Company name: Withheld
Project: Fuel Oil Tank Roof
Structure dimensions:120' diameter x 40' height (12,100 ft²)
Substrate: Carbon Steel
Contents: Fuel Oil, API Gravity 11.0
Coating used: Mascoat Industrial-DTI (80 mils)
Reason for application: Personnel protection and energy retention
A refinery on the United States West Coast had coated a fuel oil storage tank roof, in late 2007, with 80 mils Mascoat Industrial-DTI (DTI). Pleased with the outcome, it was decided to move forward with an application on an adjacent tank roof in the plant. The adjacent tank roof was stripped of insulation in preparation for the DTI application. Inspection of the tank revealed the substrate was in such poor condition that it was beyond repair, unsafe to be walked upon and fabrication of a new roof would be in order. The second tank, previously insulated with 2” FG and metal jacketing, did not make it to the 10-year lifespan as planned, ~7 years before the CUI had destroyed the integrity of the substrate. Ultimately, when the second tank comes out of service, the tank roof will be coated with insulation coating to prevent a future CUI scenario. The client looks forward to increased energy efficiency with insulation system unaffected by moisture, personnel protection that can even be walked upon, easy visual inspection and elimination of costly CUI.
1st Tank roof: DTI dark Grey used to designate walkway
1st Tank roof, full view: coated with Mascoat Industrial-DTI
2nd Tank Roof View, Corrosion Under Insulation (CUI). Easy to see why clients are so interested in the concept of the MI-DTI coating as it eliminates the CUI issues so apparent and costly here
2nd Tank Full View: Roof to be replaced and coated with Mascoat Industrial-DTI to prevent CUI damage. Improving not only energy efficiency and PP but also inspectability, maintainability, the reliability of structure for the long term.