78-79 / 975
Hybrid applications of IEC61511 – Laurie Blackmore
Equipment is categorised by type such as pressure vessels, pumps, heat exchangers etc
For each category the requirement for instrumented trips is pre-defined regardless of
level of risk
Requirements for mechanical protection such as relief valves are also defined
No performance requirements are specified
Software and systematic fault concerns are not explicitly considered
Onerous test intervals are specified. SIS transmitters every 3 months and SDV’s
annually
6
API Design Basis