Product identification markings accordance to ASME B16.11

Identification markings

An actual marking on product shall reflect that product has manufactured accordance to the specification and its original. It is necessary to cross check with the material test report

Each fitting shall be permanently marked with the required identification by raised lettering and/or stamping. Cylindrical fittings shall be marked on the O.D. or end of the fitting in a location such that the marking will not be obliterated as a result of welding installation (ASME B16.11).

ASME B16.11 covers normal size from 1/8" to 4". Fittings shall be made of materials consisting of forgings, bar, seamless pipe, or seamless tubular products.

There are 6 points that you don’t mistake during inspection, if any missing one of below requirements shall be rejected the material.

  • Name: manufacturer’s name or trade-marks, example I.M.L' logo.
  • Material identification: example ASTM A105N or ASTM A182 F316/316L.
  • Class Designation: example 3000 lbs or 6000 lbs.
  • Product Conformance: B16.
  • Size: (SI or US Customary Units), example NPS 1” or DN25.
  • Heat number or heat code: example T3Z

Equal Tee



Visual inspection and dimensional inspection

Visual inspection: overall check surface condition and marking information.

Dimensional inspection: type of flange and class, material, size, etc. Acceptance criteria refer to ASME B16.11 para 6 and para. 7.

Nguyen Duy Bien

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