. 2023 Dec 19;16(1):2. doi: 10.3390/polym16010002

Table 14.

The calculation expressions for wall thickness, according to [106,107].

$t = \frac{P \cdot D_{i}}{\frac{2 {\cdot S}_{h}}{F}}$	$t = \frac{P {\cdot D}_{i}}{2 \cdot (0.001 \cdot E_{h})}$
Contact molded(laminated)	Filament wound

t—total wall thickness; P—total internal pressure; D_i—inside diameter; S_h—ultimate hoop tensile strength (since this equation is for contact molded construction, this property is obtained from a flat plate test according to [107]); F—design factor = 10.0; E_h—hoop tensile modulus.