MIL-PRF-19004B
3.4.2 Identification plates. Each fan shall be provided with a permanently
attached corrosion-resistant identification plate. The method of attachment
of the identification plate shall be corrosion-resistant. The identification
plate shall contain the following information:
a.
Manufacturer's identification.
b.
Fan code.
c.
CID number.
d.
Direction of airflow and rotation.
e.
Manufacturer's serial number and drawing number.
f.
Bearing Lubrication.
3.5 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.
3.6 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).
3.6.1
Reliability.
Reliability shall meet specified values (see Appendix C).
3.7 Human engineering. The fan shall be arranged so as to achieve safe,
reliable, and effective performance by the operator and maintenance personnel
and to optimize personnel skill requirements, ASTM-F-1166 may be utilized as a
guideline in applying human engineering design criteria for the fan-motor
unit.
3.8
Maintainability.
The fan shall be constructed so that:
a.
Fan impeller and motor may be removed from the fan scroll without
disconnecting the fan scroll from the discharge or intake ducts.
b.
Fan impeller and bearings are removable using commonly available
tools.
3.9 General shipboard design conditions.
General shipboard design
characteristics shall be as follows:
a.
Power source quality - In accordance with MIL-STD-1399, Sect 300.
b.
Able to operate satisfactorily in a weather air intake of a ship
when exposed to soaking atmospheric spray (rain or sea) or seawater.
c.
Perform in accordance with requirements herein under ambient
o
temperatures between 20 °F and 149 F.
3.9.1 High impact shock resistance. Unless otherwise specified (see 6.2),
Type CC fan-motor units shall meet the shock requirements of MIL-S-901 for
Grade A, class 1 equipment.
3.9.2 Vibration and balance. Fan-motor units shall be designed such that no
damage will occur or malfunction is caused by the environmental vibrations
specified in MIL-STD-167-1. Fan-motor units shall be in static and dynamic
balance. The vibration amplitude shall not exceed the limits for type II
bearing vibration as specified in MIL-STD-167-1.
3.10 Configuration. Fans and motor shall be suitable for operation in
horizontal (on ship axis or athwartship) or inclined position whether
installed on deck or suspended from the deck above.
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