DESMI PUMPING TECHNOLOGY A/S P a g e | - 62 -Tagholm 19400 Nørresundby - DenmarkPhone.: +45 96 32 81 11Fax : +45 98 17 54 99E-mail: desmi@desmi.comwww.desmi.com18. TroubleshootingProblem:8. Lack of co-ordination between pressure and capacity7. The pump cannot self-prime86. The pump loses liquid after self-priming75. The capacity is too low64. The pump is making a noise53. The motor is overloaded42. The pump has jammed31. The pump wears quickly2Cause: 11. Too great a vacuum X X X X2. Cavitation X X X3. Viscosity too high X X X X X4. Temperature too high X X X5. The pump is drawing air X X X X X6. Pressure too high X X X X7. Defective valve X X X8. The pump is corroded X X X9. The pump is worn X X10. Impurities in the pump X X X11. The stuffing box is over-tightened* X X12. Fault in the motor X13. Pipe too constricted or blocked X X14. Wrong speed X15. The pump runs without liquid X X X16. Liquid temp. too high – lack of lubricant X X17. Speed too low X18. Speed too high X X19. Suction line not dipped in liquid X20. Liquid being fed above liquid level X21. Valve incorrectly adjusted X22. The pump’s shaft end is bent X X23. Coupling incorrectly aligned X X24. Pump twisted in relation to pipe system X X X X25. Leaking pipes/assemblies XFigure 41:Various problems that can arise and possible causes of the problems.*Point 11 does not apply for pump type ED.
