Collapse depth - definition of collapse depth by The Free Dictionary
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The design depth, referenced to the axis of the pressure hull, beyond which the hull structure or hull penetrations are presumed to suffer catastrophic failure to the point of total collapse.
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The effect of pipe out-of-roundness on collapse depth proposed by Langner and Murphy is given by:
P'c = Pc / (1 + 40 w) (2a) where P'c = corrected collapse depth and P'c = collapse depth for round pipe