thrust load plus the static load while operating under maximum rated pump
conditions. The thrust bearing shall be capable of withstanding without
injury the pump being started normally without prior jacking of the rotor.
The thrust bearing shall have a removable runner and shall be arranged to
permit adjustments, dismantling, and assembly of the runner and shoes
without disturbing the stator or rotor, other than jacking the load from
the bearing. A spacer plate between the thrust bearing runner plate and
the thrust block will not be permitted.
2.1.11.2
Guide Bearings
Except as permitted below, the motor shall be provided with two guide
bearings, one located above the rotor and the other below the rotor. The
guide bearings shall be capable of withstanding all stresses incident to
the normal operation of the unit [and to the maximum runaway speed]. Both
guide bearings shall be self-cooled, of the oil-immersed, self-oiling type,
and adequate provision shall be made for preventing oil or oil vapor from
entering the motor cooling system. The guide bearings shall be of the
split-sleeve type and shall be designed and constructed so that they can be
dismantled without disturbing the thrust bearing or the motor rotor. If
desired, the Contractor may combine the thrust bearing and the upper guide
bearing into a combination integral guide and thrust bearing assembly in a
common housing. In such a combination bearing, the vertical side of the
thrust-bearing block, but not the runner plate, shall be used as the
journal surface.
2.1.11.3
Lubrication
The lubricating oil used shall contain a corrosion inhibitor. Type and
grade of lubricant used shall be shown on a special nameplate which shall
be attached to the frame of the motor adjacent to the bearing filling
device. In addition to the quantity of lubricant required to initially
fill the system, spare lubricant shall be furnished in sufficient quantity
to purge and refill the system. Each lubrication system shall include oil
reservoirs, oil-level sight gauge, oil piping, valves, and necessary
appurtenances.
2.1.11.4
Housing
Bearing housing shall be of a design and method of assembly that will
permit ready removal of the bearings, and prevent escape of lubricant and
entrance of foreign matter. The bearings shall be protected by the
lubricant when the motor is idle. Suitable means shall be provided to
apply and drain the lubricant.
2.1.11.5
Cooling
Each thrust bearing shall be self-cooling whenever possible. When required
by motor speed or load, an oil cooler with suitable coils of
corrosion-resisting metal shall be provided in the oil reservoir and shall
be of sufficient capacity to maintain the oil at the proper temperature
with [30 percent glycol] cooling water entering the coils at a temperature
of [30] [_____] degrees C and with a minimum pressure of 40 pounds per
square inch. The cooler shall be designed for safe operation at a maximum
working pressure of 50 pounds per square inch and shall be subjected at the
factory to a hydrostatic test pressure of 75 pounds per square inch for a
period of one hour without leakage. Cooling water will be supplied by a
central system, furnished by others, consisting of a radiator, circulating
water pump, and piping system terminating at the exterior of each motor.
SECTION 16222A
Page 20
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