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

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RISK-BASED INSPECTION METHODOLOGY, PART 3—CONSEQUENCE OF FAILURE METHODOLOGY 3-127

pvcedi vn ,

VCE

Vapor Release

poi vn ,

Ignition

( 1−

poiivn

, )

Delayed Ignition

poii vn ,

Immediate Ignition

Flame Front Fast

( 1−

pvcedivn

, )

Flame Front Slow

Flash Fire

Jet Fire, if continuous

Fireball, if instantaneous

( 1−

poivn

, )

No Ignition

Safe Dispersion 1

Liquid Release

poi ln ,

Ignition

( 1−

poiiln

, )

Delayed Ignition

poii ln ,

Immediate Ignition

pvcedi ln ,

Flame Front Fast

( 1−

pvcediln

, )

Flame Front Slow

VCE

Flash Fire

Pool Fire

( 1−

poiln

, )

No Ignition

Safe Dispersion 1

pvcedi 2,n

VCE

( 1−

poii2,

n )

Flame Front Fast

poi 2,n

Ignition

Delayed Ignition

( 1−

pvcedi2,

n )

Flame Front Slow

Flash Fire

max(Jet Fire, Pool Fire)

Two-Phase Release

poii 2,n

Immediate Ignition

Continuous

Fireball

( 1−

poi2,

n )

Instantaneous

No Ignition

Safe Dispersion 1

1

If released fluid is toxic, or could result in steam burns or acid splashes, these consequences are considered before a safe dispersion.

Figure 5.3—Level 2 Consequence Analysis Event Tree for Leakage Case

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