Fmmmppt.ppt 111

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punps assosiated problems and their solutions

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Fmmmppt.ppt 111

  1. 2. DEPARTMENT OF MECHANICAL ENGINEERING
  2. 3. <ul><li>ADEEL HASSAN KHAN </li></ul><ul><li>MUHAMMAD HAIDER JAFRI </li></ul><ul><li>GHULAM AHMAD </li></ul><ul><li>MUZAMIL ARIF </li></ul>
  3. 5. <ul><li>PUMPS </li></ul><ul><li>HOW PUMPS WORK </li></ul><ul><li>BASIC TYPES OF PUMPS </li></ul><ul><li>PROBLEMS OF PUMPS </li></ul><ul><li>SOLUTIONS OF PUMP PROBLEMS </li></ul><ul><li>SUMMARY </li></ul>
  4. 6. <ul><li>A pump is a mechanical device that changes mechanical power into fluid power. </li></ul><ul><li>Pumping is the addition of energy to a fluid . </li></ul><ul><li>Pumping action creates a partial vacuum while atmospheric pressure forces liquid up. </li></ul>
  5. 8. <ul><li>Pumps work on a simple yet very effective mechanism. </li></ul><ul><li>They convert mechanical energy to fluid energy by pressurizing the fluid. </li></ul>
  6. 9. <ul><li>Positive Displacement Pumps </li></ul><ul><li>Centrifugal Pumps. </li></ul>
  7. 12. <ul><li>Of a number of problems, the major pump problems are: </li></ul><ul><li>Suction problem </li></ul><ul><li>System problem </li></ul><ul><li>Mechanical problem </li></ul>
  8. 13. <ul><li>Pump not primed </li></ul><ul><li>Pump suction pipe not completely filled with liquid </li></ul><ul><li>Suction lift too high </li></ul><ul><li>Insufficient margin between suction pressure and vapor pressure </li></ul><ul><li>Excessive amount of air or gas in the liquid </li></ul><ul><li>Air pockets in the suction line </li></ul>
  9. 14. <ul><li>Air leaks into the suction line </li></ul><ul><li>Air leaks into the pump through the stuffing box or gland </li></ul><ul><li>Foot valve too small </li></ul><ul><li>Foot valve partially clogged </li></ul><ul><li>Inlet of suction pipe insufficiently submerged </li></ul><ul><li>Water seal pipe plugged </li></ul><ul><li>Seal cage improperly located in stuffing box, preventing sealing fluid entering space to form a seal </li></ul>
  10. 15. <ul><li>Speed too low </li></ul><ul><li>Speed too high </li></ul><ul><li>Wrong direction of rotation </li></ul><ul><li>The total head of system higher than design pump head </li></ul><ul><li>The total head of system lower than design pump head </li></ul>
  11. 16. <ul><li>Specific gravity of liquid different from design </li></ul><ul><li>Viscosity of liquid differs from that for which the pump was designed </li></ul><ul><li>Operation at very low capacity </li></ul><ul><li>Parallel operation of pumps unsuitable for such operation </li></ul>
  12. 17. <ul><li>Foreign matter in the impeller </li></ul><ul><li>Misalignment </li></ul><ul><li>Foundations not rigid </li></ul><ul><li>Shaft bent </li></ul><ul><li>Rotating part rubbing on stationary part </li></ul><ul><li>Bearing worn </li></ul><ul><li>Wearing rings worn </li></ul><ul><li>Impeller damaged </li></ul><ul><li>Casing gasket defective, permitting internal leakage </li></ul>
  13. 18. <ul><li>Packing improperly installed </li></ul><ul><li>Incorrect type of packing for operating conditions </li></ul><ul><li>Shaft running off-center because of worn bearings or misalignment </li></ul><ul><li>Rotor out of balance, resulting in vibration </li></ul><ul><li>Gland too tight, resulting in no flow of liquid to lubricate the packing </li></ul>
  14. 20. <ul><li>Cavitation is the formation of vapour bubbles of a flowing liquid in a region where the pressure of the liquid falls below its vapor pressure </li></ul>
  15. 21. <ul><ul><li>Corrosion is the disintegration of an engineered material into its constituent atoms due to chemical reactions with its surroundings </li></ul></ul>
  16. 23. <ul><li>Better Sealing Devices </li></ul><ul><li>Component Modification </li></ul><ul><li>System Change </li></ul><ul><li>New Pump </li></ul><ul><li>Personnel Training </li></ul>
  17. 24. ****Any Questions…!!!*** *** ***

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