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|  MIL-P-19131(SHIPS)
3.4.3.1 Materials for class N-4 and O-3 pumps shall be the same as listed
in table 1 except that commercial materials may be used in place of Navy specifi-
cation material.
3.4.3.2 Rotors for N-4 and O-3 pumps maybe of oil resistant rubber com-
pound subject to specific approval of the bureau or agency concerned.
3.5 Pump drivers. -
3.5.1 Pumps may be direct connected or geared to the driving units as
specified or approved in each case by the bureau or agency concerned, Attached
pumps, class O-3 and N-4, may be geared, chain driven or belt driven,
3. 5.3 Motors. - Motor drives shall be of the type and characteristics speci-
fied in the contract order and shall conform to Specification MIL-M- 17413 or
MIL-M- 17556 for direct current, motors, and to Specification MIL-M- 17059 or
MIL-M- 17060 for alternating current motors. Unless otherwise specified in the
contract or order motors shall have the following features:
(a)
Navy service
Service A.
(b)
Ambient temperature
50 c
(c)
Duty
Continuous.
(d)
Enclosure
Totally enclosed or totally
enclosed fan cooled.
(e)
Insulation
Class A or B.
(f)
Type of bearings
Ball.
Winding direct current or
shunt.
(9)
alternating current
Squirrel cage induction.
Design, alternating current
(h)
Design C.
The full load torque at all speeds of multispeed motors shall be
(i)
constant.
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