Corrosion under pipe support (CUPS) is a major hidden threat and one of the most aggressive types of corrosion attack on piping systems. CUPS is caused by several factors. Traditionally, the design of pipe supports allows for crevices to be formed which can lead to crevice corrosion in the presence of moisture. Protective coating damages, metal to metal contact and galvanic corrosion also lead to CUPS. The most common causes of external piping failure in ageing assets are due to highly localised deterioration by corrosion in areas which are less accessible and difficult to inspect and repair. As a result, operators may face huge pipe replacement costs, loss of pressure containment and production or in some cases, explosion and massive economic consequences.