Fundamental to all process monitoring and control is observability, the quality that the state of a system (e.g., a pipeline leaking or not leaking) is actually discernable from the measurements available. Here are four examples of how measurement issues obliterated productive monitoring. In one example a transient phase change in a process loop results in gross mis-measurement at one end. A second example illustrates that buying a flow meter does not always result in flow measurement. A third example shows a pipeline in which the readings at one end show absolutely no relationship to the other. The fourth example shows a pipeline that appears to be leaking at one end but fine at the other. The concept of observability provides some structure for thinking through these situations and developing solutions.
- International Petroleum Technology Institute and the Pipeline Division
If You Can’t See It You Can’t Detect It
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Farmer, EJ. "If You Can’t See It You Can’t Detect It." Proceedings of the 2008 7th International Pipeline Conference. 2008 7th International Pipeline Conference, Volume 1. Calgary, Alberta, Canada. September 29–October 3, 2008. pp. 749-755. ASME. https://doi.org/10.1115/IPC2008-64672
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