Functional Safety 2016

Challenge for SIL assessment - Consequence

Consequence

• Extent of overpressure needs modelling (particularly for finite gas cap)

• May be significant reduction in overpressure (hence consequence) due to

PSVs opening (say 98% probability)

• Appropriate ignition probability for very large overpressures / high energy

events

Ref. [4] OGP Ignition probabilities

[5] IP Research Report - Ignition probability review