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|  MIL-P-18472G(SH)
3.2.5 Noise.
The construction of the equipment shall be such that noise
levels during operation at the design conditions will meet the airborne noise
and structureborne vibration noise requirements as specified (see 4.6.1.4 and
6.2).
3.2.6 Mounting.
Pump units shall be horizontally or vertically mounted, as
specified (see 6.2).
3.2.6.1 Horizontal. Each horizontal flexible coupled pump and separable
driving unit, complete with all appurtenances, shall be mounted on a common
bedplate.
3.2.6.1.1 Bedplates. Bedplates shall be cast steel or structural steel
fabricated by welding and rigid to permit handling, shipment, and installation
of the units on board ship, to minimize misalignment of the assembled units; and
such that normal distortion, weaving or vibration of the supporting structures on
board ships cannot cause misalignment between the pumps and driving units.
Bearing and seating surfaces of bedplates shall have finish machined surfaces.
3.2.6.1.2 Assemblies.
Each component part of an assembled flexible coupled
unit supported directly by a bedplate shall be doweled thereto to facilitate
reassembly and maintenance of alignment, except that final doweling of the driver
shall be performed by the installing activity after final installation. The
contractor shall furnish a warning plate indicating the above.
3.2.6.2 Vertical. Vertical pumps shall be base mounted or center of
gravity mounted. The base and support bracket shall have provisions for bolting
to a foundation. Pumps which are resiliently mounted shall be supported as close
to the center of gravity as practical.
3.2.6.2.1
Sideplates.
In the event special bulkhead mounting is required,
sideplates shall be furnished subject to all conditions specified for bedplates
(see 3.2.6.1.1 and 3.2.6.1.2).
When motor driven pumps of the close-coupled type
3.2.6.2.2 Assemblies.
are specified, bedplates will not be required, except as otherwise specified
(see 6.2). Each pump shall be provided with a support for bolting to the
foundation to augment the support from the motor frame.
3.2.7 Bearings.
Bearings shall be installed in each pump unit for
counteracting any unbalanced hydraulic or mechanical thrust in either direction
and the fact that rolling, pitching, listing and trim, and the athwartships, fore
and aft, and the vertical distance from the pump to the ship's rolling and
pitching center may introduce loads even though the unit is in hydraulic balance
(see 6.2). The contractor shall calculate the resulting static and dynamic loads
on the bearings (see 6.3).
3.2.7.1
Bearing types and mounting . Bearings shall be rolling contact
bearings (see 3.2.7.2) or, for radial bearings only, water-lubricated bearings
(see 3.2.7.3), or thrust bearings (see 3.2.7.4).
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