SIF Design tab

This tab is used to do the SIF Design. The aim is to design the Subsystems in terms of their  Equipment Actuators and Test Intervals , such that the Achieved PFD is equal or higher than the Target PFD , while ensuring that the Success ...

The Subsystems that were added on the General tab can be further defined/designed on the Design Tab in terms of the Equipment Actors. To add or remove Equipment Actors, just click + or - . Click + or - to add or remove Equipment Actor...

Success Criteria for the SIF Analysis is defined in terms of the Equipment- Actors . The table below summarizes the Success Criteria nomenclature. Typical Success Criteria nomenclature used: The of Success Criteria  must be defined o...

Each Equipment- Actor   can have multiple proof Tests . These are defined on the Equipment level. The aim is to set an interval for each of these Tests, which ensures an Achieved PFD < Target PFD  (see Calculating SIF Achieved PFD...

You need to verify that the Achieved PFD is less than the Target PFD .  (The Target PFD is normally calculated during the LOPA Assessment , but if not connected to a LOPA it could also be a static value that you enter on the SIF Analysi...

The DFT ( Dangerous Fault Tolerance ) requirements for the SIF Analysis are checked on the Subsystem level. The SIF design (Equipment selected in the Subsystem and Equipment Success Criteria ) is checked against the DFT requirements that are se...

The Performance for the SIF Analysis  is verified per Subsystem . Performance is verified per Subsystem. The Performance check considers two criteria: Sensor Accuracy (on the Sensor ) Tight Shut-Off ( TSO ) for valves (on the...

For the SIF Analysis the Overall Functional Response Time  is calculated as the longest response times of the Sensor Subsystems plus the longest of the Logic Solver Subsystems and the longest response time of the Final Element Subsystems ...

When all is verified ( Achieved PFD checked, Performance checked, and Response Time checked) then you can Approve your design in the Approval area. Approval Prerequisites The following Approval rules apply: Unrated SIFs Approval is a...

Each SIS Analysis has an AS (Assessment Status) associated with it. This is shown on the SIF Analysis Main Screen , as well as on the General Tab . The Assessment Status indicator turns green (OK) when: A Target SIL ( Target PFD ) is availa...

Each SIF Analysis has a DS (Design Status) associated with it. This is shown on the Analysis Main Screen , as well as on the Details Page General Tab and Design Tab . DS Indicator for Unrated (-) SIFs Not Applicable - When the Assessme...