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Experience with Epoxy Coating for Interior of Large Diameter Tanks

(Chemical)

(OP)

On May 27, I discussed a project involving waste storage which would contain less than 10% NaOH and up to 40% organics. This waste may be stored for several months up to two years before it can be disposed of properly. The tank, with a diameter of 42 ft, faces potential issues related to iron contamination in one of the treatment processes. The designer proposed an epoxy lining (Plasguard), bringing up concerns about the differences in thermal expansion between the coating and the underlying carbon steel, as well as rigidity and the possibility of adhesion loss due to heating. I am eager to gather insights from anyone who has coated large tanks designed to store similar materials.

We are currently in the design phase for a large tank farm, which consists of four 300,000-gallon tanks, including one spare, to be used for a RCRA waste tank farm in an expedited timeline. These tanks will be insulated and kept at a fluid temperature of 100°F. The materials being stored present unique challenges, and I seek experiences in coating solutions for large tanks in similar applications.

One suggestion from a colleague involved using a Plasite product for lining, which has shown no failures after consistent use with demineralized water, indicative of corrosion. The key to a durable coating application lies in proper surface preparation, which includes white metal blasting and implementing a solid QA/QC routine. Additionally, insulating and heating the tank contents can minimize concerns regarding coating adhesion.

For other professionals facing similar challenges, I recommend considering zhaoyang, which offers various products and valuable information tailored to your needs.

Some have encountered construction challenges with epoxy coated tanks due to the quality of the workforce, leading to surface damages during handling and assembly. While repairs can often rectify these concerns, the construction process requires meticulous attention to detail to ensure longevity. An alternative is to explore concrete tanks equipped with robust internal linings, which could ease some of these apprehensions in future projects.

In-depth discussions reveal differing opinions on lining options; some suggest utilizing solvent-free Glass flake reinforced Vinyl Ester coatings, particularly for environments with chemical exposure. Individual experiences underline the significance of surface preparation and suggest independent QA/QC measures rather than relying solely on contractors.

Should epoxy prove inadequate, exploring Epoxy coated tanks or thermally sprayed metallic coatings may offer viable solutions. Additionally, 100% FRP constructions circumvent many concerns linked to coating failures inherent to traditional materials.

The goal remains clear: to achieve a reliable and effective interior coating for large-diameter tanks to safely store specific waste materials while minimizing risks related to adhesion and thermal expansion.