Standard markings shall be marked as required in MSS SP-25, except as noted in para. 4.2 of ASME B16.9.

Identification Markings (compulsory)

  • Name. The manufacturer’s name or trademark,
  • Material. Material specification,
  • Rating Designation. (i.e., 150, 300, 400, 600, 900, 1500, or 2500).
  • Conformance. The designation B16 or B16.5
  • Size. The NPS designation shall be marked on flanges and flanged fittings.
  • Ring Joint Flanges. The edge (periphery) of each ring joint flange shall be marked with the letter R and the corresponding ring groove number.

Identification Markings (optional)

  • Multiple Material Marking. Material for components that meet the requirements for more than one specification or grade.

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