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Montemayor, thanks for responding. I'll reply to each of your queries in turn: 1. We have a number of cylinders actually, but the one I first looked at was nitrogen. 2. No, it's not a manifold. Each cylinder is hooked up to its own distribution system. 3. Yes, those are the ones. I'm...

Thanks for replying. I'll respond to each of your three paragraphs in turn. 1. Your 90% guideline makes a lot of sense to me. In my office, some of my colleagues will go all the way up to the relief valve set pressure, since the system upstream of the regulator is separate from the system...

Hi all, I am looking at a relief valve that has been installed downstream of a high pressure cylinder. The cylinder contains a gas at a pressure of roughly 2400 psig. The cylinder is hooked up to a regulator that lets the pressure down to approximately 100 psig. We have a relief valve...

Regarding the backpressure correction factor for balanced bellows PSVs in liquid service, Kw: Has anyone seen values for Kw for backpressure/setpressure ratios greater than 80%? I have a situation where I have a ratio greater than 80%, but I have never seen Kw values published for this range.

I don't think that's quite correct, although no one else said anything, so if I'm wrong, I hope someone will correct me! I believe that the first valve (the one set at 54 barg) can have 6% overpressure, so that its maximum relieving pressure is the same as the second valve (57.2 barg). Not...

Not that important perhaps, but I'm pretty sure that Crosby is with Anderson Greenwood, and that Consolidated is with Dresser.

Thanks to everyone for your varied and insightful responses. Quote from pleckner: "For an existing installation, I wouldn't hesitate to go up to 3.5%" It is an existing installation, and I too wouldn't hesitate to go up to 3.5%, but it's quite a bit large than that, unfortunately...

pleckner was certainly correct in predicting a myriad of opinions... By the way pleckner, kyu and hacksaw are two different people. hacksaw was right in stating that the PSV is protecting the piping only, not a vessel. As I stated in my original post, the PSV is there to protect the piping in...

API RP 520 Part II para. 2.2.2 recommends that the total non-recoverable pressure loss between the protected equipment and the pressure relief valve should not exceed 3 percent. I have a situation where I have a pressure regulator and a high-to-low pipe code break at the regulator. A PSV is...