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A remarkable amount of financial loss is incurred every year because of premature failures of paints and coatings. The budget to repair such failures extremely outweighs the initial cost of coatings, since excessive engineering may be looked-for to access the deteriorating areas of a coating system. Additional accountability may also be anticipated if a facility stops operation for the essential repairs to be made.
Protective coatings are used to protect the metal surfaces to hinder their direct interaction with service fluids. In this case study, a broad investigation was performed to determine the reason behind the failure of the FRE (fiber-reinforced epoxy) lining of a condensate storage tank located in the Arabian Gulf region. Visual inspections revealed various coating defects, including checking and crazing marks. Pull-off testing revealed that two out of six readings were not meeting the specifications for adhesion compliance. DFT (dry film thickness) checks revealed several locations, which were either undercoated or over coated beyond the specified limits. SEM (scanning electron microscope) analysis alongside the cross-sectionsrevealed inter-layers delamination. In addition, the primer layer was visible from the surface, which implies the degradation of intermediate and topcoats. Finally, rust stains were visible at certain locations. FTIR (Fourier transform infrared) spectrum of the applied lining system indicated that it bears resemblance with phenoxy resin, which was in fact, incompatible with the condensate service. The failure mechanism leading to the failure of the applied lining is analyzed and discussed in this paper.
What is the cost of Tank Linings? Are we able to answer this properly, do we take into account all the factors, and do we see the main cost driver? It is a well known fact that time is money, and if we take into account the cost of being out of service or a delay in beginning operations then the cost of time is far greater than individual costs of producing equipment and coating them.
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The above ground storage tanks in the refinery are experiencing bottom plate underside (soil) corrosion at a high rate of 1mm/year. Results: Failure of 4 tanks within a period of 9 years. Observations, details of the CP survey, tests, results and forward path taken up.