Calculation Methods for the Pressure Rating of Seamless Steel Pipes

I. Calculation method for determining the pressure rating of a seamless steel pipe based on its outer diameter and wall thickness (Note: Tensile strength varies by steel grade)

Pressure = (Wall thickness × 2 × Tensile strength of steel grade) / (Outer diameter × Coefficient)

II. Calculation method for determining the wall thickness of a seamless steel pipe based on its outer diameter and required pressure rating:

Wall Thickness = (Pressure × Outer Diameter × Coefficient) / (2 × Tensile Strength of Pipe Material)

III: Methods for Expressing Pipe Pressure Coefficients:

Pressure P < 7 MPa: Coefficient S = 8

7 < Pressure P < 17.5 MPa: Coefficient S = 6

Pressure P > 17.5 MPa: Coefficient S = 4