# Length $L_e$ for Conical Sections sketch (d) for external pressure

## Values for calculation

## Calculation

### Equivalent length of conical head or Section between lines of support

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$$L_e=r_2\cdot\cfrac{D_{ss}}{D_L}\cdot\sin{α}+\cfrac{L_c}{2}\cdot\left(\cfrac{D_L+D_s}{D_L}\right)$$