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What is a HAZOP?

A hazard and operability study (HAZOP) is a structured and systematic examination of a planned or existing process or operation in order to identify and evaluate problems that may represent risks to personnel or equipment, or prevent efficient operation.

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What is a HAZOP?

  1. 1. What is a HAZOP?
  2. 2. HAZOP stands for hazardand operability study
  3. 3. HAZOP is a process toidentify and assess risk
  4. 4. But before we can assessrisk…we need understandwhat is risk?
  5. 5. There are twocomponents of risk
  6. 6. First component is theprobability of a futureevent…
  7. 7. … and second is theconsequence of the event
  8. 8. HAZOP identifies riskthrough a creative andcollaborative process…
  9. 9. … based on thecollective knowledge ofa multi-disciplinaryteam
  10. 10. With a facilitator to guidethe team to achieve highquality decisions
  11. 11. Lets break down a HAZOPinto seven steps…
  12. 12. Step 1: Identify the risk byasking what can cause ahazardous event…
  13. 13. … by thinking of specificprocess deviations
  14. 14. Here are some examplesof process deviation…• High Temperature• High Pressure• No Level• Misdirected Flow
  15. 15. Lets look at an example
  16. 16. What can cause a highpressure in thefollowing process?
  17. 17. D-101 Re-boiler Condensate Pot PSV Size ½ 111 SET @ 700kPag To atmosphere at safe locationSteam Drawing Ref. D-101 LT 3/4” 2” 253 3” HLL=2550 mm PG 253 NLL=1650 mm LLL=250 mm LC 2” 3” 253 3/4” 6” LY LV 253 253 Condensate 6” 6” 6” Drawing Ref. 6”
  18. 18. What if the levelcontrol valve fails inthe closed position?
  19. 19. D-101 Re-boiler Condensate Pot PSV Size ½ 111 SET @ 700kPag To atmosphere at safe locationSteam Drawing Ref. D-101 LT 3/4” 2” 253 3” HLL=2550 mm PG 253 NLL=1650 mm LLL=250 mm LC 2” 3” 253 3/4” 6” LY LV 253 253 Condensate 6” 6” 6” Drawing Ref. 6”
  20. 20. Step 2: Describe theconsequences and assigna severity level
  21. 21. What if the re-boilercondensate potoverpressure leading torupture?
  22. 22. D-101 Re-boiler Condensate Pot PSV Size ½ 111 SET @ 700kPag To atmosphere at safe locationSteam Drawing Ref. D-101 LT 3/4” 2” 253 3” HLL=2550 mm PG 253 NLL=1650 mm LLL=250 mm LC 2” 3” 253 3/4” 6” LY LV 253 253 Condensate 6” 6” 6” Drawing Ref. 6”
  23. 23. The consequence ofvessel rupture can be afatality
  24. 24. Step 3: Assess theprobability of the cause
  25. 25. D-101 Re-boiler Condensate Pot PSV Size ½ 111 SET @ 700kPag To atmosphere at safe locationSteam Drawing Ref. D-101 LT 3/4” 2” 253 3” HLL=2550 mm PG 253 NLL=1650 mm LLL=250 mm LC 2” 3” 253 3/4” 6” LY LV 253 253 Condensate 6” 6” 6” Drawing Ref. 6”
  26. 26. What is the probabilityof the level controlloop failure?
  27. 27. Step 4: Evaluate the riskbased on the severity andprobability without anysafeguards
  28. 28. Lets say our scenariohave a high probabilityof a control loopfailure and a highseverity due to largeproduction loss
  29. 29. Look up your risk matrixto categorize the risk…
  30. 30. Probability… by locatingthe risk basedon theprobability andthe severity Severity
  31. 31. Step 6: Assess the riskwith safeguards
  32. 32. D-101 Re-boiler Condensate Pot PSV Size ½ 111 SET @ 700kPag To atmosphere at safe locationSteam Drawing Ref. D-101 LT 3/4” 2” 253 3” HLL=2550 mm PG 253 NLL=1650 mm LLL=250 mm LC 2” 3” 253 3/4” 6” LY LV 253 253 Condensate 6” 6” 6” Drawing Ref. 6”
  33. 33. In our case the pressuresafety valve will reducethe likelihood of a tankrupture
  34. 34. Step 7: Make a decision toaccept the risk or make arecommendation tofurther reduce the risk
  35. 35. ProbabilityYour riskmatrix definesthe riskacceptance Consequencecriteria
  36. 36. Make a recommendationwhen the risk in notacceptable
  37. 37. RememberThere is no value in arecommendation withoutcommitment to action…
  38. 38. HAZOP alone does notchange your risksexposure unless thereare effective actionssustainable foroperation
  39. 39. Any Questions?
  40. 40. Risk. Inspired.For more lessons go towww.icarus-orm.com

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