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  1. VFK

    Downside to oversizing an RF pad? And weld details for an an angled nozzle through an RF pad?

    At 700C you need to consider in-service degradation mechanisms affecting the SS316. If you're unfamiliar, as a starting point you can consult ASME-II Section D Appendix A-200, specifically A-207 475degC Embrittlement, A-208 Sigma-Phase Embrittlement, A-209 Laves phase embrittlement and/or API...
  2. VFK

    Studbolts for General Purpose versus pressure containing flange

    What additional design requirement needs to be specified to a fully-threaded, stud-bolt, ASTM F468M UNS N06625 Gr1 with ISO metric coarse thread so that its design is suitable for use as bolting for a pressure containing flange? Reason is F468(M)’s title is “General Purpose” fasteners and for...
  3. VFK

    Target bolt stress for a double gasket flanged joint - ASME PCC1

    What correction should be applied to the "fraction of gasket load remaining after relaxation" factor when performing target bolt stress calculations per ASME PCC1 App O Combined Component method for a flanged connection that has a sandwiched plate with one gasket on both sides? For example a...
  4. VFK

    Lifting lugs calculation: out of plane force

    API-RP-2A (offshore lifts) uses 5% of sling load for out-of-plane bending. Client specs tend to nominate the amount.
  5. VFK

    ASME VIII-1: Tubesheet extended as a flange (Type BEU Heat Exchanger) calculation

    A new gasket will be more reliable than keeping the original shellside gasket in-service, but this does not mean the in-service gasket is unreliable. My understanding is the shellside gasket will remain undisturbed providing the collar bolts tension is checked before and during the loosening of...
  6. VFK

    ASME PCC-1 Appendix O: Sfmax (maximum permissible bolt stress prior to flange damage)

    have you asked the original question to the owner of the software you're using? the author of WRC538 owns an engineering consultancy and wrote a Sfmax calculation software available for purchase from the consultancy website. However, I strongly recommend the training before you try and use it...
  7. VFK

    Thick U-tube tubesheet thermal differential stresses

    An existing BEU heater is being re-purposed. * The tubeside fluid will change from hydrocarbon gas to liquid hydrocarbon. * Either the existing U-tube-bundle will be plugged with mechanical plugs (20% of tubes) or a new U-tube bundle will be procured. Either way, there will be the same number...
  8. VFK

    Girth Flange Gasket Leaks due to Vessel Lifting or Handling

    @BJI and Christine - thank you for the feedback. Posting back: resolving the lifting moment into an equivalent pressure: 3% of the channelside design pressure, and 60% of the shellside design pressure. This results in a relative change in gasket stress of 2 for the channelside and 0.02 for...
  9. VFK

    Girth Flange Gasket Leaks due to Vessel Lifting or Handling

    @littleinch - thank you for your post. Yes, I'm working thru the asme-App2 and WRC538 calcs and was intending to compare the bolt loads and flange moments for the lifting case to the hydrotest case and design condition case as a sensitivity check, but tbh I think those calc methods have their...
  10. VFK

    Girth Flange Gasket Leaks due to Vessel Lifting or Handling

    @littleinch - the shellside is 150#, 16mm thk, has a few 14" nozzles, while the bonnet is 600#, 33mm thk and has two 28" nozzles. Hydro pressure shellside 25 barg, tubeside 116 barg. Pic attached. I greatly appreciate the support to date and the requests for more detailed information, however...
  11. VFK

    Girth Flange Gasket Leaks due to Vessel Lifting or Handling

    @r6155 - ...a pressure equipment that is bolted to a piping system consisting of multiple flanged joints, valves, instruments, etc. Once everything is assembled the system, including the vessel/HX is leak tested and inerted prior to introducing hydrocarbons. Thank you for the insights. Could...
  12. VFK

    Girth Flange Gasket Leaks due to Vessel Lifting or Handling

    Hmm, just a thought on the welded lugs-bracing idea - I imagine they will need to be beefy to bear the loads so a considerable amount of weld would be required. Then we would need controls to limit the effect of the welds thermal expansion/contraction on the gasketed joint, right?
  13. VFK

    Girth Flange Gasket Leaks due to Vessel Lifting or Handling

    Thank you all for the prompt and insightful feedback. Oh its not my first time here, just first time with this email address. @GDD - this is an upcoming scope and the bonnet and bundle have never been removed. @r6155 - a) the heater has lifting trunnions which means slings will be used. b) OP...
  14. VFK

    m & Y factors for 13 Cr-Mo 44 Metal Grooved Gasket

    Consider galvanic corrosion risk if introducing graphite (most noble material). Other soft facing for kammprofile is PTFE. If you stick to the original gasket construction, suggest you ask a reputable gasket manufacturer for the recommended m/y values.
  15. VFK

    Expired Fire test certificate

    This sounds very similar to a project I recently moved on from. One way to demonstrate to the client the gap is closed is to request the witnessing agency to issue a letter explaining the basis/origin of the expiration date. Otherwise I agree with @bcd response, citing API607 does not mandate an...
  16. VFK

    Girth Flange Gasket Leaks due to Vessel Lifting or Handling

    An existing BEU type heat exchanger, 1200 mm ID (~47") and weighing 10,000 kg (~20K pounds), needs to be removed from an offshore oil rig and brought to a workshop on land so that the tube bundle, weighing 5700 kg and 2000mm long, can be replaced. The reason this scope cannot be performed on the...

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