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  1. StressGuy

    CAESAR II Error incore solver

    You're going to need to reach out to Hexagon support for this one and create a support ticket. https://smartcommunity.hexagonppm.com/
  2. StressGuy

    A333 Gr 6 Minimum Temperature

    What you a doing by invoking the paragraphs you mention is not a true "stress check" as we normally think about it for B31.3 It is a check of the "operating" stress (which doesn't have a code allowable) without stress intensification factors applied vs the basic allowable stress for the...
  3. StressGuy

    When to utilize Caesar's liberal stress allowables?

    I certainly came of age with the default "conservative" allowable stress mentality. For the most part, we still keep it as the default for the first pass. For many systems, pipe stress isn't the limiting factor anyway. Nozzle loads and structural loading tend to be the real limits. I will...
  4. StressGuy

    Straight run for vertical pump suction piping?

    I've got an update to report on my case. While folks are in agreement that API 686 has some ambiguity and apparent internal conflict between what that figure B.3 says and what the body text says, the client specs do not. Our client standards are clear on the 5D with no exception for top/side...
  5. StressGuy

    Straight run for vertical pump suction piping?

    I've had a rather strange issue come up and I'd like to see how it compare with everyone else's experience. I'm sure most of us here are aware of API 686 for "machinery installation" and the requirements for piping design. Specifically the 5D of straight run requirement. Chapter 6, Section 3...
  6. StressGuy

    How to Manage Pipe Support Lift-Off in Stress Analysis

    In my experience, my clients see "design conditions" as being the basis for calculating the required wall thickness of a pipe. Our line list automation works on that basis. The "Flexibility" temperature for stress analysis is a different concept. We generally state in our design basis that...
  7. StressGuy

    Pipe wall thickness sizing

    I am boggled that you can be dealing with a PSV set pressure, but not have a line list that has set the design conditions.
  8. StressGuy

    How to Manage Pipe Support Lift-Off in Stress Analysis

    As I've gotten older, I've come to realize that springs are better avoided when possible. As for liftoff, if your stresses, equipment loads, and deflections are acceptable without the support active (i.e. lifted), then let it lift. Springs should be used when that support going inactive...
  9. StressGuy

    Repad on structural supports attached to SCH 10S pipe

    As others have noted, Caesar won't check the local stresses that you need to consider for a support attachment - this is true for dummy legs, lugs, saddles, whatever. That's just not within the capacity of a Caesar beam element model. The Paulin suite of tools is really something every stress...
  10. StressGuy

    H2S release kills 1 at PEMEX Houston Refinery

    I'm surprised it's only three so far $1 million lawsuit filed by injured workers in Pemex Deer Park hydrogen sulfide release “If owners and operators of oil refineries follow the proper policies and procedures designed to protect people, then the release of highly toxic gases does not happen,”...
  11. StressGuy

    H2S release kills 1 at PEMEX Houston Refinery

    At low levels, you can definitely smell the rotten egg scent of H2S. However, at levels that rise to immediate danger, you nasal receptors get overloaded and you don't smell it anymore. Edward L. Klein Pipe Stress Engineer Houston, Texas "All the world is a Spring" All opinions expressed...
  12. StressGuy

    H2S release kills 1 at PEMEX Houston Refinery

    Shelter in place has been lifted. Death toll now at 2 with another 35 injured. Edward L. Klein Pipe Stress Engineer Houston, Texas "All the world is a Spring" All opinions expressed here are my own and not my company's.
  13. StressGuy

    H2S release kills 1 at PEMEX Houston Refinery

    Still developing, so no details on the cause, but local areas are still ordered to shelter in place. PEMEX Refinery H2S leak H2S is pretty nasty and most of us local have had to go through safety awareness training specifically for it. Many facilities require folks to wear H2S monitors where...
  14. StressGuy

    Pipeline Fire near Houston, TX

    The driver of the SUV has finally been identified. And, for the love of all you hold dear, avoid the comments section. People are terrible. human-remains-found-in-suv-that-struck-deer-park-pipeline-identified Edward L. Klein Pipe Stress Engineer Houston, Texas "All the world is a Spring"...
  15. StressGuy

    Pipeline Fire near Houston, TX

    The fire has died down significantly and investigators have been able to get into the area to begin their work. Not surprisingly, they found human remains in the car. That cannot have been an easy thing to look upon. Human Remains Found Edward L. Klein Pipe Stress Engineer Houston, Texas...
  16. StressGuy

    Pipeline Fire near Houston, TX

    Wow, that video of the crash is impressive. The eye witness report from earlier suggest the driver had some kind of medical incident and ended up flooring the accelerator. It was definitely moving fast in that video clip. Edward L. Klein Pipe Stress Engineer Houston, Texas "All the world is...
  17. StressGuy

    Pipeline Fire near Houston, TX

    The wild thing to me is that even this afternoon, nothing about the driver has been released. I would assume she was killed when her car got blown off after colliding with the valve. She certainly couldn't have survived the heat when the fire kicked off. Edward L. Klein Pipe Stress Engineer...
  18. StressGuy

    Pipeline Fire near Houston, TX

    This was quite the hot topic for those of us in the Houston area yesterday: La Porte Pipeline Explosion It ended up being a case of an out of control car from the adjacent Wal-Mart parking lot drove into the right-of-way, crashed through the enclosure fence, and broke the line. It made for an...
  19. StressGuy

    Rubber Exp. Joint Gusset Plate Thickness.

    I'm curious why you're trying to design these. They should have been designed and provided by the expansion joint manufacturer in their scope. You really don't want to hydrotest that with the expansion joint in the system - especially at that high of a pressure. Why is the test pressure 4x...
  20. StressGuy

    thread775-227137 Hi guys, Sorry

    So, first off, there is no NEMA SM-23 anymore. The API codes have all adopted their versions of the NEMA methodology for turbines and compressors. NEMA SM-24 isn't a replacement for SM-23, it addressed different machinery. That said, I see V14 still has an SM-23 section in the equipment...

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