Vaughan Triton Series, Инструкция по установке, эксплуатации и обслуживанию

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Form V453 - 8 - Rev 2, ECN 4735 10/16/20
slurries, contaminated water, or shear-
sensitive slurries may be pumped with less
power than with other types of non-clog
pumps. Vaughan Triton pumps are routinely
used to pump the following slurries:
1.
Flume and wash water in food
processing plants.
2. Sewage and sewage sludges.
3. Vegetable waste.
4. Mill scale.
5. Oil sludges in oil refineries.
6. Plastic debris.
7. Coal slurry.
System design is very important in making any
pump work successfully in debris-laden slurries.
There must be enough liquid so that liquid and
material are able to flow freely to the pump. The
piping must be properly designed to be large
enough to reduce friction losses, yet small
enough to ensure sufficient velocity to keep
particles suspended.
C. USES OF VAUGHAN PUMPS THAT MAY
CAUSE TROUBLE
If the system is not designed correctly for
proper handling of your material, or if the
pump is incorrectly chosen for your system,
the pump may not work to your satisfaction or
the pump may experience early failures of
seals, bearings, or wet-end components due
to cavitation and the resulting vibration.
Vibration will damage mechanical seals and
bearings fairly quickly.
Common rules of thumb include:
1.
Screw-centrifugal pumps must not ever
be operated with closed suction and
discharge valves. This will destroy the
pump and may be dangerous to
personnel.
2. A pump must be operated in the safe
portion of its pump performance curve.
Operation in the dashed lines indicates
vibration areas and must be avoided.
3. Operating a Triton pump against a
throttled discharge valve or against high
head will damage pumps.
4. Never control flow by throttling a pump
suction valve.
5. When pumping liquid containing debris
that floats or settles in a pit, mixing with
the pump may be required before pit
pumpout. This can be done by initially
directing the discharge back into the pit
using a 3-way valve system available
from Vaughan Co.
6. Slurry that is too hot cannot be pumped
from an open pit. A reasonable limit at
1170 RPM is about 180° F, at 1750 RPM
it’s about 160° F.
7. A reliable and properly sized electrical
supply must be installed for the pump to
work properly. If there is too much
voltage drop because of an undersized
cable or transformer, the motor will not
be able to provide full power to the pump
and it may stall during operation.
8. Wet-well level control can be troublesome
in solids handling applications. Some
users simply allow the pump to run
continuously, with the pump snoring a
combination of air and liquid at low pit
levels. This mode of operation can lead to
seal and bearing failures and is not
recommended.
Vaughan Co. has
available a low-current shut-off system
that eliminates the need for a low-level
float switch. Do not use a throttle valve to
operate a pump at or near shutoff head at
low pit levels, as this can lead to seal
failures and broken shafts.
D. EXPECTED BENEFITS OF VAUGHAN
PUMPS
Most customers who install a Vaughan pump
see several advantages:
1. Minimal pump attention is required.
2. Excellent pumping efficiency, meaning that
the same job can be done as with other
pumps, but using less power.
3. Gentle pumping of shear sensitive slurries.
4. Long and reliable life of the Vaughan
pump.
5. Wet-well pumps use standard T-frame AC
electric motors, which are cost-effective
and relatively easy to replace compared to
special-purpose submersible motors used
on submersible pumps.
6. Wet-well pumps eliminate suction piping
and damage to submerged wires typical of
submersible pumps.