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©ABBGroup
October23,2016|Slide5
Risk Reduction and Functional Safety Standards
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Current best practice for instrumented safety in the process sector is
IEC61511, BS EN 61511 in the UK
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This is a Functional Safety Standard
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It is a risk based approach
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It uses a Safety Lifecycle to organise the activities
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It introduces Safety Integrity Levels (SIL) as a measure of the amount of
risk reduction
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SIL 1 is lowest level of risk reduction, SIL 4 the highest
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61511 has technical and managerial requirements
The SIL 2 Safety Instrumented Function
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Company owns and operates a number of petroleum storage terminals
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Top Tier COMAH site
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Offload into storage tanks from ship
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Loaded into road tankers
©ABBGroup
October23,2016|Slide6