MIL-P-18140(SHIPS)
3.3.7.2 Each horizontal pump and driving unit shall be mounted on a common bedplate.
3.3.7.3 Each vertical unit shall be base mounted or table mounted, as specified (see 6. 1).
3.3.7.4 For the base mounted units, the base may be either integral with the pump casing, or
a separate piece, and the base shall have provision for bolting to foundation,
3.3.7.5 For the table mounted units, the table mount may be either integral with the pump casing
or bracket, or it may be a separate piece.
3.3.7.6 A suitable bracket shall be provided between the pump and driver of vertical units.
3.3.7.7 Bedplates, bases, table mounts and brackets shall be of cast steel, class CW of Speci-
fication MIL-S-15083, or structural steel fabricated by welding, designed so that they shall be suffi-
ciently rigid to permit handling, shipment and installation of the unit onboard ship, without disturbing
the-alignment of the assembled units, and such that the normal distortion, weaving or vibration of the
supporting structures onboard ship cannot cause misalignment between the pumps and driving units.
3.3.7.8 Each component part of an assembled unit supported directly by the bedplate, base,
table mount, or bracket, shall be doweled thereto to facilitate reassembly and maintenance of alignment.
3.3.7.9 All bearing and seating surfaces of bedplates, bases, table mounts, or brackets shall be
finished machined.
3.3,7.10 In the event special bulkhead mounting is required, sideplates shall be furnished subject
to all the conditions specified for basepla tes.
3.3.7.11 Horizontal pumps shall be designed so that all bearings, rotors, and shafts may be
removed and replaced without disconnecting piping, except stuffing box gland seal piping, and without
removing the pump or its driving unit from the bedplate or base.
3.3.7.12 Each vertical unit, in order to facilitate interchangeability, shall be constructed to permit
rotation of the pump with respect to its driver. Eight or more positions of pump flanges relative to the
driver shall be available.
3.3.8 Bearings.-
3.3.8.1 Radial bearings. - Radial bearings may be of the rolling contact or sliding surface (sleeve)
type.
3.3.8.2 Rolling contact bearings for radial loads and the installation thereof shall be in accordance
with Specification FF-B- 171 and 42B10.
3.3.8.3 Sliding surface radial bearings may be of the fixed or self aligning type as approved for
design and application by the bureau or agency concerned. Ample bearing surface shall be provided
for each sleeve bearing.
3.3.8.4 Thrust bearings, - Pumps shall be designed to counteract any unbalanced hydraulic or
mechanical thrust under normal service condition, In this connection consideration shall be given to the
fact that the normal motion of a ship at sea or an abnormal list or trim giving an inclined operating
platform may introduce mechanical thrust in a unit which might otherwise be in satisfactory balance.
3.3.8.5 Thrust bearings may be of the straight thrust rolling contact, combined radial and thrust
rolling contact or plain sliding surface type.
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