(126c) Systematic Errors That Compromise Integrity of Safety Instrumented Systems
AIChE Spring Meeting and Global Congress on Process Safety
2023
2023 Spring Meeting and 19th Global Congress on Process Safety
Global Congress on Process Safety
Engineered Safety Systems and Mitigation Technologies II
Wednesday, March 15, 2023 - 11:15am to 11:45am
Safety Instrumented Systems (SIS) are an important Independent Protection Layer (IPL) to mitigate risk. Where many safeguards, such as a Basic Process Control System (BPCS), are credited with one order of magnitude risk reduction (RRF 10), a SIS is capable of mitigating one, two or three orders of magnitude (RRF 10, 100 or 1000). Proper specification, design and maintenance of a SIS are critical to ensure that the SIS delivers the assigned risk reduction. Issues with SIS lifecycle management can lead to systematic errors such as underestimating the Safety Integrity Level (SIL) target, overestimating the risk reduction provided by design, and inadequate maintenance, testing or replacement. This paper will discuss some of these systematic errors and provide tips to avoid them.
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