RECOMMENDATIONS
Slide 21
Challenges in Achieving Safety Instrumented Function Response Time for a Fast-Acting Process• K. Rampaul, A., A.
Barnwell, S. Sookhoo
- identification of all cases
resulting in the hazard
1. Risk and Hazard
Assessment
- potential fast acting cases
2. Functional
Requirements
- PST determination
- design margin between PST and SIFRT
- document in SRS
3. Design & Verification
- Device response time
- Selection of measurement method,
technology selection, installation method
- response time guarantee
4. Installation &
Validation
- validation of SIFRT
5. Maintain & Improve
- periodic testing of SIFRT
- modifications comply with target
SIFRT – set-point change, device
upgrade etc.