Overview and scope
B1 calculates required wall thicknesses and allowable pressures for thin-walled cylindrical and spherical shells under internal pressure. Confirm the applicable code edition and scope before use.
Calculation objective
The module evaluates operating and test cases from geometry, pressure, material strength, safety factors, weld factor and allowances. The larger required thickness governs. For an executed wall thickness it also calculates allowable pressures and geometric values.
Cylindrical shell
Design type 1. Length V10 is required for volume and weight values.
Spherical shell
Design type 2. Cylinder length is not required.
Boundaries
- Use B10 for thick-walled cylinders outside the B1 scope.
- Opening reinforcement verification belongs to B9.
- External-pressure buckling is not covered.
Key results
| Value | Variable | Interpretation |
|---|---|---|
| Governing required wall thickness | V1 | compare with executed V9 |
| Allowable operating pressure | V36 | for the executed thickness |
| Allowable test pressure | V37 | for the executed thickness in the test case |
This operational guide does not replace checking the applicable standard and project-specific engineering conditions.