For case studies 1 carry out an assessment of all hands-on case studies and produce an assessment
– a description of the structural system explaining purpose and function.
– a condition report covering the current state of the structure and fitness-for-purpose
– likely consequences of a failure
– highlight safety critical features requiring focussed structural integrity analysis
– a proposal for the non-destructive inspection (NDI) stating the features to be considered, type of defect that may be present and NDI techniques to be deployed. Remember that cost, access, time and operator safety are factors in deciding which NDI methods to propose (photos, diagrams and sketches may be used).
– use failure analysis techniques as appropriate, to determine if the system is safe to operate and an expected life of operation.
– justify decisions showing clearly your structural integrity calculations (e.g., FAD analysis).
– suggest remedial actions to mitigate the effects of each defect
This example of an early autoclave was comprises an inner pressure vessel and outer water cooling jacket.
A crack has been detected in the inner pressure vessel casing in the longitudinal direction. Currently, this appears to be a surface crack with a depth of 50% of the inner wall thickness and 100mm long.
Question: Determine a safe working internal pressure that can be used to ensure that this crack does not propagate and cause a complete failure of the inner vessel. Determine a safe working pressure to allow at least 10,000 pressure cycles before the crack becomes critical.
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