Pressurevessel Engineering

ASME VIII Div 1 Ellipsoidal Head Minimum Thickness for Internal Pressure Calculator

Compute minimum required wall thickness of a 2:1 semi-ellipsoidal head under internal pressure per ASME BPVC Section VIII Division 1, UG-32(e), based on major/minor axis ratio, diameter, and allowable stress.

Runnable This tool can run, but independent engineering verification has not been established.

Quick Answer

Calculate ASME VIII Div 1 Ellipsoidal Head Minimum Thickness for Internal Pressure

Calculator

Minimum Required Wall Thickness (m)
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Result Interpretation

ASME VIII Div 1 Ellipsoidal Head Minimum Thickness for Internal Pressure Calculator computes Minimum Required Wall Thickness in m using the defined engineering formula and the input values provided. Minimum Required Wall Thickness is expressed in m. No universal acceptance threshold is defined by this calculator.

Worked Example

Verified calculation

Given:

  • Internal Design Pressure = 1000000
  • Inside Diameter of Head = 2
  • Maximum Allowable Stress Value = 138000000
  • Weld Joint Efficiency = 1

Expected Result:

  • Minimum Required Wall Thickness = 0.0072516316171139

Engineering Interpretation:

Under the given input conditions, the calculated result is: Minimum Required Wall Thickness = 0.0072516316171139 m.

The actual numerical result is computed by the Runtime engine using the persisted tool definition. The values shown here come from deterministically validated test cases.

Formula / Method

minimum required wall thickness = (internal design pressure * inside diameter of head) / (2 * maximum allowable stress value * weld joint efficiency - 0.2 * internal design pressure)

Formula family: formula_pressurevessel_asme_viii_div_1_ellipsoidal_head_minimum_thickness_for_internal_pressure_calculator

Variables

SymbolLabelRoleDescription
internal_pressure Internal Design Pressure INPUT Internal Design Pressure
inside_diameter Inside Diameter of Head INPUT Inside Diameter of Head
allowable_stress Maximum Allowable Stress Value INPUT Maximum Allowable Stress Value
joint_efficiency Weld Joint Efficiency INPUT Weld Joint Efficiency
wall_thickness Minimum Required Wall Thickness OUTPUT Minimum Required Wall Thickness

Calculation Steps

  1. Enter the internal design pressure in Pa.
  2. Enter the inside diameter of head in m.
  3. Enter the maximum allowable stress value in Pa.
  4. Enter the weld joint efficiency in dimensionless.
  5. Step 1: Compute minimum required wall thickness.
  6. Read the minimum required wall thickness (m) from the results.

Engineering Summary

Calculate ASME VIII Div 1 Ellipsoidal Head Minimum Thickness for Internal Pressure

Frequently Asked Questions

What does this calculator calculate?

The ASME VIII Div 1 Ellipsoidal Head Minimum Thickness for Internal Pressure Calculator estimates Minimum Required Wall Thickness based on the input parameters you provide

Why is internal design pressure important in this calculation?

internal design pressure is used directly in the calculation of minimum required wall thickness. Its effect on the result depends on the complete formula and the values of the other inputs.. When you enter internal design pressure in Pa, the calculator uses it in the engineering formula to compute the output

How should I interpret the result minimum required wall thickness?

The calculator outputs minimum required wall thickness in m. The result is computed directly from the input values using the defined engineering formula

What units should I use for the inputs?

Enter each value in the units shown next to the input field: Internal Design Pressure (Pa), Inside Diameter of Head (m), Maximum Allowable Stress Value (Pa), Weld Joint Efficiency (dimensionless). Make sure all inputs use the specified units for consistent results

What assumptions does this calculator use?

This calculator uses automatically validated engineering formulas. Results are approximate and should be validated against site-specific conditions, applicable codes, and professional engineering judgment

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