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  1. pianoman1

    Support for piping across long spans

    Littleinch - you're right, the snow and ice don't stay around long on insulated steam piping, but any components I add will need to consider them. I have browsed the pipe bridge websites, I'll pursue that with a couple providers and see what light units cost.
  2. pianoman1

    Support for piping across long spans

    MJCronin - I think the mill has some OSHA concerns with the quantity of Helium required onsite...
  3. pianoman1

    Support for piping across long spans

    Interesting, I might be able to make that work with the right cable and a ring every ten feet or so. I have to run about 400 feet through mostly open space, in that 400 feet there are structures for old chip lines about 50 feet apart. Trying to run almost horizontal, 1/4" per foot slope just...
  4. pianoman1

    Support for piping across long spans

    That's wild, Kevin. Unfortunately this is for steam, so arched spans aren't practical from a condensate management point of view, and pipe deflection versus pitch need to be managed as well. We have chip blowlines that are up to 36" diameter, thin wall but have stays and guy-wires so they span...
  5. pianoman1

    Support for piping across long spans

    Average height above ground would be 16 to 20 feet.
  6. pianoman1

    Support for piping across long spans

    I have a paper mill client that wants to replace about 750 feet of underground 3" steam piping with above-ground piping. One problem is that the structures he has available to hang pipe from are mostly 50 to 60 feet apart. I've been looking for either light pre-fab pipe bridges or some...
  7. pianoman1

    Vapor collapse in Condensers

    Thanks for the responses. Actually I had the original manufacturer check the shell rating, they came back and said it was good for 3 psig vacuum only. And yes, I used the latent heat of vaporization of the vapor to get to the timing. It makes sense when you cosider how little mass is in the...
  8. pianoman1

    Vapor collapse in Condensers

    I have a client that has an old shell and tube condenser that is not rated for full vacuum on the shell side. Based on the operating conditions, I've determined that the vapor mass could condense in about 1 second if the shell side were closed in and the cooling water left running, requiring...
  9. pianoman1

    Decommissioning pressure vessels

    Thanks for the feedback, will follow up.
  10. pianoman1

    Decommissioning pressure vessels

    I have a client that would like to decommission an old distillation column; it's unused and he wants to get it off his annual inspection list. I'm contacting my state boiler inspector for his input, but I'm surprised that I can find nothing in BPVC Section VIII or online on how to do this...
  11. pianoman1

    Forces on piping while safety is lifting

    Now I'm the one laughing, thought Gator was crapping on the sketch. Anyway, I got this figured out, it really is as simple as it looks.
  12. pianoman1

    Forces on piping while safety is lifting

    OK, so it's not my best artwork, hastily prepared by a busy guy, you got an intelligent response on the actual content of the question?
  13. pianoman1

    Forces on piping while safety is lifting

    Thank you for the responses. Here's a sketch of the situation. In my stress analysis program I don't have the option to post this as an offset force and let it figure it out, so I need to input both force in the Y-direction and moment. Is it this simple - post the vector forces in the Y and Z...
  14. pianoman1

    Forces on piping while safety is lifting

    I'm doing some analysis on a 24" steam line, it has an 8T10 safety mounted on top, side exit perpendicular to the pipe run with a 10" elbow turning vertically up and dumping into a 12" drip pan elbow. I calculated the API 520 Part II thrust force, and was just going to apply the moment created...
  15. pianoman1

    Bodenheimer's paper on 'Channeling in Bleach Towers'

    I noticed an unsuccessful search for this paper and had a copy, so I thought I'd post it. Even with Bodenheimer's help and 30 years experience, I find MC stock piping systems a continuing challenge to get...
  16. pianoman1

    ABZ 402 buttefly valves

    Thanks for your responses. We'll be sticking with Milwaukee or Dezurik for HP butterflies.
  17. pianoman1

    ABZ 402 buttefly valves

    Thanks, but that's kind of a generic response, I was hoping for something more specific from someone with direct experience with this manufacturer. All these high-performance butterfly valves are manufactured to meet API 609, API 598, API 607, MSS-SP-68, so theoretically they're tested far...
  18. pianoman1

    ABZ 402 buttefly valves

    Anyone have any experience with these valves? I've been partial to a couple other log-standing manufacturers' high-performance butterflies, but I have vendors starting to quote these as a lower cost option. Thanks for any feedback.
  19. pianoman1

    Enthalpy tables for IPA

    Thanks you!
  20. pianoman1

    Enthalpy tables for IPA

    Thanks. I was looking for pure IPA enthalpy tables, which I could not find, but this looks useful. I'll see if it solves my problem.

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