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  1. kb44

    Main Steam Piping Material

    I am replacing a main steam 45 due to soft spots and am wondering what the difference is between ASTM A335 Gr. P91 and ASTM A234 WP91. I think the A335 is extruded pipe while A234 is a fabricated elbow. This is a 3D fitting. Which material reference is appropriate?
  2. kb44

    Underground Air Storage

    I am looking at designing an underground air storage tank. Is this governed by ASME VIII? There is plenty of information out there on UL58 and underground vessels for combustible materials. However, this is for 400# air.

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