July 2008

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HP Automation Safety: Accounting for process connections in SIS design

 Many safety instrumented system (SIS) designers understand what happens when the process connection to a pressure transmitter gets plugged. The transmitter output will likely get very sluggish a..

Goble, W., exida LLC

  Many safety instrumented system (SIS) designers understand what happens when the process connection to a pressure transmitter gets plugged. The transmitter output will likely get very sluggish and may even trap a fixed pressure at the sensor. The safety instrumented function that depends on that transmitter will fail dangerously. Those who do safety integrity level (SIL) verification calculations know that when the estimated failure rates due to plugged impulse lines are included in the probabilistic analysis, it can be hard to even meet SIL 2. More process connection problems. There are similar problems for differential pressure primary elements. In some applications, such as coker

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