Hazop Study

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HAZOP ?

BY: IHSAN ALI WASSAN 14CHEMICAL ENGINEERING

Quaid-e-Awam University of Engineering Science & Technology, Nawabshah, Sindh Pakistan

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HAZOP ?-Definition?-Background?

Where HAZOP is used ? Seven Steps of HAZOP study?

Contents ?

3A SCENARIO….

You and your family are on a road trip by using a car in the middle of the night. You were replying a text message while driving at 100 km/h and it was raining heavily. The car hits a deep hole and one of your tire blows. You hit the brake, but due to slippery road and your car tire thread was thin, the car skidded and was thrown off the road.

4POINTS TO PONDER

What is the cause of the accident?

What is the consequence of the event?

What can we do to prevent all those things to happen in the first place?

What other possible accidents might happen on the road trip?

Can we be prepared before the accident occurs?

5Can we make it more systematic?Parameter Guideword Possible

CausesConsequences Action Safeguard

Car speed Too fastToo slow

Rushing Skidded when emergency brake

- Slow down- Speed up

-ABS brake system-Safety belt- Air bag

Tire No threadLess thread

Tire too old, often speeding and emergency break

Car skidded - Check frequently- Have spare tire

Window visibility

LowVery low

Rain Cannot see the road

Car light DimNo light

-Stop car-Go to nearest garage-Use emergency signal

Road With holesRocky

Breaks the car tire - Put a signboard-Street lights

Travel time NightFoggy

No street light -Travel during daylight

6HAZOP ?

A Hazard and Operability (HAZOP) study 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.

A HAZOP is a qualitative technique based on guide-words and is carried out by a HAZOP team during a set of meetings.

A HAZOP is a process to identify and Access risks.

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The HAZOP technique was initially developed to analyze chemical process systems, but has later been extended to other types of system.

BACKGROUND ?

8HAZOP ?

9RISK ?

10HAZOP ?

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• HAZOP technique is used by most major companies handling and processing hazardous material,- oil and gas production- flammable and toxic chemicals- pharmaceuticals etc

Where HAZOP is used ?

127 steps of HAZOP ?

Let’s break down a HAZOP into 7 steps:1. Identify the Risk by asking what can cause a hazardous event.2. Describe the consequence and assign a severity level.3. Assess the probability of the cause.4. Evaluate the Risk based on the severity and probability without any

safeguards5. Look up your Risk Matrix to categorize the Risk.6. Assess the Risk with Safeguards7. Make a decision to accept the Risk or make a recommendation to further

reduce the risk.
















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