for the backstop device. The lubricant for the antireverse device shall
contain a corrosion inhibitor, whose type and grade shall be shown on a
special nameplate attached to the frame of the motor adjacent to the
lubricating filling device.]
2.1.2.8
[Power Factor and Efficiency
**************************************************************************
NOTE: List power factor and efficiency for each
size only if high efficiency motors are required.
Generally manufacturers' standards will be used.
**************************************************************************
The power factor and efficiency at full load, 3/4 full load, and 1/2 full
load shall be not less than [_____], [_____], [_____] and [_____], [_____],
[_____], respectively. Motors will be rejected if factory tests specified
in paragraph FACTORY TESTS do not demonstrate that these values will be met
or exceeded.]
2.1.3
Frames and Brackets
Frames and end brackets shall be of cast iron, cast steel, or welded steel.
The mounting ring, unless otherwise approved, shall be built integral with
the frame or lower end bracket. Contractor shall coordinate the motor
installation with the mounting arrangement specified in Section 15131A
VERTICAL PUMPS: AXIAL-FLOW AND MIXED-FLOW IMPELLER-TYPE, paragraph BASE
PLATE AND SUPPORTS. All equipment and materials required to mount the
motor, such as a base or pedestal, sole plates, and bolts or dowels, shall
be furnished by the Contractor. Sufficient bolts and dowels shall be
installed to prevent any possible movement of the motor assembly when the
motor is subjected to stresses resulting from the most severe short-circuit
conditions. Treatment against corrosion shall be as specified in paragraph
GENERAL REQUIREMENTS.
2.1.3.1
Stator Frame
The stator frame shall be rigid and sufficiently strong to support the
weight of the upper bearing bracket load, the weight of the stator core and
windings, and to sustain the operating torques without perceptible
distortion.
2.1.3.2
Supporting Brackets
The upper bracket supporting the thrust bearing and upper guide bearings
shall have sufficient strength and rigidity to support the weight of the
entire rotating element of the motor, together with the pump impeller and
shaft, and the unbalanced hydraulic thrust of the pump impeller. The lower
bracket supporting the lower guide bearing shall preferably be so designed
and constructed that the entire rotor can be lifted out as a unit without
disturbing the bearing alignment. If it is not feasible to construct the
rotor so that it can be lifted out as a unit, then the lower bracket shall
be supported on separate base plates or structure and shall be designed so
that it can be removed through the stator. The maximum deflection of the
thrust bearing support system at any point shall not exceed the limits set
by the pump manufacturer to maintain proper clearances for any operating
condition.
SECTION 16222A
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