Pressure Design Thickness

Minimum allowed pipe wall thickness needed to hold the design pressure at the design temperature.

  • NOTE: 1 Pressure design thickness is determined using the rating code formula, including needed reinforcement thickness.
  • NOTE: 2 Pressure design thickness does not include thickness for structural loads, corrosion allowance, or mill tolerances and therefore should not be used as the sole determinant of structural integrity for typical process piping (e.g. 7.3).

Source: API 570, Piping Inspection Code: In-service Inspection, Rating, Repair, and Alteration of Piping Systems, Fourth Edition, February 2016, with Addendum May 2017. Global Standards

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