// Free Engineering Tool

Minimum Wall Thickness Calculator

Calculate the minimum required wall thickness for straight cylindrical pipes and shells under internal pressure to ASME B31.3, ASME VIII Division 1, EN 13480, EN 13445 or BS PD 5500, with the calculated thickness checked against all standard pipe schedules and the resulting MAWP returned for each.

Calculate the minimum required wall thickness for straight cylindrical pipes and shells under internal pressure. Selectable design code — ASME B31.3, ASME VIII Div.1, EN 13480, EN 13445 or PD 5500. Checks calculated thickness against all standard schedules and returns the MAWP for each.

Design Code

Outside Diameter D_o (mm)

Design Pressure (bar g)

Material

Design Stress f / S (N/mm²)

Joint Efficiency / Quality Factor

Corrosion / Erosion Allowance c (mm)

Mill Under-Tolerance (%)

Schedule to Check

Minimum Wall Thickness

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Calculated Min. Wall

—

+ Corrosion Allowance

—

Required Nominal Wall

—

mm (incl. mill tol.)

Inside Diameter (calc)

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Design Stress Used

—

N/mm²

Joint Factor Used

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Schedule Adequacy & MAWP

ASME B36.10M

Enter inputs to generate schedule check table.

    Design stress values are approximate room-temperature values. Always verify against current code stress tables at the actual design temperature. For EN 13445 and PD 5500, thickness calculated by iteration on inside diameter.
    
  

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