Academy Discounts

Get a 10% discount on all eLearning courses until November 29, 2020. Use code ELEARN10 at checkout.

Using Root Cause Failure Analysis Results to Estimate Failure Rates and PFDavg for Spring Operated Pressure Relief Valves

  • Type:
    Conference Presentation
  • Conference Type:
    AIChE Spring Meeting and Global Congress on Process Safety
  • Presentation Date:
    March 22, 2010
  • Duration:
    30 minutes
  • Skill Level:
  • PDHs:

Share This Post:

In a companion paper, root cause of failure analysis (RCA) was used to estimate the times to failure of a set of spring operated pressure relief valves (SORV) that were found in the fail-to-open (FTO) condition upon proof test. We now use these estimated times to failure to estimate the failure rate, ?D(t), of the SORV population with respect to the FTO mode of failure. The average probability of failure on demand (PFDavg) is then computed using the estimate for ?D(t). Additionally, we compute PFDavg directly from the proof test data and estimated times to failure and explain why this new approach provides a more accurate characterization of process-wide safety than does PFDavg computed from ?D(t) and probability of initial failure (PIF). We also demonstrate that the changes instituted as a result of the RCA study at the data-source facility have lead to measurable improvements in plant safety.

Once the content has been viewed and you have attested to it, you will be able to download and print a certificate for PDH credits. If you have already viewed this content, please click here to login.



Do you already own this?



AIChE Member Credits 0.5
AIChE Members $15.00
AIChE Graduate Student Members Free
AIChE Undergraduate Student Members Free
Non-Members $25.00