MIL-PRF-53047B
potable water shall not impart taste to a level higher than Flavor Threshold No. 4. When tested to
APHA, part 207, the water shall not impart odor to a level higher than Threshold Odor No. 3.
3.7.1.5 Design, material, and manufacturing processes. Unless otherwise specified, the
design, materials, and manufacturing process selection is the prerogative of the contractor as long
as all articles submitted to the government fully meet the operating, interface, ownship and
support, and operating environment requirements specified.
3.7.2 Protective devices.
3.7.2.1 Low oil pressure. The system shall be provided with means to shut down the engine
when the oil pressure falls below the minimum operating pressure, as specified by the engine
manufacturer.
3.7.2.2 High water temperature. The system shall be provided with means to shut down the
engine when the temperature of incoming potable water reaches 140 ± 5 °F.
3.7.2.3 Low water temperature. The system shall be provided with means to shut down the
engine when the temperature of incoming potable water reaches 58 ± 3 °F.
3.7.2.4 Safety. All rotating or reciprocating parts shall be guarded against hazard to
personnel. All parts that are subject to high operational temperatures shall be guarded against
hazard to personnel. All electrical terminals shall be completely enclosed or insulated to prevent
inadvertent contact by personnel or equipment that may cause arcing. The engine exhaust system
shall be designed, located, and installed to minimize fire hazards in the event of fuel spillage
during refueling. The exhaust system shall incorporate a spark arresting muffler, if applicable, to
the type of engine used. The refrigeration system shall be protected against over-pressure.
3.7.3 Reliability. The chiller shall be inherently reliable.
3.7.3.1 Maintenance ratio. The water chiller shall have a maintenance ratio not greater than
0.08. Maintenance ratio is the total active maintenance man-hours required (scheduled and
unscheduled) in comparison to the total operating hours. Work-hours for repair of replaced
components scheduled before, during, and after operation checks are excluded.
3.7.4 Cleaning, treatment, and painting. Unless otherwise specified (see 6.2), all surfaces,
painted internally and externally shall be cleaned, treated, and painted according to the
manufacturer's standard commercial practice. MIL-C-46168 shall be used as a guide for coating.
The color of the exterior shall be Tan 686. Color no. 33446 of FED-STD-595 shall be used as a
guide.
3.8 Marking.
3.8.1 Identification marking. Identification marking shall be permanent, legible, and shall
include, as a minimum, the manufacturer's identification code and part number, and the unit's
weight and date of manufacture.
3.8.2 Operating instructions. Instructions deemed essential for safe and efficient operation of
the water chiller shall be furnished on a plate attached to the unit. The instructions shall be clear,
concise and placed adjacent to the unit operating controls. Piping and wiring diagrams, and any
other data necessary for the maintenance or preservation, for storage or transport, of the unit shall
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