April 2003

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HP Automation Safety: Beware of trip point negative creep

I recently rediscovered a curious phenomenon that affects SIS shutdown settings: trip points. This malady is particularly problematic for flow measurements in plants that have gone thro..

Marsza, E. M., exida LLC

I recently rediscovered a curious phenomenon that affects SIS shutdown settings: trip points. This malady is particularly problematic for flow measurements in plants that have gone through several capacity-increasing revamps. The biggest source of concern for the HPI is that no overt symptoms indicate that the condition exists. I have decided to call the condition that I am describing "trip point negative creep" (TPNC). Strangely enough, TPNC occurs when shutdown settings, in engineering units, stay the same during one or more capacity upgrades. When capacity is upgraded, flowrates and, thus, flow transmitter measurement

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