Functional Safety 2016

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.