HAZOP study (part II)
Short Description
HAZOP...
Description
HAZOP STUDY REPORT
HAZOP STUDY 6|Page
UNIVERSITY OF KARACHI
HAZOP STUDY REPORT
7|Page
UNIVERSITY OF KARACHI
HAZOP STUDY REPORT
8|Page
UNIVERSITY OF KARACHI
HAZOP STUDY REPORT
Equipment reference and operating condition Pump PU-01
Deviation from operating condition
What event can cause this deviation
Consequences of this deviation on item of equipment under consideration
Additional implication of this sequences
Action Required (recommendation)
Flow Less 1. NH3 storage empty 2. LCV-01 fails closed 3. NRV-01 fails closed 4. Line 100 plugs
Pump cavitates
Damage to pump
Deadhead pump
Damage to pump
Deadhead pump
Damage to pump
Use level alarm in NH3 Storage Use by pass manual valve system at LCV-01 Use Flow Indicator
Pump cavitates
Damage to pump
Use flow Indicator
5. Line 101 plugs
Deadhead pump
Damage to pump
6. LIC-1 fails, closing LCV-01
Deadhead pump
Damage to pump
Use by pass manual valve system
7. LCV-01 fails open
Upset in vaporizer
Liquid level increases Pressure increases
8. LIC-1 fails, opening LCV-01
Upset in vaporizer
Liquid level increases Pressure increases
More
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Use by pass manual valve system Use drain valve before pump Use by pass manual valve system
UNIVERSITY OF KARACHI
HAZOP STUDY REPORT
Pressure More
Less
Use by pass manual valve system Use pressure Indicator
9. LCV-01 fails closed 10. NRV-01 fails closed 11. LIC-1 fails, closing LCV-01 12. Line 101 plugs
Deadhead pump
Damage to pump
Deadhead pump
Damage to pump
Deadhead pump
Damage to pump
Deadhead pump
Damage to pump
13. LCV-01 fails open
Liquid level increases Liquid level increases
Upset in vaporizer Use by pass manual valve system Upset in vaporizer Use by pass manual valve system
15. NH3 storage empty 16. Line 100 plugs
Pump cavitates
Damage to pump
Pump cavitates
Damage to pump
17. LCV-01 fails closed 18. NRV-01 fails closed 19. LIC-1 fails, closing LCV-01 20. Line 101 plugs
Deadhead pump
Deadhead pump
Deadhead pump
Deadhead pump
14. LIC-1 fails, opening LCV-01
Use by pass manual valve system Use pressure Indicator
Use level alarm in NH3 Storage
Temperature More
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Damage to pump Use temperature Indicator Damage to pump Use temperature Indicator Damage to pump Use temperature Indicator Damage to pump
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HAZOP STUDY REPORT
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UNIVERSITY OF KARACHI
HAZOP STUDY REPORT
Equipment reference and operating condition Vaporizer VE-01
Deviation from operating condition Level Less
What event can cause this deviation
Additional implication of this sequences
Action Required (recommendation)
21. Line 101 plugs
Heat/steam loss
Excessive vaporization
22. Rupture line 101
Heat/steam loss
23. PCV-01 fails open
Heat loss/steam loss Excessive vaporization
Excessive vaporization Use by pass manual Side reaction will valve system occur in the reactor Ammonia loss
24. PIC-1 fails opening PCV-01
Heat loss/steam loss Excessive vaporization Heat/steam loss
25. LCV-01 fails closed 26. NRV-01 fails closed 27. LIC-1 fails, closing LCV-01
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Consequences of this deviation on item of equipment under consideration
Heat/steam loss Heat/steam loss
28. FCV-01 fails open
Heat loss/steam loss
29. FFC-1 fails, opening FCV-01
Heat loss/steam loss
Use cascade loop with PIC for level controlling
Use by pass manual Side reaction will valve system occur in the reactor Ammonia loss Excessive vaporization Excessive vaporization Excessive vaporization Use by pass manual Side reaction will valve system occur in the reactor Ammonia loss Use by pass manual Side reaction will valve system occur in the reactor UNIVERSITY OF KARACHI
HAZOP STUDY REPORT
Ammonia loss
More
30. PCV-01 fails close
Insufficient vaporization
31. PIC-1 fails, closing
Insufficient vaporization
32. FCV-01 fails close
Vaporizer Overflow
Reaction seize
33. FFC-1 fails, closing FCV-01 34. LCV-01 fails open
Vaporizer Overflow
Reaction seize
Vaporizer Overflow
35. LIC-1 fails, opening LCV-01
Vaporizer Overflow
Insufficient vaporization Insufficient vaporization
Incomplete reaction in the reactor Incomplete reaction in the reactor Use by pass manual valve system Use by pass manual valve system
No Same as less Pressure More
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36. LCV-01 fails open 37. LIC-1 fails, opening LCV-01 38. FCV-01 fails close
Tank rupture Tank rupture
39. FFC-1 fails, closing FCV-01 40. PCV-01 fails open 41. PIC-1 fails, opening
Tank rupture
Tank rupture
Tank rupture Tank rupture
Use safety valve in VE01 Use safety valve in VE01 Use pressure Indicator
UNIVERSITY OF KARACHI
HAZOP STUDY REPORT
Less
42. Rupture discharge line
NH3 loss
43. Rupture line 101
NH3 loss
44. Tank rupture
NH3 loss
45. FCV-01 fails open
More heat is required in VE-01
NH3 Displaces Alarming system oxygen from should be installed ground up Insufficient NH3 in the reactor Insufficient NH3 in Alarming system should be installed the reactor Insufficient NH3 in the reactor Side reaction will occur in the reactor
46. FFC-1 fails, opening FCV-01
More heat is required in VE-01
Side reaction will occur in the reactor
47. PCV-01 fails close
Vaporization seize
48. PIC-1 fails, closing
Vaporization seize
49. LCV-01 fails closed
Vaporization seize
