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|  MIL-P-23504(Wep)
operation under any of the conditions specified in paragraph 3.6.1 for
periods of not less than 24 hours without requiring shutdown for servicing
or maintenance.
3.6.3
Environmental Conditions
3.6.3.1
Temperature Operation: The vacuum pump shall be capable of oper-
sting in any ambient temperature between the limits of
and +130F.
3.6.3.2
Temperature Exposure: The vacuum pump shall be capable of with-
standing, without damage, storage at any temperature from -80 to +160F.
3.6.3.3 Humidity: The vacuum pump shall not be damaged by operation or
storage in any humidity conditions up to 95 percent relative humidity at
3.6.3.4 Fungus: The vacuum pump shall not be damaged by exposure to moist
fungus encountered at locations in tropical and subtropical climates.
3.6.3.5 Salt Air: The vacuum pump shall not be damaged by exposure to or
operation in an atmosphere containing salt-laden moisture.
3.6,3.6 Rain, Sleet, and Snow: The vacuum pump shall not be damaged by
storage or operation under adverse conditions of rain, sleet, or snow.
Power Unit: The power unit shall consist of an electric motor and
3.7
"Vee" belt drive system together with the controls, instruments and accessor-
ies needed for proper and safe operation.
Electric Motor: The motor shall be a 220 volt, 50-60 cycle,
3.7.1
3 phase drip proof unit conforming to Federal specification CC-N-641, The
motor size shall be such that the driven load will not exceed the continuous
duty rating of motor when the pump is operated under all design conditions
and at rated capacity on 60 cycle current. The motor continuous duty rating
when operating on 50 cycle current shall exceed the power consumed by the
pump when operated 5/6th of rated speed.
Motor Controls: All electric motor controls and protective de-
3.7.2
vices required for starting, stopping, overload protection, and under volt-
age protection shall be provided, A phase sequence control shall also be
provided to prevent the pump from operating in the wrong direction, The
phase sequence control shall either automatically reverse the phase sequence
when the flexible cable is connected to an electrical power source in the
wrong phase sequence or a separate manual phase reversing switch shall be
provided on the pump assembly which will permit reversing the phase sequence
without reconnecting the flexible cable.
Electric Power Cable: A 50-foot flexible 4-conductor, rough duty
3.7.3
cable of adequate capacity shall be provided, the cable shall be permanently
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