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  1. Aberswn1982

    ASME B31.8 Location factors A,B,C,D

    I believe location classes from early B31.8 revisions were defined as A, B, C, D. I am looking at calculating a hoop stress tmin for a piece of equipment built in 1970 to the 1967 revision of B31.8. I just wanted to confirm the design factor of each A, B, C and D class. And is it a case that the...
  2. Aberswn1982

    Structural stability of unfired pressure vessel tmin for low pressure cylinders

    Hi Brkmech Thanks for the reply, this is for the small number of occassions (one example that i can think of is a reboiler BS5500 vessel and is only designed to 4bar) where the hoop stress is low but there may be external/mechanical loading that results in the tmin requirements for structral...
  3. Aberswn1982

    Structural stability of unfired pressure vessel tmin for low pressure cylinders

    I have come across a rule of thumb believed to be used for cylindrical pressure vessels that are designed to a low pressure and the hoop stress is not the driving factor. I am told (as a rule of thumb) this can be applied, something like : (Diameter/650) + 1.8 mm OR (Diameter/1000) + 2.5 mm I...
  4. Aberswn1982

    api 579 rt factor

    Hi all, tried this in the API forum but not had any replies so trying to post it here.......any views welcome thanks: Conflicting Rt values?? Any body have any views or guidance for me; When completing a local metal loss assessment to API 579 part 5, I complete the steps for a level 1...
  5. Aberswn1982

    API 579 Part 5 Rt calculation

    Conflicting Rt values?? Any body have any views or guidance for me; When completing a local metal loss assessment to API 579 part 5, I complete the steps for a level 1 assessment as per section 5.4.1 for a certain size defect of x longitudinal width and x amount of pit depth and it will satisfy...
  6. Aberswn1982

    Pressure vessel nozzle loads

    hi gr2vessels, thanks for the reply, design calcs? The plant is 40 years and documentation is poor. In some cases, definitely not all(!), we may have a GA drawing if we are lucky, definitley do not have the design calcs. Plant ownership has been numerous and handed over many times, orignal...
  7. Aberswn1982

    Pressure vessel nozzle loads

    For example, internal corrosion found on the bore of a nozzle on a horizontal, saddle supported vessel. Nozzle is a 24inch opening and connecting pipework is a long pipe run taking the contents from the vessel off to another part of the plant. The corroded nozzle remaining wall thickness may...
  8. Aberswn1982

    Pressure vessel nozzle loads

    My question is regarding assessment of defects in pressure vessels and defining accurate loading boundary conditions; If I have to assess (be it hand calculations or FE analysis) a vessel with an identified defect (say internal corrosion - local thinning), how can I obtain suitable nozzle...

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