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. Visit www.icarus-orm.com to learn more.

1. What is a HAZOP?

2. HAZOP stands for hazard
and operability study

3. HAZOP is a process to
identify and assess risk

4. But before we can assess
risk…
we need understand
what is risk?

5. There are two
components of risk

6. First component is the
probability of a future
event…

7. … and second is the
consequence of the event

8. HAZOP identifies risk
through a creative and
collaborative process…

9. … based on the
collective knowledge of
a multi-disciplinary
team

10. With a facilitator to guide
the team to achieve high
quality decisions

11. Lets break down a HAZOP
into seven steps…

12. Step 1: Identify the risk by
asking what can cause a
hazardous event…

13. … by thinking of specific
process deviations

14. Here are some examples
of process deviation…
• High Temperature
• High Pressure
• No Level
• Misdirected Flow

15. Lets look at an example

16. What can cause a high
pressure in the
following process?

17. D-101 Re-boiler Condensate Pot
PSV Size ½
111 SET @ 700kPag
To atmosphere at safe
location
Steam
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. What if the level
control valve fails in
the closed position?

19. D-101 Re-boiler Condensate Pot
PSV Size ½
111 SET @ 700kPag
To atmosphere at safe
location
Steam
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. Step 2: Describe the
consequences and assign
a severity level

21. What if the re-boiler
condensate pot
overpressure leading to
rupture?

22. D-101 Re-boiler Condensate Pot
PSV Size ½
111 SET @ 700kPag
To atmosphere at safe
location
Steam
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”

24. The consequence of
vessel rupture can be a
fatality

25. Step 3: Assess the
probability of the cause

26. D-101 Re-boiler Condensate Pot
PSV Size ½
111 SET @ 700kPag
To atmosphere at safe
location
Steam
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”

27. What is the probability
of the level control
loop failure?

29. Step 4: Evaluate the risk
based on the severity and
probability without any
safeguards

30. Lets say our scenario
have a high probability
of a control loop
failure and a high
severity due to large
production loss

31. Look up your risk matrix
to categorize the risk…

32. Probability
… by locating
the risk based
on the
probability and
the severity Severity

33. Step 6: Assess the risk
with safeguards

35. D-101 Re-boiler Condensate Pot
PSV Size ½
111 SET @ 700kPag
To atmosphere at safe
location
Steam
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”

36. In our case the pressure
safety valve will reduce
the likelihood of a tank
rupture

37. Step 7: Make a decision to
accept the risk or make a
recommendation to
further reduce the risk

38. Probability
Your risk
matrix defines
the risk
acceptance Consequence
criteria

39. Make a recommendation
when the risk in not
acceptable

40. Remember
There is no value in a
recommendation without
commitment to action…

41. HAZOP alone does not
change your risks
exposure unless there
are effective actions
sustainable for
operation

42. Any Questions?

43. Risk. Inspired.
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