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  • Users: txcadman
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  1. txcadman

    Closure welds in B31.12 Hydrogen Piping

    I know there is a stipulation about a closure weld or weld that can be 100% X-rayed in lieu of hydrotesting in B31.3 process piping; however, is there any similar stipulation for a closure weld in B31.12 hydrogen piping?
  2. txcadman

    Compress and UG-45 on old vessels

    Tom, I came across your post "nozzle neck thickness output" regarding the UG-45 code requirements (see link below). I have a similar issue as plantguyjj, as I am evaluating a vessel fabricated in 1971 and the UG-45 requirements in the rating mode cause deficiencies in the nozzles. This vessel...
  3. txcadman

    Carbon steel pipe failure

    We have an application with a water seal that has a 1/4" thick x 40" diameter pipe supporting a large pipe 64" cap and 64" pipe segment to form a water seal. I suspect the 64" cap and 64" pipe segment is vibrating/moving on top of the 40" pipe due to flow and there was a failure of the 40"...
  4. txcadman

    Welding to non pressure support lugs after PWHT

    I have a heavy lift contractor asking if he can weld a lug onto an existing support trunnion in order to install this boiler. See the attached image. This trunnion is on a boiler that is PWHT, however, can the contractor weld the trunnion without any issue with PWHT because it is a non...
  5. txcadman

    Vessel Re-rate Calculations

    Do external non pressure retaining attachments (i.e. platform clips, ladder clips, skirts, lugs, etc.) have to be included in the calculations performed for vessel re-rate? Are re-rate calculations performed for pressure boundary components only? Does seismic and wind have to be calculated...
  6. txcadman

    1965 Stress Allowables

    I am re-rating an exchanger that was fabricated in 1965 and I am trying to find the stress allowables for the following materials. Would anyone be able to help me with this? SA-212B SA-201B SA-53B Any help would be apprciated.
  7. txcadman

    Pads for thermocouple studs

    I have a reactor that has studs welded to pads that are welded to the shell for thermocouple attachment. During installation a few of the studs were damaged and need to be replaced. I believe that we can remove and re-weld the studs to the pad without affecting the PWHT of the vessel. This is...
  8. txcadman

    Modification of internal support rings in caustic service

    I am addressing an issue with a new vessel (1-3/8" wall thk, SA516-70 material) that has not been in operation. The vessel is PWHT and is in Caustic service. However the internal support rings were fabricated incorrectly. The modifications to the tray support rings will need to be made which...

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