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  1. gvn

    Duplex SS (UNS S31803) - Low Temperature

    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...
  2. gvn

    ISO 15156 & Stainless Steel

    Hi Grampi1, Can you please tell me in which section of NACE/ISO 15156 states that Operators can use 316 if they can document successful use in existing applications in similar services? Regards, GVN
  3. gvn

    ISO 15156 & Stainless Steel

    Hi Cokino, We have reviewed similar problem based on current NACE MR0175/ISO 15156 (Dec 2003)! Yes, Table A.2 limits Austenitic Stainless Steel (which includes SS316/316L) 60 deg C. If NACE is specified, SS316L is not acceptable to the current standard, if the operating temperature is greater...
  4. gvn

    Solid Inconel 625 Pipe Vs CS + Clad Inconel 625 Pipe

    MJC, I believe clad valves are CS valve body with weld overlay. For example, for soild Inconel 625 body specified to B564 (UNS N06625), the body can be say A350LF2 + 3mm Inconel 625 weld overlay. I understand that most of the reputable valve suppliers do supply clad valves, but these are not...
  5. gvn

    Can we make a hole for an attachment in a "TEE"?

    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...
  6. gvn

    Solid Inconel 625 Pipe Vs CS + Clad Inconel 625 Pipe

    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...

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