MI L- P-24475 (S HIPS)
3.2.3.3.4 For vertical flexible coupled pumps, thrust bearings shall be installed at
the top, external of the pump, between the coupling and the stuffing box, For close coupled
pumps , the thrust bearing shall be located in the driver and shall comply with all require-
ments stated herein.
3.2.4 Lubrication.
3.2.4.1 The lubrication of ball bearing shall be with grease or oil as specified in
MIL-G-18709 and MIL-L-17331, in accordance with FF-B-171.
3.2.4.2 All thrust bearing housings shall be so designed that the thrust bearings
will be adequately lubricated immediately when the shaft starts to turn,
3.2.5 Piping and valves.
3.2.5.1 All valves, flanges, fittings and bolting shall conform to MIL-STD-777 for
surface ships and as specified (see 6.1) , except tapered pipe threads are acceptable for
use in grease fittings and nonpressurized connections. Fittings not covered by these
specifications for application where ship connections are not involved shall be approved
by the procuring agency (Government or shipbuilder).
3.2.6 Pump units which are required to be self-priming shall be of a type approved
by NAVSEC.
3.2.7 Motors.
3.2.7.1 All motors for driving pumps shall be of the types and characteristics
specified in the contract or order and shall conform to MIL-M-17413 or MIL-M-17060 as
specified (see 6.1).
3.2.7.2 Motors shall be service A or service C as specified (see 6.1).
3.2.7.3 The horsepower (hp.) rating of each motor shall be not less than the maximum
brake hp. of the driven pump under any conditions from shut-off to free delivery and shall
be demonstrated on the performance curve, carried out to free delivery. The actual motor
rating shall be in accordance with the Navy standard motor ratings as indicated in the
applicable motor specification (see 3.2.7.1).
3.2.8 Controllers. All motor controllers shall be of the characteristics specified
(see 6.1) and shall conform to MIL-C-2212.
3.2.9 Shock and vibration.
3.2.9.1 Pumps and drivers with all appurtenances and controls shall be capable of
passing a shock test in accordance with MIL-S-901 as specified in 4.3.3.2.
3.2.9.2 Shock mounts (resilient mounts for shock attenuation) shall not be used.
When noise attenuation mounts are specified, the pumps shall be designed to pass the shock
test on the noise attenuation mounts.
3.2.9.3 Bolts designed to be stressed in shear shall be installed in holes with a
minimum of clearance. Hole diameters shall be no more than 1/32 inch larger than the
bolts for sizes up to and including 3/4 inch, and no more than 1/16 inch larger than bolts
of greater than 3/4 inch size. Mounting bolts for fastening the equipment shall conform
to grade 2 or better of MIL-B-857.
3.2.9.4 Pump units shall not be damaged or caused to malfunction either by the environ-
mental vibrations specified in MIL-STD-167, or by internally excited vibrations. In lieu
of the limits specified in MIL-STD-167, for internally excited vibration, the maximum
allowable vibration (double amplitude) shall not l xceed 0.001 inch as measured on the bear-
ing cap or 0.002 inch as measured on the rotating shaft adjacent to the bearing environmental
vibration frequencies shall be as specified (see 6.1).
3.2.9.5 The design, construction and workmanship of the equipment shall be such that
noise levels under all conditions of operation will meet the l irborne noise, fluidborne
noise and structureborne vibration requirements as specified (see 6.1).
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