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API RP 581 - 3rd Ed.2016 - Add.2-2020 - Risk-Based Inspection Methodology

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3-72 API RECOMMENDED PRACTICE 581

Instantaneous-Type Release

VCE

Late Ignition

Flash Fire

Early Ignition

Fireball

Final State Gas

No Ignition

Above AIT

Fireball

Safe Dispersion

Ignition

Pool Fire

Final State Liquid

No Ignition

Safe Dispersion

Continuous-Type Release

VCE

Late Ignition

Flash Fire

Early Ignition

Jet Fire

Final State Gas

No Ignition

Above AIT

Jet Fire

Safe Dispersion

Final State Liquid

Ignition

No Ignition

Pool Fire

Jet Fire

Safe Dispersion

Figure 4.2—Level 1 COF Release Event Tree

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