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Pipeline Leak Detection Systems: Obtaining PD, PFA, and Parameters

Learn the definitions, calculations, and strategies for obtaining crucial parameters like PD (Probability of Detection) and PFA (Probability of False Alarm) in pipeline leak detection systems. Ensure instrument accuracy and non-leaking pipelines to enhance system performance.

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Pipeline Leak Detection Systems: Obtaining PD, PFA, and Parameters

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  1. Obtaining PD ,PFA , and Other Important Parameters For Pipeline Leak Detection System Sam Gordji, samgordji@yahoo.com To obtain a copy of “Standard Test Procedures for Evaluation Leak Detection Methods: Pipeline Leak Detection Systems”, please visit: http://www.epa.gov/swerust1/ustsystm/pipe.pdf Or http://www.nwglde.org/protocols.html

  2. Definitions • Noise: A random variable, fluctuation in measurement due to temperature, pressure, and other factors • Signal, a leak, e.g. .1 gph, .2 gph, etc. • Signal-plus-noise, when the signal is added to the noise • LR, leak rate • Threshold, a location between the zero leak rate and a specific leak rate, usually half way between the above two location

  3. Noise Only Cumulative Frequency Distribution (CFD)

  4. -.1 Is Added to Every Test ResultsThis Is the CFD for a Leak Rate of -.1 gph

  5. When the Noise Is Added to the Signal

  6. Deleting the 2 Lower and One Higher Observations

  7. For the Same Data Changing the LR to -.20 From -.1

  8. Page A-6 of SIR Protocol

  9. With Leaking Tank Out of the Picture We Have

  10. Conclusion • When testing, it is real important to ensure that the instruments are working correctly and we have non-leaking pipelines • As seen from the data, larger variation in the measurements the “random noise” causes problem and decrease the PD and increase the PFA • Please email your question to: samgordji@yahoo.com • Thank you

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