How is the scope of application for pressure-resistant cylinders determined?
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Pc≤0.4φ – is this range determined based on the assumptions made when deriving the film theory formula?
Pc≤0.4φ is derived from the membrane strength theory, and this limit corresponds to a ratio of the outer diameter to the inner diameter of the cylinder being less than 1.5. When exceeding this range, the thickness obtained using δ=P ×Di/(2φ-P) deviates significantly from the actual required thickness.
This range of application is derived from film theory