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The SIL 2 Safety Instrumented Function
§
Hazard study identified a scenario where overfill of storage tanker would lead to a
Vapour Cloud Explosion
§
A Buncefield type event
§
Layer of Protection Analysis (LOPA) identified SIL 2 overfill protection required
©ABBGroup
October23,2016|Slide7
SIL 2 Certified Level Sensor
§
Design contractor installed a
single SIL 2 Certified Radar
Level sensor to detect the high
high level and close an in-line
shut off valve
§
Level sensor certified as SIL 2,
HFT 0, Type B
§
Implies a single sensor can
be used for SIL 2
requirement
©ABBGroup
October23,2016|Slide8
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