Abstract
The structural integrity diagram, a plot of crack depth against crack length, can be used to investigate a wide range of safety arguments for flawed pressure vessels, including Leak-Before-Break. It enables clear margins to be shown for defects which might exist in the vessels and indicates crack sizes and loadings where the Leak-Before-Break case is valid. The use of this diagram requires a model of crack shape development as a crack grows through the wall of the vessel up to the stage at which the deepest part of the crack breaks through the wall, and this is considered for a number of growth mechanisms. Uncertainties exist, however, in the understanding of crack behaviour relevant to this issue. These uncertainties are reviewed and work programmes underway in the UK aimed at resolving some of them are outlined.
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