The safety integrity level (SIL) of equipment used in safety instrumented functions is determined by the average probability of failure on demand (PFDavg) computed at the time of periodic inspection and maintenance, i.e., the time of proof testing. The computation of PFDavg is generally based solely on predictions or estimates of the assumed constant failure rate of the equipment. However, PFDavg is also affected by maintenance actions (or lack thereof) taken by the end user. This paper shows how maintenance actions can affect the PFDavg of spring operated pressure relief valves (SOPRV) and how these maintenance actions may be accounted for in the computation of the PFDavg metric. The method provides a means for quantifying the effects of changes in maintenance practices and shows how these changes impact plant safety.
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ASME 2014 Pressure Vessels and Piping Conference
July 20–24, 2014
Anaheim, California, USA
Conference Sponsors:
- Pressure Vessels and Piping Division
ISBN:
978-0-7918-4604-9
PROCEEDINGS PAPER
The Effects of Maintenance Actions on the PFDavg of Spring Operated Pressure Relief Valves
Julia V. Bukowski,
Julia V. Bukowski
Villanova University, Villanova, PA
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William M. Goble,
William M. Goble
exida, LLC, Sellersville, PA
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Robert E. Gross,
Robert E. Gross
Savannah River Nuclear Solutions, Aiken, SC
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Stephen P. Harris
Stephen P. Harris
Savannah River National Laboratory, Aiken, SC
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Julia V. Bukowski
Villanova University, Villanova, PA
William M. Goble
exida, LLC, Sellersville, PA
Robert E. Gross
Savannah River Nuclear Solutions, Aiken, SC
Stephen P. Harris
Savannah River National Laboratory, Aiken, SC
Paper No:
PVP2014-29118, V06BT06A049; 9 pages
Published Online:
November 18, 2014
Citation
Bukowski, JV, Goble, WM, Gross, RE, & Harris, SP. "The Effects of Maintenance Actions on the PFDavg of Spring Operated Pressure Relief Valves." Proceedings of the ASME 2014 Pressure Vessels and Piping Conference. Volume 6B: Materials and Fabrication. Anaheim, California, USA. July 20–24, 2014. V06BT06A049. ASME. https://doi.org/10.1115/PVP2014-29118
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