FRI is currently in the process of replacing the insulation at the unit. During the 2016 turnaround, we replaced the majority of the insulation on the ground level and first deck. Once the insulation was removed, there were several spots that displayed evidence of corrosion under insulation, or CUI, which resulted in several piping projects at the unit.
Over the next several years, we will work our way up to the top of the unit replacing the insulation and looking for more locations affected by CUI.
There is a Process Safety Beacon published by AIChE that provides tips on how to detect CUI.
Click here to read the full Process Safety Beacon.