| dc.description.abstract | SIL has become the new standard by which industry, manufacturers, and end users will be held to by regulators as good engineering practice. Specifically supporting turbomachinery, the API670 Machinery Protective Systems (5th edition, 2014) [R1] standard has embraced such methodology. To begin the presentation, background on risk assessment, SIL assignment, and API 670 will be reviewed. After it, common SIL assignments for various types of rotating equipment will be presented. The paper will then take a deeper look into what is important regarding the SIL verification calculations based on common interlocks. Such calculations are required to quantify that the probability of failure-average (PFDavg) of the system design meets the SIL assigned earlier in the risk assessment. Since not all of the key factors that affect SIL calculations are intuitively obvious, the authors will break down the SIL calculation models and discuss each parameter in detail. After this model foundation is set, the combined effect of an interlocks design including components (i.e. data), architecture, and maintenance practices will be shown. Lastly, various examples utilizing a cross-section of equipment configurations will help reinforce such SIL calculation principles | en |
