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Heavy -duty cooling system
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Truck,Firefighting,Structural, 1,000 GPM, 4 by 2
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Dissimilar Metals



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MIL-T-28571G(NAVY)
during operating conditions of either stationary pumping or mobile performance
as specified.
3.3.1.1 Heat exchanger.  An auxiliary heat exchanger shall be provided,
which shall permit delivery of water from the fire pump to heat exchanger for
cooling of the engine liquid coolant without admixture,  The heat exchanger may
be separate from the radiator.  The discharge water from the heat exchanger
shall be piped into the suction side of the fire pump.  The size of the heat
exchanger discharge line shall be large enough to eliminate back pressure on the
heat exchanger.  The flow of water from the fire pump to the heat exchanger
shall be controlled by a valve, with the valve control extended to the fire pump
operator's control panel and specifically identified on that panel.
3.3.1.2 Drain valves.  Water drain valves shall be installed at the low
point of the cooling and heat exchanger systems and at any other points
necessary to completely drain the systems.  The drain valves shall be of a type
that will remain closed under the most severe operating conditions to be
encountered by the fire truck.  Drain lines shall be furnished and shall
discharge to the ground at a point not above the bottom of the chassis frame.
3.3.3 Coolant system and indicators.  The coolant system shall include a
de-aeration system, a surge tank, or a coolant recovery reservoir of not less
than 2-quart capacity.  A high coolant temperature or low coolant level alarm
buzzer and red indicator warning light shall be provided on the cab dash
instrument panel and on the pump operator control panel.  A radiator servicing
access door shall be provided to allow verification of coolant level. The
coolant system shall be filled to capacity with a clean solution of ethylene
glycol and water in equal parts by volume.  A warning tag shall be securely
attached to the radiator filler neck with the information "COOLING SYSTEM FILLED
WITH WATER AND ETHYLENE GLYCOL IN EQUAL PARTS BY VOLUME - DO NOT DRAIN
3.3.4 Radio interference e suppre ssors.  The fire truck shall be suppressed to
limit electromagnetic radiation in accordance with SAE J551.  Any body equipment
emitting electromagnetic radiation shall be suppressed to the same level as the
vehicle chassis.  Certification of compliance with SAE J551 shall be provided.
3.3.5 Sound level.  The exterior sound level produced by the truck, except
for trucks with California destinations, shall not exceed the noise limits
established by the EPA.  The exterior sound level produced by the trucks
destined for California shall not exceed the noise limits established by the
California Vehicle Code, Section 27220.  The interior sound level shall be in
accordance with DoT Federal Motor Carrier Safety Regulations, Section 393.94 and
in compliance with NFPA-1901.
3.3.6 Air P ollution control.  Trucks shall comply with EPA Code of Federal
Regulations Governing Control of Air Pollution from New Motor Vehicles and New
Motor Vehicle Engines in effect on the date of manufacture.  Trucks shall also
meet emission requirements at final destination, in addition to EPA standards;
i.e. California.
3.3.7 Engine hour meter.  An engine hour meter, having a totalizing
mechanism of not less than 9,999 hours, shall be furnished for the truck chassis
engine to register accurately the number of hours of operating time.  The meter
shall be of rugged construction to insure continuous trouble-free performance
5

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