MIL-PRF-53047B
Adapter, tank feed
3.3.8.8
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3.2 First Article. When specified (see 6.2), a sample shall be subjected to first article
inspection in accordance with 4.2.
3.3 Physical characteristics.
3.3.1 Water chiller unit. The water chiller shall be comprised of a cooling unit, a pump, and
diesel fueled power source. The unit shall have an enclosure to keep out debris and projectiles
thrown up from the towing vehicle. The enclosure shall be designed to facilitate access for
maintenance and repair, and shall be provided with quick-release fasteners that do not require the
use of tools to operate.
3.3.1.2 Dimensions. The water chiller shall conform to the dimensions as shown in figure 1.
3.3.1.3 Weight. The water chiller unit, as assembled for operation, shall not exceed 325
pounds in weight.
3.3.1.4 Structural support. The water chiller unit shall withstand, and the mounting cradle
shall have sufficient structural strength to bear the weight of the components, while operating and
being transported, as specified herein.
3.3.1.4.1 Auxiliary handling. In addition to provisions for mechanical handling equipment, the
unit shall be provided with hardware which would allow manual movement of the unit. This
method should sustain the weight of the unit and allow respositioning of the unit by four
personnel.
3.3.2 Engine. The engine shall function properly with military lubricants and shall operate on
diesel fuel conforming to A-A-52557, and Jet A1 fuel conforming to ASTM D 1655 with static
dissipaters, and icing and corrosion inhibitors (JP-8). The engine shall be air cooled,shall recoil
and electric start, and shall drive the water pump/cooler at the continuous rated output as
specified herein. The drive connection shall be such that the cooler and pump operates at
optimum speed when the engine operates at optimum speed.
3.3.2.1 Start system. The engine shall be equipped with both a manual (recoil) and electric
start system. The start system/engine shall be under no load condition to facilitate starting. The
engine electric start system shall be 24 Volts Direct Current (VDC) and powered by the slave
receptacle identified in 3.3.5.2. An engine activation device shall be used and located on the
operational control panel (see 3.3.6). The manual (recoil) start system does not have to be located
in the operational control panel but must be able to be utilized without moving the chiller or
removing its housing.
3.3.2.2 Control systems. The engine shall have a positive means of shut off under any
condition. All engine controls shall be operator accessible through any shielding or baffling used.
Speed control shall have an idle position and an operational position with positive lock in each
position.
3.3.2.3 Exhaust system. The engine exhaust system shall be designed and located so that it
does not present a hazard to personnel or impede operations specified herein. The exhaust shall
be permitted to extend beyond the overall dimensions of the water chiller unit in operation, but
shall be retractable within the envelope, or be readily detachable, for storage and transport.
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