1 / 10

Obtaining P D ,P FA , and Other Important Parameters For Pipeline Leak Detection System

Obtaining P D ,P FA , 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:

minya
Télécharger la présentation

Obtaining P D ,P FA , and Other Important Parameters For Pipeline Leak Detection System

An Image/Link below is provided (as is) to download presentation Download Policy: Content on the Website is provided to you AS IS for your information and personal use and may not be sold / licensed / shared on other websites without getting consent from its author. Content is provided to you AS IS for your information and personal use only. Download presentation by click this link. While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server. During download, if you can't get a presentation, the file might be deleted by the publisher.

E N D

Presentation Transcript


  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 locations • The calculation of the PFA , the PD, and other parameters of special importance since they appear in all the protocols

  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 two 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 really 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

More Related