WELDER QUALIFICATION as ASME Section IX

I want to qualify a welder with the size of pipe is DN 65(21/2 inch) .so i want to know what is the maximum & minimum dia. range as per the ASME Section IX, Edition 2019(Table QW-452.3).

ASME IX 2019 - Table QW-452.3. DN65 grouped the outside diameter of test coupon NPS 1" (25 mm) to 2-7/8" (73 mm).

  • Minimum diameter: 25 mm.
  • Maximum diameter: Unlimited.

Maybe you confusion between outside diameter (OD.) with NPS 1" or DN25.

  • OD 1" = 25 mm
  • NPS 1" = 33.4 mm
  • DN25 = 33.4 mm.
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