a minimum of 60 CFM of free air at maximum engine RPM. The compressor sump shall be integrated into the compressor rotor housing. A spin-on cartridge type air/oil separator with service indicators and a spin-on filter shall also be integrated onto the compressor assembly with replacement elements readily available. The compressor shall be driven via a dry polychain drive from the engine crankshaft. The compressor drive ratio shall allow operation of the air end at maximum RPM while the water pump is developing 130 to 140 PSI in a ``no-flow'' state. The air compressor shall be capable of maintaining prolonged pressures from 100 to 175 pounds per square inch throughout the service lift of the complete CAFS unit. A 12 volt electric clutch, rated for the applied load shall be provided on the crankshaft sprocket, allowing operation with or without the compressor engaged. A heavy duty on/off clutch switch and indicator light shall be installed on the pump panel. The compressor shall be controlled by a pneumatic modulating inlet valve mounted to the air end inlet. This controller shall sense air pressure and control the air delivery of the air end while maintaining constant pressure. An auto sync balancing system shall be provided to automatically maintain the air pressure within plus-or-minus 2% of the water pump pressure, throughout the operating range. Auto sync controls shall be installed on the operator's panel and feature the following modes: Automatic: Air pressure matched to water pressure. Fixed: Air pressure defaults to manual setting on compressor mounted control valve. Unload: Air pressure reduced to 40 PSI for standby operations. The air compressor shall be cooled by the unit's water pump, utilizing a shell and tube heat exchanger of all brass and copper construction. Water shall flow through the heat exchanger whenever the pump is operating. The air compressor cooling system shall incorporate a thermostat that maintains the system oil temperature within a 168 to 225 degree Fahrenheit range. The system shall be capable of maintaining recommended operating temperatures throughout the full operational range in ambient temperatures up to 115 degrees Fahrenheit. An automotive type air intake filter shall be provided on the compressor inlet valve. Suction piping shall be 2'' brass with a 2'' tank to pump valve, controlled at the pump panel. Another 2'' valve shall be provided at the pump panel for suction with a 1-1/3'' NST-M connection. A 2'' wye strainer shall be provided in the suction line at the pump head. All valves shall be Akron or Elkhart brand, or Equal. Plumbing to two 2-1/2'' discharge outlets, and the 1-1/2'' tank full line shall all be brass with flexible reinforced wire braid hose. Discharge valves are to be Akron or Elkhart brand or Equal. A Foampro 1600 or Equal type foam proportioner shall be provided to inject foam into all discharges. A check valve shall be provided ahead of the pressure differential valve to prevent backflow. A 12 volt electric refill pump with panel mounted switch and foam connection shall be included and plumbed to refill from and external source. The proportioner shall utilize an eight gallon concentrate bladder tank. All air lines shall be rated to a minimum of 250 PSI. All air line fittings shall be of brass or bronze construction. Stainless steel bushing check valves shall be utilized at air injection points to prevent water/solution flow into air lines. The pump panel shall be constructed of smooth aluminum plate with a durable finish. An expanded a aluminum radiator grill shall be recessed into the panel. The pump panel shall be located at the rear of the slide-in unit and shall be directly accessible to the operator standing at the rear of the vehicle. The following controls and instruments shall be provided on the panel: Two each shielded pump panel lights and switch, 2-1/2'' Class 1 master pump pressure gauge with white dial, 2-1/2'' Class one master air pressure gauge with black dial, air compressor temperature switch gauge and audible alarm, engine oil pressure gauge with light and audible alarm, engine temperature gauge with light and alarm, hour meter, ignition switch, engine start switch, Vernier throttle control, auto sync compressor controls, proportioner controls, foam flush valve, two panel mounted 1-1/2'' discharge outlets, two 1-1/2'' push-pull discharge controls, pneumatic primer controls, two compressed air discharge controls, color coded and located next to respective water discharge controls,a auxiliary air outlet and valve control, push-pull tank to pump control, push-pull tank fill valve control, section valve with 1-1/2'' NST-M connection and control. Push-pull controls shall be Class 1 chrome plated type with I.D. tags recessed into handles. Color coded pump panel tags shall be utilized for each instrument and control. An aluminum hose reel with twin rollers on each side shall be attached over the tank, to accommodate 200 feet of standard hard line hose. Due to the above very strict specification requirements and mandatory combination of features the NPS intends to award a sole source contract to PNEUMAX, Glendale, Arizona who has the capability of meeting these requirements. See Numbered Note 2. (190)

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