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Would you state some machines's failure modes ?

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Question added by LABIB KOOLI , Director of the Sectoral Center for Training in Hotel Technologies at Southern Hammamet , Tunisian Vocational Training Agency (ATFP)
Date Posted: 2015/01/28
Mustafa Al-Mulla
by Mustafa Al-Mulla , Mechanical Engineer , NSH Nasser Saeed Al Hajri

here are many machines failures  that happens in  industry which is  involved mechanical, problem ,structural problem .Electrical problems and etc... .

the list below are the damage mechanisms that is affecting Fixed Equipment in the  Refining Industry:

  1. Sulfidation 

  2. Wet H2S damage( blistering / HIC / SOHIC / SSC )

  3. creep(stress rupture)

  4. High temperature H2 / H2S corrosion

  5.  Polythionic Acid Corrosion

  6. Naphthenic Acid Corrosion

  7. Ammonium  Bi-sulfide Corrosion

  8. Ammonium Chloride Corrosion

  9. HCL Corrosion

  10. High Temperature Hydrogen Attack

  11. Oxidation

  12. Thermal Fatigue

  13. Sour water Corrosion (acidic)

  14. Refractory Degradation

  15. Graphitization

  16. Temper Embrittlement

  17. Decarburization

  18. Caustic Cracking

  19. Caustic Corrosion

  20. Erosion(Erosion corrosion)( is related to speed of the fluid inside pipeline system ,in general)

  21. Carbonate SCC

  22. Amine Cracking 

  23. Chloride Stress Corrosion Cracking

  24. Carburization

  25. Hydrogen Embrittlement (common in welding)

  26. Steam Blanketing

  27. Thermal Shock

  28. Cavitation (this phenomena happened in fluid pipelines when the pressure of fluid reaches to the specified pressure which the fluid can be evaporated at its temperature)

  29. Graphitic Corrosion ( Dealloying)

  30. Short term overheating - stress Rupture

  31. Brittle Fracture

  32. Sigma phase/chi Embrittlement

  33. 855 F Degree (475 C Degree) Embrittlement

  34. Softening (Spheroidization)

  35. Reheat Cracking

  36. Sulfiric Acid Corrosion

  37. Hydroflouric Acid Corrosion

  38. Fleu Gas Dew point Corrosion

  39. Dissimalar Metal Weld (DMW) Cracking

  40. Hdrogen stress Cracking in HF

  41. Dealloying(Dezincification/Denickelification)

  42. CO2 Corrosion

  43. Corrosion Fatigue

  44. Feul ash Corrosion

  45. Amine corrosion

  46. Corrosion Under Insulation

  47. Atmospheric Corrosion

  48. Ammonia Stress Corrosion Cracking

  49. Cooling water corrosion

  50. Boiler water/Condensate corrosion

  51. Micro-biologically Induced Corrosion (MIC)

  52. Liquid Metal Embrittlement

  53.  Galvanic Corrosion

  54. Mechanical Fatigue

  55. Nitriding

  56. Vibration-Induced Fatigue

  57. Titanium Hydriding

  58. Soil Corrosion

  59. Metal Dusting

  60. Strain Aging

  61. Sulfate Stress Corrosion (SSC) Cracking  

  62. Phosphoric Acid Corrosion

  63. Phenol (Carbolic Acid) Corrosion

  64. Ethanol Stress Corrosion Cracking

  65. Oxygen-Enhanced Ignition and Combustion

  66. Organic Acid Corrosion of Distlilation Tower Overhead System.

Also, there are some of failure mechanism that is generated by the motion of structures .

  1. Pitting
  2. Abrasive wear
  3. fatigue
  4. misalignment
  5. Unbalance

Also, some failures related to the physicals laws for example sometimes a filter is squashed it may be resulted because the internal body of filter is  has very low pressure than atmospheric pressure. So,the difference in pressure which is resulted in huge pressure applied on External parts of the filter if the pressure applied is greater than strength of material (compression strength) then it will fail.

 

jayachandra dasari
by jayachandra dasari , internship person , RCI - DRDO

1. power supply

2. motor winding short circuited

3. running winding not excited (single phase motor)

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