MIL-PRF-24755B(SH)
3.5.2 Identification plates. Permanent identification plates shall be mechanically fastened to the outside of the
fan casing. Identification plate mounting shall not interfere with fan casing tightness. The identification plate shall
contain the following information as a minimum:
a.
Manufacturer's name and CAGE code number
b.
Fan identification code
c.
Component identification number (CID No.)
d.
Direction of air flow and rotation
e.
Manufacturer's serial number and drawing number
The identification plate and a duplicate motor identification plate shall be installed on the outside of the fan casing.
TABLE I. Fan identification code.
Symbol Sequence 1/
Characteristics
Code
Meaning
1 (letter)
Type of fan
A
Vaneaxial
Nominal ft3/min. of
2 (number)
Fan size
For size code, see table II
standard air
3 (letter)
Type of current
A
AC
440 volts, 3-phase, 60 Hz
4 (number)
Voltage and phase
4
AC
5 (letter)
Motor enclosure
W
Spraytight
Maximum ambient
6
149 °F (65 °C)
6 (number)
temperature
7 (letter)
Nonmagnetic construction
NM
--
8 (letter)
Thermal protection
TP
--
9 (letter)
Quiet bearing
QB
--
NOTE:
1/
For example, A101A4W6-TP represents a Type A, nominal 1200 cubic feet per minute (ft3/min) vaneaxial
fan at 14-inch water gauge driven by a 440-volt (V), 60-Hertz (Hz), 3-phase, alternating current (AC)
spraytight, 149 °F (65 °C) ambient temperature, thermal protection Navy service A motor.
3.6 Interchangeability. In no case shall parts be physically interchangeable or reversible unless such parts are
also interchangeable or reversible with regard to function, performance, and strength.
3.7 Operating life. The equipment shall have an operating life of not less than 223,800 hours (equivalent to
approximately 30 years of operation). Any part identified as planned replacement parts shall have an operating life,
prior to replacement, of approximately 37,300 hours (equivalent to approximately 5 years of ship operation).
3.7.1 Reliability. Reliability shall meet the specified values (see 3.7).
3.8 Human engineering. The fan shall be arranged so as to achieve safe, reliable, and effective performance by
the operator and maintenance personnel and to minimize personnel skill requirements. ASTM F1166 may be
utilized as a guideline in applying human engineering design criteria for the fan-motor unit.
3.9 Maintainability. The fan shall be constructed so that:
a. Fan impeller shall be mounted on the motor shaft in such a manner that it is removable using commonly
available tools.
b.
Bearings shall be removable using commonly available tools.
5
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