Calculateur de Puissance de Compresseur — Formule

Pipe Wall Thickness Design

The required pipe wall thickness depends on the internal pressure, pipe diameter, material allowable stress, and safety factors. The Barlow formula provides the starting point.

Barlow Formula

t = P × D / (2 × S × E)

The ASME B31.3 modified version: t = P × D / (2 × (S × E + P)) + CA

where P is pressure, D is outside diameter, S is allowable stress, E is weld joint efficiency, and CA is corrosion allowance.

Exemple Résolu

A 6" Sch pipe (OD=168.3 mm) at 10 MPa, S=137.9 MPa, E=1.0, CA=1.5 mm.

  1. Barlow: t = 10 × 168.3 / (2 × 137.9 × 1.0) = 1683 / 275.8 = 6.10 mm
  2. ASME modified: t = 10 × 168.3 / (2 × (137.9 + 10)) + 1.5
  3. t = 1683 / 295.8 + 1.5 = 5.69 + 1.5 = 7.19 mm