OMAC B Series, Installation, Operation And Maintenance Manual

Page: 13 / 52

13
6. - TROUBLE SHOOTING GUIDE
No flow Insuf
ficient flow
Irregular flow Pump loses prime Pump blocks as soon as it starts Pump gets overheated Motor gets overheated Pump absorbs too much power Pump is noisy or vibrates Rotors wear out Seals wear out quickly Pump seizes
INCONVENIENCES
CAUSES
R E M E D I E S
Wrong rotation direction 1. Invert it
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Unprimed pump
2. Fill pumping chamber and feeding piping with liquid, expelling
air
3. Increase flushing height, enlarge suction piping diam, reduce
suction piping lenght and bends, reduce pump speed and medium
Not enough flushed
temperature, check the viscosity increase is suitable to motor
power
Air enters inlet
5. Check and tighten suction piping connections, tighten the packing
gland, if necessary replace it
Product evaporates at inlet 4. Remedies as per par. 3
Air is in suction
6. Remedies as per par. 2
piping
Not enough flushed in
7. Increase product level, lower suction opening position
suction container
Dirty or blocked valve or
8. Clean them
suction filter
Excessive product viscosity
9. Reduce pump speed, increase product temperature
Insufficient product viscosity 10. Increase pump speed, decrease product temperature
Excessive product temperature 11. Decrease product temperature, cool pumping chamber
Insufficient product temperature
12. Increase product temperature, heat pumping chamber (within the
limits given by manufacturer)
Suspended particles in 13. Clean suction pipe, arrange on inlet a filter
product
14. Remove possible obstructions in outlet piping, clean it,
Excessive back pressure enlarge its diam., reduce lenghts and bends of outlet
piping
Too tight packing 15. Loosen packing gland and tighten it rightly (see instructions)
Too loose packing 16. Tighten packing gland rightly (see instructions)
Insufficient seal liquid 17. Check liquid flow and if necessary increase it
Excessive pump speed 18. Decrease pump speed
Insufficient pump speed 19. Increase pump speed
Press on rotor 20. Check piping alignment, insert flexible joints, sustain piping
case
Belt slips
21. Strech it
Not alined joint 22. Adjust alignment between pump and drive device
Pump or drive device not
23. Tighten anchor bolts, re-checking alignment
fixed on base
Worn out bearings
24. Have them replaced by manufacturer
Worn out or unsynchronized 25. Replace them or adjust them according to manufacturer's
gears instructions
Wrong quantity or quality
26. Act according to manufacturer's instructions
of gear oil
Parts in touch rotor case 27. Check plan pressure and duty pressure, contact manufacturer
Worn out rotors 28. Replace them
Check valve leaks
29. Check valve adjustment, check and clean sealing devices, if
necessary replace parts
Check valve vibrates 30. Check valve adjustment (see instructions), check and clean valve
31. Adjust spring compression, so that valve opens with a pressure
Check valve is bad adjusted
over 10% of duty pressure.
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