AST Protection for Internal Roof Surface and Support Structures

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Industry Problem:

Certain grades of oil that contain sulphur emit corrosive, sour gas vapors that destroy the internal surfaces of Aboveground Storage Tank (AST) roofs and their support structures above the product layer. Aggressive pitting and crevice corrosion create holes in the tank tops that cause unsafe operating conditions and environmental problems. Internal tank coatings decrease surface corrosion but have proven to be ineffective in preventing dangerous pitting and crevice corrosion – especially in the interstitial spaces between the roof and support structures.

Our Solution:

NTIC has developed the Zerust® ReCAST-R solution to protect the interior surface of AST roofs, consisting of dispensers that deliver the proprietary inhibitor formulations into the vapor space between the surface of the product and tank roof. The Zerust® inhibitor forms a protective layer that prevents corrosion in highly-aggressive environment (H2S, SO2, etc.).  Zerust® ReCAST-R solution can be implemented to extend the service life of a single tank roof to 25 years and beyond.  Each system is tailored to client’s requirements, depending on specific environmental conditions, product stored, tank diameter, and type of metal, and can be applied on both new and existing roofs.
 

Below are photos of the Zerust® ReCAST-R dispensers, installed atop a 25-meter diameter aboveground storage tank:

The Zerust® ReCAST-R system has been successfully deployed in aggressive internal corrosion environments as illustrated by the key parameters below:

 
Actual pitting corrosion pictures taken at a client’s site: