MIL-P-18140(SHIPS)
3.3.8.6 Thrust bearings of the rolling cantact type and the installation thereof shall be in accord-
ance with Specifications FF-B-171 and 42B10, 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 sliding surface (sleeve) bearings are fitted in closed heads they maybe of the
solid bushing type secured by pins or keys, For independent bearings on brackets fitted at stuffing box
ends, the sliding surface bearings shall be split along the axis, All sliding surface bearings shall be so
arranged to permit renewal or refitting 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 align-
ment.
3.3.8.8.3 Bearing brackets shall be either cast integral with the casing, securely bolted to the
casing on a machined shoulder, or held in alignment with the casing by at least two heavy dowels and
securely bolted thereto. The use of bolts alone for securing brackets is prohibited.
3.3.8.9 Bearing lubrication. -
3.3.8, 9.1 Rolling contact or sliding surface bearings may be lubricated by the fluid pumped where
such bearings are located within the pump casing and are not separated by packed glands from the fluid
pumped, provided the bearing housings are so designed that there are no pockets, which may act as
water, sediment, or sludge traps and a continuous circulation of fresh oil is provided through such
bearings.
3.3.8.9.1. 1 Bearings lubricated by the fluid pumped shall be required to operate in a manner
satisfactory to the Bureau of Ships throughout the test specified in 4.2.7. 1; however deterioration to a
point requiring replacement of the bearings immediately after the test will not disqualify the bearings,
3.3.8.9.2 Externally mounted rolling contact bearings shall be lubricated in accordance with
Specification FF-B-171 or 42B10, as applicable.
3.3.8.10 The number, type and arrangement of bearings shall be as approved by the bureau or
agency concerned,
3.3.9 Piping and valves. -
3.3.9.1 All valves, flanges and fittings for pipe connections shall conform to Draw-
ing 50 CO-S4800-3000.
3,3. 9.2 All suction, discharge, and relief valve connections shall be flanged; the flanged connections
shall be in accordance with Drawings B-104, B-105, B-176, and B-177, as applicable, Suction and
discharge pressure gage connections shall be flanged; the flange connections shall be in accordance with
Drawing B-214.
3.3.9.3 Gland seal piping shall be 1/8 inch iron pipe size (i. p. s. ) extra heavy steel pipe, steel
valves, steel fittings and steel unions, all screwed.
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