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  1. chayes

    Pressure Vessel Material Selection

    I am in the process of designing and procuring three large (approx. 20 Ft. diam.) pressure vessels and was hoping to get some additional insight on materials of construction. The vessels will house a zinc oxide catalyst and will be used for desulfurization of a hot process gas stream. The...
  2. chayes

    NDE Before or After PWHT?

    A client is fabricating a vessel which requires PWHT. They plan to UT the welds of the vessel to satisfy the NDE requirements prior to PWHT. Is it required to repeat the NDE after PWHT, and if anyone knows the specific section of the code (Section VIII, Section V?) that addresses this, it...
  3. chayes

    Impact Testing Requirements Per Section VIII UCS66

    I was hoping that this was the case. Thank you for the good info!
  4. chayes

    Impact Testing Requirements Per Section VIII UCS66

    I am reviewing weld procedres from a vendor fabricating a vessel for me from A516 Gr. 70 c/s. The wall thickness of the vessel is 1 1/4". The procedure that has been submitted does not include impact testing. My question is: My MDMT is 0°C. It appears to me that impact testing is required...

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