10d (edited) • Case Studies
Case Study 002 – Proof Testing Coverage Gap
A new case study has been added to the classroom.
Scenario:
A SIL 2 reactor feed isolation valve has been proof tested annually for 10 years.
Every test has passed.
The SIL verification claims 90% proof test coverage.
Your task: Determine why the SIF is failing to meet its SIL 2 target.
Full case study here: [link]
Questions:
- What is the first thing you would check in the proof test procedure?
- How would you justify a revised coverage figure without retesting?
- Would you accept a partial stroke test as a high-coverage test?
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Case Study 002 – Proof Testing Coverage Gap
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