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If You Can’t See It You Can’t Detect It

[+] Author Affiliations
Edward J. Farmer

EFA Technologies, Inc., Sacramento, CA

Paper No. IPC2008-64672, pp. 749-755; 7 pages
doi:10.1115/IPC2008-64672
From:
  • 2008 7th International Pipeline Conference
  • 2008 7th International Pipeline Conference, Volume 1
  • Calgary, Alberta, Canada, September 29–October 3, 2008
  • Conference Sponsors: International Petroleum Technology Institute and the Pipeline Division
  • ISBN: 978-0-7918-4857-9 | eISBN: 798-0-7918-3835-8
  • Copyright © 2008 by ASME

abstract

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.

Copyright © 2008 by ASME

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