Pressure Vessel Design Calculator

Back to Library

Pressure Vessel Design Calculator

Minimum shell thickness from circumferential (hoop) stress

Design Data

Design Pressure (P)

MPa

Inside Diameter (D)

Inside radius R = 600 mm

Allowable Stress (S)

MPa

SA-516 Gr.70 @

Joint Efficiency (E)

Corrosion Allowance (c)

Section View

Results

Required Thickness (incl. corrosion)

9.34 mm

Pressure-only t = 6.34 mm + c

Recommended Plate

10.00 mm

next standard plate

Hoop Stress @ plate

85.7 MPa

σ_long = 42.9 MPa

Stress Utilisation

90.0 %

of S·E at plate thickness

Thin-wall Limit

36.65 MPa

0.385·S·E (max P)

All Components at this Design Data

Component	Required (mm)	Plate (mm)
Cylindrical Shell	9.34	10
Hemispherical Head	6.15	8
2:1 Ellipsoidal Head	9.31	10

Engineering Tips

Minimum shell thickness from circumferential (hoop) stress per ASME Sec VIII Div 1, UG-27(c)(1). The shell and hemispherical head use the inside radius R; the 2:1 ellipsoidal head uses the inside diameter D.

t = P·R / (S·E − 0.6·P) + c

Read S at the design temperature — it drops as temperature rises (ASME Sec II Part D).
Add the corrosion allowance c, then round up to a standard plate.
Thin-wall formulas hold while P ≤ 0.385·S·E.
Hemispherical heads are thinnest but 2:1 ellipsoidal heads are easier to fabricate.

For guidance only — confirm every design against the current ASME Boiler & Pressure Vessel Code, Section VIII, Division 1.