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Recent content by jrpower

  1. jrpower

    Manual Valve - Stem-Disc Separation

    Thank you guys for all of your expertise and insights; it has really given me a much better understanding not only into this type of failure mechanism, but also into valves, in general. This will help me in my overall thought process in the work I do in risk analysis. Many in my area have no...
  2. jrpower

    Manual Valve - Stem-Disc Separation

    Also, what about needle valves and their "linked" area as discussed above in MRs first post? And what are your thoughts on it's susceptibility? Thanks.
  3. jrpower

    Manual Valve - Stem-Disc Separation

    Thanks. I've seen the cheaters used on the larger valves, not really on the smaller ones, and not on the compressed air systems. On the compressed air systems I've seen a few valves sometimes harder to turn than others on the larger header lines, but again haven't seen a cheater used on those...
  4. jrpower

    Manual Valve - Stem-Disc Separation

    Thank you guys so much for the information, these are the insights I was hoping for. A couple more related questions: Have the failures you've seen always been in running/flowing systems or have there been cases where the failure was found when the plant went to start a standby or backup...
  5. jrpower

    Manual Valve - Stem-Disc Separation

    You are correct, this is not my area of expertise and it is a failure mechanism I don't fully understand (thus no offense taken), and thus I thought I would ask you guys who are more familiar with valves. I'm a 20 year veteran Engineer of my industry, but again not with valves, and in my...
  6. jrpower

    Manual Valve - Stem-Disc Separation

    I don't know valve failure mechanisms all that well, and I'm trying to understand the failure mechanism of Valve Stem-Disc Separation (sometimes called a plugging failure in Probabilistic Risk Analysis (PRA)), in particular for Manual (hand) valves. Is this failure mechanism plausible for...
  7. jrpower

    fire water pipe rupture calculation

    TD2K, You are correct in saying that the Main Fire header is larger. It is a 12" header then to a 10" header that branches off to 6" headers then down to 4" branches that break down further to then 1", 2" and 3" branches with sprinkler heads. As for the pump's suction pressure, there are a...
  8. jrpower

    fire water pipe rupture calculation

    I have a fire protection piping system with 3" and 4" schedule 40 piping that I am trying to calculate the flow rate from various sizes of a pipe crack/breaks up through a full guillotine rupture of the pipe. I am trying to use simple calculational methods to estimate the break flow rates...
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