Spring 2019
43 4
T
he onset of corrosion under insulation (CUI)
poses an unseen, costly and
difficult-to-manage threat for every terminal
operator, and every petroleum, gas and
petrochemical supply chain. CUI occurs when moisture
becomes trapped between insulating materials and the
pipework, ductwork, valves or other key external
equipment vital to the operation of storage tanks and
refining assets.
This moisture can be external water, which seeps
through leaking and poorly maintained joints in the
Simon Daly, Hempel A/S, UK, outlines the importance of
immunising against the threat of corrosion under insulation.
