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Wall
Thickness Calculation of Hemispherical Head Under Internal Pressure
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ASME
Section VIII Div 1 - UG 32 - Thickness of Formed Head, and Sections, Pressure
on Concave Side
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(Enter values in yellow cells for calculations and
in blue cells as information)
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DATA INPUT
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Design Conditions
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Material
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Design Pressure, Pd =
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barg
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Head
Material Specification
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Head
Material Type
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Design Temperature, Td =
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°C
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Allowable
Stress Head, S =
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MPa
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Joint efficiency, E =
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Dimensions
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Inner
Diameter, Di =
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mm
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Corrosion Allowance, CA =
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mm
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Nominal wall
thickness before forming, tn =
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mm
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Thickness
after forming (1),
tf =
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mm
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Outside
Diameter, Do =
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mm
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Check If tr
≤ tf
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Note:
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(1) As per UG-79
(d)(3) The reduction in weld thickness after forming shall not exceed 1/32
in. (1 mm) or 10% of the nominal thickness of the adjoining surface,
whichever is less.
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CALCULATIONS
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Hemispherical Head
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Thickness after forming adjusted for corrosion, nt =
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mm
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nt = tf-CA
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Inside spherical or crown radius adjusted for corrosion, L =
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mm
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L = Di/2 + CA
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Wall Thickness [ASME UG-32]
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Minimum required thickness, tr =
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mm
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tr =
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P L
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+ CA
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2 S E - 0.2 P
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Check If tr ≤ tf
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Maximum working pressure
[ASME UG-32]
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Maximum working pressure for Hemispherical Head, Pmax =
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barg
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P =
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2 S E nt
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L + 0.2 nt
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Check If Pmax ≥ P
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Check
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Limitations: tr < 0.356L or P < 0.665 SE
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tr < 0.356L
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P < 0.665 SE
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Volume =
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m³
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V =
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(
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π Di³
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/ 10⁹
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12
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Weight =
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Kg
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V =
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((
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π (Do³-Di³)
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/ 10⁹) ρm
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12
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RESULT
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Design Conditions
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Design Pressure, Pd =
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barg
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Design Temperature, Td =
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°C
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Material
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Head Material
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Dimensions
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Outside Diameter, Do =
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mm
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Nominal wall thickness before forming, tn =
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mm
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Thickness after forming, tf =
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mm
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Inner Diameter, Di =
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mm
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Maximum working pressure =
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barg
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Volume =
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m³
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Weight =
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Kg
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