50. LIC-1 fails, closing LCV-01
Vaporization seize
Incomplete reaction in the reactor Incomplete reaction in the reactor Incomplete reaction in the reactor Incomplete reaction in the reactor Incomplete reaction in the reactor
51. NRV-01 fails closed
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Vaporization seize
UNIVERSITY OF KARACHI
HAZOP STUDY REPORT
Temperature 52. LCV-01 fails close More
Less
Excessive vaporization
Side reaction will occur in the reactor
Use temperature Indicator
53. LIC-1 fails, closing LCV-01
Excessive vaporization
Side reaction will occur in the reactor
Use temperature Indicator
54. NRV-01 fails closed
Excessive vaporization
Side reaction will occur in the reactor
55. FCV-01 fails close
Excessive vaporization
Reaction seize in the reactor
56. FFC-1 fails, closing FCV-01
Excessive vaporization
Reaction seize in the reactor
57. PCV-01 fails open
Excessive vaporization
Side reaction will occur in the reactor
58. PIC-1 fails, opening
Excessive vaporization
Side reaction will occur in the reactor
59. PCV-01 fails close
No vaporization occurs in VE-01 No vaporization occurs in VE-01
Reaction seize
61. LCV-01 fails open
less vaporization occurs in VE-01
62. LIC-1 fails, opening LCV-01
less vaporization occurs in VE-01
Incomplete reaction in the reactor Incomplete reaction in the reactor
60. PIC-1 fails, closing
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Reaction seize
Use temperature Indicator Use temperature Indicator
UNIVERSITY OF KARACHI
HAZOP STUDY REPORT
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UNIVERSITY OF KARACHI
HAZOP STUDY REPORT
Equipment reference and operating condition Compressor C-01
Deviation from operating condition Flow High
Less
What event can cause this deviation
Consequences of this deviation on item of equipment under consideration
63. Piece of filter material (i.e. cloth) breaks free
Damage to compressor
64. Filter saturated
Damage to compressor
65. Line 103 chock
Damage to compressor
Composition As well as 66. Line 103 rupture
Load increases on the compressor
67. Filter saturated Load increases on the compressor 68. Atmosphere humidity increases
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Load increases on the compressor
Additional implication of this sequences
Action Required (recommendation)
Another filter should be installed as standby Insufficient air for reaction in the reactor Insufficient air for reaction in the reactor Damage to compressor Side reaction may occur in the reactor Damage to compressor Side reaction may occur in the reactor Damage to compressor Potential to corrodes
Another filter should be installed as standby
Moisture collector should be installed
UNIVERSITY OF KARACHI
HAZOP STUDY REPORT
Pressure More
69. Piece of filter material (i.e. cloth) breaks free
Damage to compressor
70. Line 106 chock
Surge the compressor
Damage to compressor Insufficient air for reaction in the reactor
Blow off valve should be installed
Performance decreases
Reaction condition will not meet
Use temperature indicator
Temperature More 71. Ambient temperature increases
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HAZOP STUDY REPORT
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UNIVERSITY OF KARACHI
HAZOP STUDY REPORT
Equipment reference and operating condition Reactor RE-01
Deviation from operating condition
What event can cause this deviation
Additional implication of this sequences
Action Required (recommendation)
Composition Other than
72. Wrong reagent
Another possible reaction No reaction
Side reaction will Use analyzer indicator occur in the reactor
As well as
73. Impurities in reagent
Another possible reaction
Side reaction will occur in the reactor
74. FCV-01 fails open
Stress on catalyst bed Stress on catalyst bed
Tank rupture
Pressure More
75. FFC-1 fails, opening FCV-01 Less
76. Rupture line 106
NH3 and O2 loss
77. Rupture line 107
NO and NO2 loss
78. FCV-01 fails close
NH3 and O2 will not enter in the reactor NH3 and O2 will not enter in the reactor
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Consequences of this deviation on item of equipment under consideration
Installed rupture disk at reactor (RE-01)
Tank rupture
Insufficient ratio of NH3 and O2 in the reactor Damage the catalyst bed Reaction seize
Use pressure indicator with alarming system
Reaction seize
UNIVERSITY OF KARACHI
HAZOP STUDY REPORT
Temperature More
Less
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80. PCV-01 fails open
Thermal Stress on catalyst bed
Side reaction will occur in the reactor
81. PIC-1 fails, opening
Thermal Stress on catalyst bed
Side reaction will occur in the reactor
82. FCV-01 fails open
Thermal Stress on catalyst bed
Side reaction will occur in the reactor
83. FFC-1 fails, opening FCV-01
Thermal Stress on catalyst bed
Side reaction will occur in the reactor
84. Rupture line 106
NH3 and O2 loss
Incomplete reaction in the reactor Side reaction will occur in the reactor
85. FCV-01 fails close
Desired Reaction seize
Side reaction will occur in the reactor
86. FFC-1 fails, closing FCV-01
Desired Reaction seize
Side reaction will occur in the reactor
There must be inter cooling system in the reactor
UNIVERSITY OF KARACHI
HAZOP STUDY REPORT
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HAZOP STUDY REPORT
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UNIVERSITY OF KARACHI
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