Unibloc-Pump 54001010P20H6010T12E, Руководство по эксплуатации и обслуживанию

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UNIBLOC-PD Operation & Service Manual: PD200-576 35
4.8 Troubleshooting
PROBLEM POSSIBLE CAUSE SOLUTION
A. No flow, but pump turns; pump
does not prime
1. Motor turning in wrong
direction
2. Air pocket in pipe or pump.
3. NPSHA too low.
4. Pump runs too slow.
5. Viscosity too high.
6. Obstruction in discharge piping,
valve closed.
1. Reverse motor.
2. Fill pipe and pump with liquid.
Check pipe fittings for leaks.
3. Increase suction pipe diameter or
shorten suction pipe length.
Decrease pump speed. Raise feed
tank or supply liquid level.
4. Increase speed.
5. Lower viscosity if possible.
6. Remove obstruction, open valve.
B. Capacity too low, but pump turns 1. NPSHA too low.
2. Pump runs too slow.
3. Increased slip in pump.
4. Discharge pressure higher than
expected.
5. Front cover not tight.
6. O-ring installed in front cover is
too thick.
1. See A-3
2. Increase speed.
3. Check rotor clearances; replace
worn parts if necessary.
4. Check discharge piping for
closed valves or obstructions. In-
crease pump speed BUT DO NOT
EXCEED PRESSURE LIMITS
OF PUMP. Increase discharge
pipe size. Increase pump size.
5. Tighten cover nuts to torques
specified in section 5.3.
6. Replace front cover o-ring with
correct size.
C. Pump is noisy, cavitating 1. Collapsed suction hose.
2. Liquid temperature too high.
3. Speed too high.
4. Viscosity higher than Expectected
5. NPSHA too low.
6. Suction side valve closed
1. Use reinforced hose or rigid
piping.
2. Reduce speed, increase NPSHA.
3. Decrease speed.
4. Decrease speed, increase pump
size.
5. See A-3.
6. Open valve, check suction side
piping for obstructions
D. Rotors gall, pump seizes 1. Liquid temperature too high.
2. Rotor clearances incorrect.
3. Loose rotor bolts/housing studs.
4. Bearings worn.
5. Gears worn.
6. Foreign particles in pump.
7. Particles in product too large.
8. Discharge pressure too high.
1. Lower temperature or increase
Rotor clearances.
2. Adjust to factory recommended
clearances.
3. Tighten or replace if necessary.
4. Replace bearings.
5. Replace gears.
6. Install suction side filter.
7. Increase rotor clearances. Use
plastic rotors. Increase pump size.
8. See B-4.