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|  MIL-P-19131(SHIPS)
3.3.7.13 Each vertical class O-2 and N-2 unit, in order to facilitate
interchangeability, shall be constructed to permit rotation of the pump with
respect to its driver.
3.3.8 Bearings, -
3. 3.8.1 Radial bearings. - Radial bearings may be of the ball, roller or
sleeve type.
3. 3.8.2 Ball or roller bearings for radial loads and the installation thereof
shall be in accordance with Specifications FF-B-171 and FF-B- 185.
3. 3.8.3 Sleeve 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
hyraulic 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 mechani-
cal 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.
3.3.8.6 Thrust bearings of the rolling contact type and the installation thereof
shall be in accordance with Specifications FF-B- 171 and FF-B-185, as applicable.
3. 3.8.7 Sliding surface thrust bearings shall be as approved for design and
application by the bureau or agency concerned..
3.3.8.8 Bearing installation. -
3.3.8.8.1 Where sleeve bearings are fitted in closed heads they may be of the
solid bushing type secured by pins or keys. For independent bearings on brackets
fitted at stuffing box ends, the sleeve bearings shall be split along the axis. All
sleeve bearings in class O-2 and N-2 pumps shall be so arranged to permit renewal or
ref itting without removal of the pump rotor from the casing, and they shall be
securely fitted to prevent axial movement.
3.3.8.8.2 For either internally or externally mounted bearings, the bearing
housing shall be cast integral with the pump case or bearing bracket, or secured
thereto in such a manner as to insure alignment.
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