Xylem Bell & Gossett VTP Serie Manual De Instrucciones página 29

TROUBLE
6. Pump takes too much
power
7. Pump is too noisy
8. Excessive vibrations
9. Pump leaks excessively
at stuffing box
10. Stuffing box is
overheating
11. Packing wears too fast
TROUBLESHOOTING
PROBABLE CAUSE
A. Damaged impeller
B. Foreign object lodged between
impeller and bowl
C. Specific gravity higher than
pump designed for
D. Viscosity too high, partial
freezing of pumpage
E. Defective bearing
F. Packing is too tight
A. Cavitation
B. Bent shaft
C. Rotating parts binding, loose
or broken.
D. Bearings are worn out
E. Resonance
A. Coupling misalignment, bent
impeller unbalance, worn
bearings, cavitation, piping
strain and/or resonance
B. Motor or gear driveshaft end
play maladjustment
C. Bent shaft
D. Crooked well.
A. Defective packing
B. Wrong type of packing
A. Packing is too tight
B. Packing is not lubricated
C. Wrong grade of packing
D. Stuffing box improperly packed
A. Shaft or shaft sleeve worn
B. Insufficient or no lubrication
C. Improperly packed
D. Wrong grade of packing
REMEDY
Inspect, replace if damaged.
Remove object as required.
Test liquid for viscosity and
specific gravity.
Check for both. They can cause
drag on impeller.
Replace bearing, check shaft or
shaft sleeve for scoring.
Release gland pressure.
Retighten. (See page 15.) Keep
leakage flowing. If no leakage,
check packing, sleeve or shaft.
Same as Item 3-E.
Straighten as required. See
Page 13 for runout limits.
Replace as required.
Replace bearings.
Check piping strain, consult factory.
Determine cause utilizing shaft
vibration frequency analyzer
and/or pump disassemble.
Complex problem may require
factory service assistance.
See Installation of Hollow Shaft
Driver (VHS), Page 19.
Straighten as required. See
Page 13 for runout limits.
Survey the well and consult factory.
Replace worn packing.
Replace packing not properly
installed or run-in. Replace
improper packing with correct
grade for liquid being pumped.
See item 6-F.
Release gland pressure and
replace all packing if burnt or
damaged. Re-grease packing
as required.
Consult factory.
Repack stuffing box.
Pull pump and remachine, or
replace shaft and/or sleeve.
Repack and make sure packing
is loose enough to allow some
leakage.
Repack properly, make sure all
old packing is removed and
stuffing box is clean.
Consult factory.
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