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  1. trottiey

    ASME External Presssure Test

    You might want to refer to ASME PVHO-1. Stress is a biological mechanism that improves strength at the expense of thought. It is counter-productive to solving technological problems.
  2. trottiey

    TVA Browns Ferry: Local Blackout, On Emergency Power Due To Tornado

    rmw, I guess you could RF my posts as well. But it sounds like you support my right to criticize others, just as I would support your right to criticize me. I am grateful that we share this common ground. The transparency of the nuclear industry is important to me as well, which is why I spent...
  3. trottiey

    TVA Browns Ferry: Local Blackout, On Emergency Power Due To Tornado

    Settle down. This Browns Ferry tornado event doesn't even qualify as an accident on the INES scale. I see no basis for the allegations of cover up or information control in this case. Discussion of sewage plants and political rants do not belong in this forum. You can get the raw Fukushima...
  4. trottiey

    TVA Browns Ferry: Local Blackout, On Emergency Power Due To Tornado

    That becomes a question of what frequency of accident are you prepared to accept. The marketing brochures say that core damage accidents should only happen once per 10,000 reactor-years, and that would imply that INES level 6 or 7 accidents should be much less frequent than that. But so far...
  5. trottiey

    extrapolated CTE?

    I'm not sure that interpolation of CTE has to be linear. There's an interpretation that says interpolation of stress allowable has to be linear, but nothing I know of on CTE. When using the external pressure tables, the code says "linear interpolation or any other rational interpolation method...
  6. trottiey

    Tips on buying pressure vessels from Asia

    Chicopee, could you stop spreading an urban legend? As I've pointed out to you before, I'm pretty sure that even if the Chinese government's ban on Chinese piping was ever real, it was just a temporary knee-jerk reaction to the catastrophic failure of a counterfeit P91 pipe in the main steam...
  7. trottiey

    Is aditional support required when PWHT a vessel?

    Thanks for posting back with the outcome! Glad to hear that reason prevailed. Stress is a biological mechanism that improves strength at the expense of thought. It is counter-productive to solving technological problems.
  8. trottiey

    Third World Countries

    DFAS 252.225-7014 was deleted on July 29, 2009. Buyers are advised to stop flowing down a non-existent clause. https://dap.dau.mil/aap/pages/qdetails.aspx?cgiSubjectAreaID=35&cgiQuestionID=105706
  9. trottiey

    Fukushima No. 1 loss of coolant due to earthquake

    I'm guessing that Keith is referring to the RPV gauge pressures? They're slightly negative, but only by 1% or so of the full operating pressure. That's probably within the normal instrument error band. I'm guessing that the RPV's in units 2 and 3 are fully vented to the atmosphere, and the true...
  10. trottiey

    Relief Requirements for Low Pressure Coded Vessel

    I would say that if the code stamp is removed, the name plate is destroyed, and there is nothing that could mislead someone to believe this is a pressure vessel, that means you now have a funny-shaped bucket. It is legal to put a tight-fitting lid on your bucket, even though a little bit of...
  11. trottiey

    Fukushima No. 1 loss of coolant due to earthquake

    The latest plant parameters still list the reactor water temperature as "Impossible collection due to low system flow rate," and most of the RPV temperatures and pressure are still "under investigation." www.nisa.meti.go.jp/english/files/en20110418-1-3.pdf The highest RPV temperatures reported...
  12. trottiey

    Section VIII jobs

    Interesting. Rustbuster, are you aware of CSA B51 section 4.10.2, which starts off as follows: "Manufacturers not holding an ASME Certificate of Authorization may be eligible..." Could you be more specific as to who or what law or regulation requires ASME stamps in Canada?
  13. trottiey

    Section VIII jobs

    ASME stamps are not required in Canada; they have their own certification system. You can find manufacturers with Canadian certification through this link: http://www.tssa.org/regulated/boilers/find/default.asp
  14. trottiey

    ASME VIII U-1(e)(1) Advice

    Ah, I get it. New weld b would be a piping weld, but by grinding out the coupling threads I think you've altered your pressure vessel. I'm guessing the manufacturer's data report claims it has a threaded nozzle there.
  15. trottiey

    ASME VIII U-1(e)(1) Advice

    I'm a little confused by the phrase "the nozzle is cut off at the nozzle side," so let me see if I have this straight: vessel - coupling + pipe - valve - stuff ? Was the pipe nipple included in the manufacturer's data report, or just the coupling? As long as vessel boundary stopped at the...
  16. trottiey

    ASME 8 Div 1 certification process for PV

    It depends on your jurisdiction, but someone with an R stamp could usually do this as an alteration under NBIC NB-23. You're still going to be referring back to VIII Div. 1 as the code of construction. Do you have more specific questions?
  17. trottiey

    Bolt material

    Thank you unclesyd; I overlooked the temperature, which rules out both of my suggestions.
  18. trottiey

    Bolt material

    Grade 8 bolts are not permitted by the ASME boiler code. You can consider SA-325, which is similar to grade 5, or SA-354 if you really need grade 8 equivalent strength. SA-354 is usually a custom order.
  19. trottiey

    Qualifying ASTM B16 C36000 Material Under BPVC Section VIII

    See Section VIII Div. 1 UG-10. Compare your existing material test results to SB-283 to see if it fits. If any tests are missing, you'll have to get those redone.
  20. trottiey

    Qualifying ASTM B16 C36000 Material Under BPVC Section VIII

    Code cases don't have a "scope." The "inquiry" is as follows: "Under what conditions and limitations may the following materials be utilized in the construction of the bodies, bonnets, and yokes of pressure relief valves, housing for breaking or buckling pin devices, and holders for rupture...

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