Bowtie ; Palm Oil Mill Boiler example

Here’s a practical Bowtie example specifically for a palm oil mill, commonly applied in Process Safety Management.

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🌴 Bowtie Example: Boiler Explosion in Palm Oil Mill

🔷 Visual Example

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🔶 1. Top Event (Center)

🔥 Boiler Overpressure / Explosion

This is one of the highest risks in a palm oil mill due to steam generation for processing.

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🔶 2. Threats (Left Side – Causes)

Typical causes in a mill environment:

• Low water level in boiler drum

• Failure of feedwater pump

• Blocked steam outlet

• Safety valve malfunction

• Operator error / poor monitoring

• Scale buildup (poor water treatment)

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🔶 3. Preventive Barriers (Left Controls)

Controls to prevent the top event:

• Automatic low-water cut-off system

• Routine boiler inspection & maintenance

• Water treatment program

• Pressure relief valve testing

• Operator competency training

• Alarm & interlock system

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🔶 4. Consequences (Right Side)

If explosion occurs:

• Fatalities / severe injury

• Major plant damage

• Production shutdown

• Fire outbreak

• Environmental impact

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🔶 5. Mitigation Barriers (Right Controls)

Controls to reduce impact:

• Emergency shutdown system (ESD)

• Explosion relief panels

• Fire protection system (hydrant/sprinkler)

• Emergency response plan

• PPE & evacuation drills

• Insurance / business continuity plan

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🔷 Simple Bowtie Layout (Palm Oil Mill Context)

Threats                    Prevention            TOP EVENT             Mitigation                Consequences
--------                   ----------            ---------             ----------                ------------
Low water level      →   Level control     →   Boiler Explosion   →   ESD system          →   Fatality
Pump failure         →   Pump maintenance  →                      →   Fire system         →   Plant damage
Scale formation      →   Water treatment   →                      →   Evacuation plan     →   Shutdown
Human error          →   Training/SOP      →                      →   PPE                 →   Injury

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🔷 Another Common Palm Oil Mill Bowtie (Quick Idea)

🛢️ Digester / Press Fire

• Top Event: Oil ignition

• Threats: Overheating, friction, poor housekeeping

• Prevention: Temperature control, cleaning, lubrication

• Mitigation: Fire suppression, extinguishers

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🔥 Practical Insight (From Industry)

In many palm oil mills, the biggest gap is not equipment — but discipline:

• SOP not followed

• Alarm ignored

• Maintenance delayed

That’s where bowtie helps — it makes everyone SEE their role in safety barriers.