The thin-walled pressure vessel formulas would be less accurate for thick-walled vessels.
A thin walled pressure vessel would be considered if the thickness of the vessel is less than 1/20 of its radius.
The ratio between the mean radius of the vessel and the thickness of the wall determines thick wall pressure vessels. For ratio less than 10, it is considered thick wall pressure vessel and for ratio more than 10, it is thin wall pressure vessel.
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