MIL-PRF-19004B
3.3.2 Welding and allied processes. Surfaces of parts to be welded or brazed
shall be free from rust, scale, paint, grease, and other foreign matter.
Welding and allied processes shall be performed by personnel certified to
American Welding Society standards. NAVSEA Technical Publication S9074-AR-
GIB-010/278 may be used for guidance.
3.4
Identification.
3.4.1 Fan identification code. The size and characteristics of Navy standard
fan motor units shall be designated by a code formed by alternate letters and
numbers arranged in the following sequence:
Symbol sequence
Characteristics
Code
Meaning
1 (letter(s))
Type of fan
See 1.2
-
2 (number)
Fan size
For size codes, Nominal cubic feet per
3
see Table I
minute (ft /min) of
standard air in
thousands 3
(2=2000 ft /min)
Type of current:
3 (letter)
A
Alternating current
(ac)
4 (number)
Voltage and phase
4
440-Volt (V), 3-phase
ac, 60 Hz
5 (letter)
Motor enclosures:
W
Spraytight
X
Explosion-proof
o
6 (number)
Maximum ambient temp
6
149 F (65 °C)
7 (letter(s))
Non-magnetic structure
NM
(This part of the
of fan and motor
seventh symbol is
omitted unless
applicable.)
Rotation, centrifugal
---
fans, (viewed from
drive side)
- clockwise
CW
- counterclockwise
CCW
Non-sparking
NS
---
construction
Acid resisting paint on
AR
air handling parts
---
Watertight construction
WT
---
8 (letter(s))
Quiet bearings
QB
Meets MIL-B-17931
Examples:
3
1.
CC5A4W6CW-NS-WT represents a nominal 5000 ft /min centrifugal, non-
sparking watertight construction fan, clockwise rotation, driven by
a 440-V, 3-phase, 60 Hz ac, spraytight, 149 °F ambient temperature
motor. Navy standard fans with special electrical characteristics
shall have shortened fan codes, with electrical characteristics
identified by text and preceded by the letter "S".
3
2.
X-CC6A4W6CCW represents a nominal 6000 ft /min centrifugal fan,
counterclockwise rotation, with commercial motor, driven by a 440-V,
3-phase, 60 Hz ac, 149 °F ambient temperature motor.
5
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