Corrosion Under Pipe Support 

CUPSCorrosion Under Pipe Support occurs due to the contact between a pipe and its support. In certain designs of support, water can ingress between the pipe and the support, resulting in corrosion and the formation of pits. Any movement of the pipe relative to the support through vibration or expansion can lead to the damage of any protective coating on the pipe, allowing corrosion to form. There can also be metallurgical differences between the pipe and the support, leading to a small potential difference and the formation of a corrosion cell. As described by the name, this is a highly localised corrosion.

For more information on corrosion under pipe support and measurement of remaining pipe thickness, see:
T Pialucha et al, ‘Quantitative measurement of remnant thickness in corrosion under pipe supports’, Insight: Non-Destructive Testing and Condition Monitoring, Vol 62, No 11, pp 642-648, November 2020.

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