Pressure Vessel Wall Thickness Calculator | ASME Section VIII Div 1

Pressure Vessel Wall Thickness

Per ASME Section VIII Division 1

UG-27 • UG-32 • UG-99

01 Design Parameters

Design Pressure (P_d) MPa (gauge)

Design Temperature °C

Shell Inner Diameter (D) mm

Shell Length (L_shell) mm (for weight estimate)

Corrosion Allowance (CA) mm

Joint Efficiency (E)

Material

Allowable Stress (S) at Design Temp

138.0 MPa

Per ASME Section II-D

Crown Radius (L) — Torispherical Head mm (default = Shell ID)

02 Shell Thickness — Cylindrical (UG-27)

📐 UG-27(c)(1) — Circumferential Stress t = (P × R) / (S·E − 0.6·P)
where R = D/2 (inside radius)

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Calc. Thickness (mm)

—

Req. Thickness + CA (mm)

—

Specified Std. Plate (mm)

—

Shell MAWP (MPa)

03 Head Thickness (UG-32)

🔵 Ellipsoidal 2:1

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🟠 Torispherical (F&D)

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🟢 Hemispherical

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📐 UG-32(d) — Ellipsoidal Head (2:1) t = (P × D) / (2·S·E − 0.2·P)

📐 UG-32(e) — Torispherical Head (ASME F&D) t = (0.885 × P × L) / (S·E − 0.1·P)
where L = inside crown radius

📐 UG-32(f) — Hemispherical Head t = (P × L) / (2·S·E − 0.2·P)
where L = D/2 (inside radius)

—

Calc. Thickness (mm)

—

Req. Thickness + CA (mm)

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Specified Std. Plate (mm)

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Head MAWP (MPa)

All heads (req. + CA): Ellip: — mm Tori: — mm Hemi: — mm

04 Design Validation & Summary

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Overall Vessel MAWP (MPa) — min(Shell, Head)

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Hydrostatic Test Pressure = 1.3 × MAWP (MPa)

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Design Margin (%)

—

Est. Vessel Weight (kg)

Relative Cost Indicator

Moderate

✓ t_specified ≥ t_required — Checking...

✓ P_test < 1.5·S·E — Checking...

✓ Min. thickness ≥ 1.5 mm (UG-16) — Checking...

✓ Design pressure < MAWP — Checking...

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