How do we calculate?
Wall thickness for pressure t = P × D ÷ (2 × σ × e) + c (Barlow). σ is the allowable stress (yield × ratio), e the weld efficiency, c the corrosion allowance. The minimum thickness for handling and installation is taken as (D + 508) ÷ 400 mm. The larger of the two is rounded up to a standard plate thickness.
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