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  1. RVAmeche

    allowable stress value in creep region for 1.0345

    I meant if you know who's buying/sourcing the material, ask them for detailed material property information (assuming new construction). That's not commonly something my company gets involved with so I don't have any leads for that.
  2. RVAmeche

    allowable stress value in creep region for 1.0345

    If you have questions/concerns about the EN standard data I would try to contact a fabricator or someone who can tell you what their piping material properties are.
  3. RVAmeche

    allowable stress value in creep region for 1.0345

    If the EN standard requires a safety factor, I would hope the published data is with those safety factors applied? Or it otherwise says this is the raw data. Is there a spelling error in the safety factor table? The hours listed don't line up with the material hours given. I would expect it to...
  4. RVAmeche

    Very High Temperature Piping Stresses

    Our process temps ended up coming down to ~1,800F which go us back into the realms of something being possible. 1,200C simply seems impossible for metal piping construction since every alloy is very weak at that point or about to melt haha. The final metallurgy report recommended Sanicro 25...
  5. RVAmeche

    Titan sub noise heard on board support ship.

    For a company relying so much on the acoustic monitoring system its really bizarre that Stockton and Co just ignored the results/sounds and kept saying its fine, every sub makes noises.... Like once the data changes significantly after Dive 80 its clear you need to get a new hull or not put...
  6. RVAmeche

    Titan sub noise heard on board support ship.

    Ahh that makes a lot of sense
  7. RVAmeche

    Titan sub noise heard on board support ship.

    Agreed. But my understanding was the classing agencies don't even have a set of standards they could've applied to the vessel to class it if they wanted to. Not sure if OceanGate had done proper engineering/testing to show that it was good for a certain number of dives if they could've gotten...
  8. RVAmeche

    Titan sub noise heard on board support ship.

    Also the whistleblower protection or lack thereof was comical. What exactly is the protection if they can still just sue you 6 ways from Sunday to make you backdown and withdraw the complaint?
  9. RVAmeche

    Titan sub noise heard on board support ship.

    I think one of the core issues with classing is they don't have any rules for submarine carbon fiber construction so it wouldn't have been able to pass? That seemed to be one of OceanGate's primary claims, outside of saying they're useless and just a paperwork exercise.
  10. RVAmeche

    Titan sub noise heard on board support ship.

    Netflix is releasing a documentary as well this Wednesday; not sure if it'll be significantly different or tell it from a different perspective. Josh Gates putting together all the BS Stockton was selling like we've done 53 dives (49 were on the other hull) and getting so upset after the test...
  11. RVAmeche

    Surge Protection

    The surge anticipating valve seems to be a hydraulically actuated valve, similar to Cla-Vals used in utility/fuels piping systems. it probably senses changes in pressure and responsds, pretty neat.
  12. RVAmeche

    Q. Regarding Allowable Nozzle Loads and Moments in HI 9.6.2 vs. API 610

    With regards to #2, most industry pumps (at least in my experience) are not API 610 pumps where most clients/projects don't want to pay for the extras associated with a 610 pump. The 610 pumps I've dealt with all had nozzle loads that matched the specifications table. Non API 610 pumps commonly...
  13. RVAmeche

    Deaerator Usage In Power Plants

    Only reason I've ever heard of not wanting a DA is very small systems (like a maintenance shop boiler) where they don't want to spend the extra money.
  14. RVAmeche

    How to properly analyze a flange at a boiler in stress analysis?

    I use Caesar II so my terms will be from that program, they all vary slightly. In my experience using Caesar II, I generally stick to matching the stated thermal growth of the nozzle (ie, at 400F it will grow up 0.25" and laterally 0.125" or something) by inputting it as a displacement rather...
  15. RVAmeche

    Air Traffic control failures

    Gotta line pockets and steal govt funds in every way possible. Versus just ya know, hiring an adequate amount of people and providing training.
  16. RVAmeche

    Clevis hanger support with rod

    I think there's a terminology issue here. Non-spring supports in Caesar II are called rigids (clevis, rollers, shoes, etc all are rigids) while spring supports are hangers. A rigid +Y representing a clevis will still move laterally (typically check for 4 deg rod angle if its tight) and show lift...
  17. RVAmeche

    Open-source hydraulic modeling software

    If you're just doing relatively simple stuff, making a quick calculator based off Crane TP #410 or using any of the online calculators available would be your cheapest bet.
  18. RVAmeche

    How to Manage Pipe Support Lift-Off in Stress Analysis

    Previously you may have had something like: Case 1 = Operating Case (support lift offs but no allowable stresses) Case 2 = Sustained Case (as-installed, no lift offs) Case 3 = Expansion Case (total stress range, just used for allowable stresses, no lift offs) Without careful review of Case 1 you...
  19. RVAmeche

    How to Manage Pipe Support Lift-Off in Stress Analysis

    David, So in Caesar II that's handled via their "alternate sustained" cases - these are basically sustained stress checks based on your operating case so if you have support lift off scenario, you'll see the increase in sustained stresses in those cases. The previous general discussion of...
  20. RVAmeche

    Very High Temperature Piping Stresses

    The more information we get the more I'm skeptical of the 1200C limit too. I suspect that's a worst case for the heater, but due to the BTUs the heater lists there's no way they're getting up to that temperature. That'll be a fun conversation with the client. Thanks for the information Ed. If...

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