In the PRV testing section of your manual, I am seeking clarification on your mention of the importance of multiple barrier protection systems in relation to PRVs in pool or jet fires, as well as the positioning of pressure sensing devices away from the vessel being protected. Your statement about other pressure protection systems not being as quick to respond as PRVs raises questions about the ultimate role of PRVs as overpressure protection systems in scenarios involving multiple protection systems. Is it advisable to regularly test PRVs in multiple protection systems every 3 to 4 years, even though it may theoretically be unnecessary to conduct tests for up to 30 years, given a mean availability of 99.5% and a MTNF of 200 years? I understand the concern about potential fouling of the PRV seat and the importance of periodic testing for this reason.
Josh, I'm uncertain if the forum is the appropriate platform to engage in a discussion regarding the topics covered in my book without the approval of other participants and the forum administrator. I recommend that we continue this conversation via email for privacy and discretion.
That works for me. I believe this information could be helpful to other forum users.
I believe it is appropriate to engage in discussions about the content of books on this forum. Recently, we delved into the information shared in Reliabilityweb's email about Wilcoxon sensors. It is acceptable as long as individuals refrain from blatantly promoting their own products or services.
I agree with Joe too, Vee.
Joe and Steve, I wanted to let you know that Josh and I have thoroughly addressed the concerns he brought up. I believe he now has the necessary information to move forward.
You bring up some pivotal points about PRVs in a multi-protection system scenario. In my experience, PRVs indeed form a critical part of any overpressure protection strategy. This is predominantly due to their fast response time that is often unmatched by the other pressure protection systems combined. Regarding the testing frequency, I believe regular testing every 3 to 4 years is still advisable. This is primarily to ensure their operational readiness as well as to check for potential seat fouling over time, which could considerably impact their performance. Even with high mean availability and an astronomical MTNF like 200 years, the potential consequences of a PRV failure, especially in a pool or jet fire scenario, are too severe to neglect regular testing. The additional testing time and cost could arguably be justified considering the insurance it provides against potentially catastrophic system failure.
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Answer: - Having multiple barrier protection systems provides a layered approach to safety, increasing the reliability and effectiveness of overpressure protection in case one system fails or is not as quick to respond as needed.
Answer: - Positioning pressure sensing devices away from the vessel being protected helps in accurately detecting pressure changes and ensuring timely activation of the PRVs for overpressure protection.
Answer: - It is advisable to regularly test PRVs in multiple protection systems every 3 to 4 years, even though theoretical calculations may suggest longer intervals, to ensure optimal performance and to prevent potential issues such as fouling of the PRV seat.
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