Per ASME B31.3, Duplex SS can be used without impcat test up to -60 deg F (irrespective of thickness).
However, per ASME VIII Div 1, para UHA-51(d)(3) impact test is required for nominal material thickness greater than 10mm even for -20 deg F and warmer.
Any clarification on the above anamoly...
We have a Class 1500# piping system designed to ASME B31.3. Piping is Duplex SS (UNS S31803), 4"NB, 80S. We would like to have a 1" hole drilled radially on the Tee & weldolet type branch welded for Chemical Injection. Is this permitted by B31.3 Code? Also, is it permissble to cut the TEE say...
We have significant amount of Inconel 625 piping being specified for an offshore facility containing sour service Gas with wet H2S, CO2 and Chlorides (aggressive service). Is there a cut-off with respect to diameter of pipes and thickness for deciding between Solid Inconel pipes Vs CS + Clad...
