Adjusting Spring Operated Pressure Relief Valve Proof Test Intervals Using Statistical Modeling, and Comparing the Resulting Financial Risk

Global Congress on Process Safety
2010 Global Congress on Process Safety
Global Congress on Process Safety
March 22, 2010 - 8:00pm
A method for adjusting spring operated pressure relief valve (SORV) inspection intervals is presented based on hazard identification, financial risk assessment, fluid service, and comparison of the life-cycle testing costs. Intuitively, longer intervals between maintenance and proof testing should tend to increase the likelihood of the catastrophic event (valve stuck shut on demand). A case study for one production facility is presented where risk quantification is broken into probability of an actual demand on the pressure relief device, probability of the valve being in a stuck shut condition, and consequences of the event. Estimates for the probability of the stuck shut condition were obtained through extensive statistical studies and modeling of Department of Energy's Savannah River Site (SRS) data and use of the Center for Chemical Process Safety (CCPS) Process Equipment Reliability Database (PERD). The probability of failure on demand for mild, moderate, and severe fluid services are derived from existing risk-based inspection technology and experience at SRS. The paper will give a graphical illustration of the lowest lifetime inspection costs versus the associated risks by using Monte Carlo Simulation and a statistical model for lift pressure growth. Analyses of anticipated financial risks are then compared to adjusted life cycle costs.
Professional Development Hours
0.5 PDHs
You will be able to download and print a certificate for these PDH credits once the content has been viewed. If you have already viewed this content, please click here to login.
Presenter(s): 

Would you like to access this content?

No problem. You just have to complete the following steps.

You have completed 0 of 2 steps.

  1. Log in

    You must be logged in to view this content. Log in now.

  2. Purchase Technical Presentation

    You must purchase this technical presentation using one of the options below.
    If you already purchased this content recently, please click here to refresh the system's record of ownerships.

Pricing

Credits 0.5 Use credits
List Price $25.00 Buy now
AIChE Members $15.00 Buy now
AIChE Undergraduate Student Members Free Free access
AIChE Graduate Student Members Free Free access
Skill Level: