Abstract
AbstractA safety instrumented system (SIS) is an important independent protection layer (IPL) to mitigate risk. Many IPLs, such as a basic process control system (BPCS), can provide only one order of magnitude risk reduction (RRF 10). A SIS however, is capable of providing one, two, or three orders of magnitude risk reduction (RRF 10, 100, or 1000). Correct specification, design, and maintenance of a SIS is 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 discusses a few of these systematic errors and provide guidelines to avoid them.
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