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  • Users: erkuts
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  1. erkuts

    Tubesheet blind tapped hole for pulling out bundle

    Dear Experts, If we drill tubesheet for blind tapped hole for pulling out bundle. Should we plug with bolt this blind tapped hole. ASME Section VIII UG-43(d) states "The distance from the inside sur-face of the vessel to the bottom of a drilled hole to be tapped shall not be less than the...
  2. erkuts

    Heat Exchanger hydrostatic shell test pass but tube hydrostatic test fails ?

    Hello, I would like to ask a question about hydrotesting. We have a fixed tubesheet heat exchanger in our facility and it pass shell hydrostatic test at 9 bar but it fails when we test tubes at 9 bar. Pressure gage decreases and we observe a leakage shell drain. What is your recommendation...
  3. erkuts

    Etan Cracking furnace tubes failure

    Hello Dear Experts, 1. In April-2017, Etan Cracking furnace tubes, U elbows and hanger supports were completely renewed as planned. 2. On August-2019, the furnace was stopped to decoke. As a result of the inspection activities, the magnetization results were found to be normal and the percent...
  4. erkuts

    Phthalic Anhydride (PA) plant Ageing Drum corrosion problem

    Hello, We observed a leakage in the shell of Ageing Drum Phthalic Anhydride (PA) plant. After inspection of inside of Carbon Steel material shell, severe corrosion can be also seen in other areas. I consider that phthalic acid occured and metal corroded. Operation team indicates that there was...
  5. erkuts

    Forged steel material specifications

    Hello, Could you help us to find out our seperator material related specifications? It can be seen below chemical composition. DIN 40NiMoCr10 4 is a specifications that i could find closest specifications. Is there any welding recommendations for this material? Best Regards,
  6. erkuts

    ASME 31.3 Category M service examination paragraph?

    Hello everyone, I could not find ASME 31.3 Category M service examination paragraph. Table 341.3.2 Acceptance Criteria for Welds — Visual and Radiographic Examination. Normal fluids and Category M are in same column. Under the "341.4 Extent of Required Examination" it can be seen that Normal...
  7. erkuts

    dry air humidity when pneumatic test

    Hello, What dry air humidity value must be before pneumatic test after hydrostatic test ? In which API, ASME standart i can look ? Thanks,
  8. erkuts

    Design Temperature when Full Vacuum Conditions?

    Hello, I would like to ask a question. When i looking design values of our pressure vessel, design pressure 27,07/F.V and design temperature 860/121 Celcius. What dooes 121 Celcius or 250F value mean? Is it permissible outside temperature or another issue ? Thanks,

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