General Description - Xylem Goulds VIT Instrucciones De Instalación, Operación Y Mantenimiento

Uncontrolled Long Term Storage Preparations
When applicable to the pump, storage periods over six
months require the preceding storage procedure and
storage preparation plus the following:
Inspect the lube oil and seal flush piping and either
fill the piping with rust preventative oil, or re-coat the
piping periodically to prevent corrosion.
Place 10 pounds (4.5 kg) of moisture absorbing desiccant
or 5 pounds (2.3 kg) of vapor phase inhibitor crystals
near the center of the pump. If the pump is assembled,
place an additional one pound (0.5 kg) in the discharge
nozzle securely fastened to the discharge elbow.
Install a moisture indicator near the perimeter of the
pump. Cover the pump with 6 mil (0.15 mm) minimum
thickness black polyethylene or equal and seal it with
tape. Provide a small ventilation hole approximately
½ inch (12 mm) diameter.
Provide a roof or shed shelter to protect from direct
exposure to the elements.

GENERAL DESCRIPTION

The model VIT pump is a vertical turbine lineshaft
pump, which is designed to meet wide ranges of service
with maximum dependability. See Figure 1 or Figure 2
for open lineshaft pump and Figure 3 and Figure 4 for
enclosed lineshaft pump.
Drivers
Hollow shaft motors or right angle gear drives, are often
used with a separate head shaft through the driver and
connected to the pump by a threaded coupling.
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Discharge Head
The discharge head is either a cast iron head or a
fabricated head. Ports are provided for connecting the
pressure gauge, stuffing box bypass return and lubricator
connections. The driver support portion of the discharge
head is designed with large windows for easy stuffing box
or tension plate adjustment. The windows are covered
with guards for safe operation.
Column
Threaded or flanged column construction provides
positive shaft and bearing alignment. Bearings are spaced
to provide vibration free operation away from the
shaft critical speed in order to insure long bearing life
and reduced shaft wear. For open lineshaft, the shaft is
supported within the column by using bearing retainers
in the column assembly. For enclosed lineshaft, the
bearings are also the tube couplings of the shaft-enclosing
tube. The shaft-enclosing tube is stabilized in the column
pipe by tube stabilizer.
Bowl Assembly
The bowls are generally of flanged construction for
accurate alignment and ease of assembly and disassembly.
Impellers may be either open or enclosed depending on
the design requirements. They are fastened to the pump
shaft by taperlocks. For temperatures over 140º F
(60º C) and in the larger size bowls (over 18"), impellers
are keyed to the shaft. A special first stage low NPSH
impeller may be provided on some pump for certain
special application.
Thrust Pot
A thrust pot is utilized when the driver is not designed to
carry the pump thrust.