The paper reports on a series of Joint Industry Projects and field trials to develop a bonded patch repair method for metallic load bearing structures on FPSOs. This cold repair method replaces hot-work, thus avoiding any interruptions of production. Examples of successful use of bonded patch repair are shown. This experience and the JIP project results have been summarised in a DNV Recommended Practice (RP) on bonded patch repair. The RP provides guidance for cold repair of non-critical defects and installation of secondary structures. It covers criticality assessment of defect, design of patch, qualification of materials and patch, fabrication on location and inspection. Furthermore, a method has been developed to predict the capacity of bonded patches. The test results agree well with the numerical predictions.
展开▼
