UG-27: Thickness of shells under internal pressure
t: minimum required thickness of shell
| E: Joint efficiency | |
| P: Internal design pressure (see UG-21) | |
| R: inside radius of the shell course under consideration | |
| allowable tensile stress for material from Section II part D | |
| casting allowance (see UG-24) | |
| S: maximum allowable stress value (see UG-23 and the stress limitations specified in UG-24) | |
| corrosion allowance (see UG-25) |
cylindrical shells: circumferential stress
 |
= | + corrosion allowance = |
cylindrical shells: longitudinal stress
 |
= | + corrosion allowance = |
spherical shells
 |
= | + corrosion allowance = |