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  1. vragle

    A-212-B versus A-515

    thread177-29735 I am working on an old vessel that is constructed of A-212-B. Thickness is 2.35 inches. A-212-B was replaced by A-515. In regard to low temperature operation, the exemption curve UCS-66 lists A-515 under Curve B with no mention of whether or not it is normalized. Spec A-515...
  2. vragle

    Low temperature effect on Thickness measurements

    I am evaluating a pressure vessel that operates at very low temperatures. It was built in 1982 and has been in what should be non corrosive service since that time. The original thickness was 1 inch. The latest thickness values range from .805 to .808 on the entire vessel. The thickness...
  3. vragle

    Evaluation of Pressure Vessel LTA Per API 579

    I recently performed a rerate of a 55 year old vessel. Based on inspection data there was some general thinning in the feed area, and everything else was in good order. The inspection report mentioned a goove adjacent to a nozzle that was described as “0.080 deep and about 1.5 inches long”...

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