www.sonomatic.com Case Study 06 August 2010 Design Project Project: TOFD for sizing remaining wall under External Blisters prior to Fabric Maintenance Problem: External blisters were identified during a visual inspection of process pipe work on board a North Sea platform. Fabric maintenance is required to rectify these defects, however, until the thickness of remaining steel under blisters is confirmed, there is a potential that any remedial work to the external surface could cause leakage or failure of the pipe section. Benefits: Major benefits of this technique are: • Non Intrusive Method of Defect Sizing • No need to shut down - Inspection can be carried out on a live line • Low risk of further damage to defect area • Accurate Sizing of Defec

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