CORROSION UNDER INSULATION (CUI) is a difficult damage mechanism to detect because the insulation masks the problem until it is too late. CUI is a real threat to the reliability of many processing plants and facilities. CUI can cause failures in parts of the plant that are not normally considered for inspection. The failures are often the result of localised corrosion and not general wasting over a large area, making it very difficult to develop a cost-effective inspection program to effectively cover many hundreds of thousands of kilometres of insulated piping across different industries. Failures from CUI can be catastrophic or at least have a significant safety and economic effect on the plant, mainly due to lengthy downtime and repairs following an unexpected failure. CUI is difficult to detect because it is hidden by the insulation masking the corrosion until it is too late. Removal of the insulation is expensive and time consuming, so an inspection solution is required. There are a number of methods currently used to inspect for corrosion under insulation, but unfortunately there is no ?silver bullet?. It is therefore important to develop a reliable screening strategy that can cover a large snapshot of the plant and that delivers ?best practice? inspection. The strategy should be structured, robust and appropriate for inspecting pipe work and other components to detect CUI. Developing and applying a rapid and effective screen strategy is far better than doing nothing.