1900 Series Horizontal Splitcase Pumps
Instruction and Repair Manual
12
11/12/18
Allow the grout to fully cure before backing off the leveling nuts (if used) and firmly tightening the foundation bolts. Then
recheck the alignment before connecting the piping as even the highest quality nonshrink grouts contract slightly during
drying.
PlPING:
IMPORTANT:
All piping connections must be made with the pipe in a free supported state, and without the need to apply vertical or
side pressure to obtain alignment of the piping with pump flange.
All piping should be independently supported near the pump so that pipe strain will not be transmitted to the pump
casing. The weight of the piping and of the contained liquid must be considered in support design. The suction and
discharge piping should be one or two sizes larger than the pump flange sizes, especially where the piping is of
considerable length. Any flexible joints installed in the piping must be equipped with tension rods to absorb piping axial
thrust.
The suction pipe must be airtight and sloped upward to the pump flange to avoid air pockets which will impair
satisfactory pump operation. The discharge pipe should be as direct as possible with a minimum of valves to reduce pipe
friction losses.
A check valve and closing valve should be installed in the discharge line and a closing valve in the suction line. The check
valve, between the pump and closing valve, protects the pump from water hammer and prevents reverse rotation in the
event of power failure. The closing valves are used in priming, starting and when the pump is shut down. The pump must
never be throttled by the use of a valve in the suction line.
INITIAL COUPLING ALIGNMENT:
Check safety codes, and always install protective guard or shield as required by the various federal, state and local laws
and the regulations concerning OSHA.
The pump and driver were accurately aligned at the factory. However, it is impossible to maintain this alignment during
shipping and handling. Therefore it will be necessary for you to realign the pump and driver. Flexible couplings are not
universal joints. They should not be used to compensate for misalignment of the pump and motor shafts. Their function
is to transmit power from the driver to the pump while compensating for thermal expansion and shaft end movement.
The coupling faces should be far enough apart so that they do not make contact when the motor shaft is forced to the
limit of the bearing clearance toward the pump shaft.
In order to properly align the coupling, you will need a taper gauge or set of feeler gauges, and a straight edge.
There are two types of misalignment encountered with flexible couplings: angular misalignment, in which the shafts are
not parallel, and parallel misalignment where the shafts are parallel but not on the same axis.
To check angular alignment, insert a feeler gauge or taper gauge at any four places 90° apart around the coupling halves.
Insert shims under the driver feet until the same reading is obtained at all four check points. The pump and driver will
then be in angular alignment.
