CONCLUSION
• Integrity levels (PFD, HFT and SC), and SIFRT are
both critical
factors
• PST & SIFRT throughout lifecycle – set margin early
• The method of measurement & technology impact
device response time
• Supplier guarantee is a challenge
• Validate SIFRT at installation & at periodic testing
• Documentation is important.
Slide 24
Challenges in Achieving Safety Instrumented Function Response Time for a Fast-Acting Process• K. Rampaul, A., A.
Barnwell, S. Sookhoo