Fmmmppt.ppt 111

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punps assosiated problems and their solutions

punps assosiated problems and their solutions

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  • 1.  
  • 2. DEPARTMENT OF MECHANICAL ENGINEERING
  • 3.
    • ADEEL HASSAN KHAN
    • MUHAMMAD HAIDER JAFRI
    • GHULAM AHMAD
    • MUZAMIL ARIF
  • 4.  
  • 5.
    • PUMPS
    • HOW PUMPS WORK
    • BASIC TYPES OF PUMPS
    • PROBLEMS OF PUMPS
    • SOLUTIONS OF PUMP PROBLEMS
    • SUMMARY
  • 6.
    • A pump is a mechanical device that changes mechanical power into fluid power.
    • Pumping is the addition of energy to a fluid .
    • Pumping action creates a partial vacuum while atmospheric pressure forces liquid up.
  • 7.  
  • 8.
    • Pumps work on a simple yet very effective mechanism.
    • They convert mechanical energy to fluid energy by pressurizing the fluid.
  • 9.
    • Positive Displacement Pumps
    • Centrifugal Pumps.
  • 10.  
  • 11.  
  • 12.
    • Of a number of problems, the major pump problems are:
    • Suction problem
    • System problem
    • Mechanical problem
  • 13.
    • Pump not primed
    • Pump suction pipe not completely filled with liquid
    • Suction lift too high
    • Insufficient margin between suction pressure and vapor pressure
    • Excessive amount of air or gas in the liquid
    • Air pockets in the suction line
  • 14.
    • Air leaks into the suction line
    • Air leaks into the pump through the stuffing box or gland
    • Foot valve too small
    • Foot valve partially clogged
    • Inlet of suction pipe insufficiently submerged
    • Water seal pipe plugged
    • Seal cage improperly located in stuffing box, preventing sealing fluid entering space to form a seal
  • 15.
    • Speed too low
    • Speed too high
    • Wrong direction of rotation
    • The total head of system higher than design pump head
    • The total head of system lower than design pump head
  • 16.
    • Specific gravity of liquid different from design
    • Viscosity of liquid differs from that for which the pump was designed
    • Operation at very low capacity
    • Parallel operation of pumps unsuitable for such operation
  • 17.
    • Foreign matter in the impeller
    • Misalignment
    • Foundations not rigid
    • Shaft bent
    • Rotating part rubbing on stationary part
    • Bearing worn
    • Wearing rings worn
    • Impeller damaged
    • Casing gasket defective, permitting internal leakage
  • 18.
    • Packing improperly installed
    • Incorrect type of packing for operating conditions
    • Shaft running off-center because of worn bearings or misalignment
    • Rotor out of balance, resulting in vibration
    • Gland too tight, resulting in no flow of liquid to lubricate the packing
  • 19.  
  • 20.
    • 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
  • 21.
      • Corrosion is the disintegration of an engineered material into its constituent atoms due to chemical reactions with its surroundings
  • 22.  
  • 23.
    • Better Sealing Devices
    • Component Modification
    • System Change
    • New Pump
    • Personnel Training
  • 24. ****Any Questions…!!!*** *** ***
  • 25.