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Recent content by Hurmanetar

  1. Hurmanetar

    heat treatment for c.st pressure vessel

    Just curious the reason for putting stainless nozzles on a CS pressure vessel?
  2. Hurmanetar

    Air-Cooled Heat Exchanger - Header Box Vacuum Rating?

    I second what SnTMan said. I've yet to see a case on a typical welded box header air cooled heat exchanger where 14.7 PSIG external pressure would come anywhere close to being the governing design case, but if you have to show calcs proving it, follow Appendix 13, section 13-14 "VESSELS OF...
  3. Hurmanetar

    R-stamp required, or Corrected Copy of U1A? Vessel has not left manufacturer facility

    Our AIA came back and said that in both cases an R-stamp is required.
  4. Hurmanetar

    R-stamp required, or Corrected Copy of U1A? Vessel has not left manufacturer facility

    david339933, thank you for the definitions and references. I think it is clear from these definitions that the NBIC "may" be used in both of these cases. But as to whether or not it is "required" to be used and R-stamp "required" to be applied, I still see some gray area. Corrected U1A's are...
  5. Hurmanetar

    R-stamp required, or Corrected Copy of U1A? Vessel has not left manufacturer facility

    Talked to our AIA and he thought since the vessel hasn't left the shop, a corrected U1A can be submitted instead of an R-stamp, but he will call his boss and check to be sure.
  6. Hurmanetar

    R-stamp required, or Corrected Copy of U1A? Vessel has not left manufacturer facility

    Metengr, where can these definitions be found? I know I read once that if the OEM still owns the vessel because it hasn't left the shop yet, then the vessel is still under the code of construction rather than the NBIC, but I cannot find where I read that. Another similar situation but instead...
  7. Hurmanetar

    R-stamp required, or Corrected Copy of U1A? Vessel has not left manufacturer facility

    Pressure vessel fabricator has 4 pressure vessels that were fabricated 2 years ago. U1As signed off and submitted. Customer did not want to take delivery so they never left the fabrication facility. Now the customer wants to lower the MDMT form -20 to -40 which will require the manufacturer to...
  8. Hurmanetar

    Gas scrubber capacity

    As zdas04 said, there are many criteria to look at. Assuming this scrubber has a mesh pad, the ID of the vessel has to be sized for the condition. If this is 20" OD with 1/2" wall, you have a 19" ID which gives a superficial velocity of 4.77 fps on the 2 MMSCFD condition and 9.53 fps on the 4...
  9. Hurmanetar

    Fluid force on a pipe flange

    Like others have said, the force acting to pull the flanges apart would be P x A so if the ID is 8", ~2500 lbs neglecting any supports. I was curious about flanges with set screws so I googled that and found Zip Flanges... is that what is being used...
  10. Hurmanetar

    Hydro test Pressure Increment per Minute

    I don't think there is any requirement in ASME VIII for pressure up rate or pauses. I've seen a lot of customer specs and only recall seeing one that specified pause intervals on the hydro. I think they required a pause at half the design pressure, again at design pressure, and then go on up to...
  11. Hurmanetar

    NACE question

    Mous1747, there is no such thing as "NACE certified". The NACE MR0175 specification states that it is the end user's responsibility to determine the specific service environment (pressure, temp, and partial pressure of H2s, CO2, pH, amount of chlorides, and is liquid water present?) and use the...
  12. Hurmanetar

    Heat transfer efficiency vs. coolant mass flow rate

    MRDAGERUS, you are correct. The coolant does not need "dwell time" inside the engine or inside the cooler/radiator for efficient operation of the cooling system. I'm guessing this myth has developed because a slower flow rate will likely result in a lower cooler outlet temp (but a higher average...
  13. Hurmanetar

    SA-210-A1 vs. SA-179 in air-cooled heat exchanger

    SnTMan, thank you for the correction on terminology. Don't know why I had "yield" in my head. I have corrected to "allowable".
  14. Hurmanetar

    SA-210-A1 vs. SA-179 in air-cooled heat exchanger

    Background: In the ACHE industry SA-214 welded carbon steel (11400 PSI allow. stress at 350 F) is by far the most common material for finned tubes in non-sour applications. If a slightly higher allowable stress is required or if seamless is desired, then seamless SA-179 carbon steel (13400 PSI...
  15. Hurmanetar

    Charpy on MTRs

    This is for some box headers on an ACHE and the thinner plate is 1/2" and 5/8" while the thicker plate is 1", 1.25" and 1.375". At those thicknesses the curve D gives -30F, -21F, and -18F so maybe that is where the confusion is coming from. But the governing thickness is the thinner plate, so...
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