Current through Register Vol. 48, No. 50, June 10, 2024
Part 7151.5600 - CORROSION PROTECTIONSubpart 1.Tanks.The floor of a steel aboveground storage tank must be protected from corrosion using one of the following methods:
A. the tank is elevated so that the underside of the tank floor is not in contact with any surface other than the tank supports;B. the tank rests on a continuous concrete slab that is designed to prevent water from accumulating under the tank floor;C. the tank is double walled;D. the tank is double-bottomed with: (1) a vacuum pulled on the interstitial space; or(2) a cathodic protection system installed in the interstitial space;E. the tank floor is: (1) cathodically protected; and(2) internally lined in accordance with American Petroleum Institute Standard 652;F. the tank floor is: (1) cathodically protected; and(2) internally inspected in accordance with American Petroleum Institute Standard 653; orG. the tank floor is: (1) internally lined in accordance with American Petroleum Institute Standard 652; and(2) internally inspected in accordance with American Petroleum Institute Standard 653.Subp. 2.Lines.A steel line must be protected from external corrosion using one of the following methods:
A. the line is not in contact with soil;B. the line is cathodically protected; orC. the line is double walled.Subp. 3.Design criteria.Cathodic protection of new steel tanks and lines must meet the following design criteria:
A. the cathodic protection system must be designed by a corrosion expert in accordance with American Petroleum Institute Standards 651 and 1632, as applicable; andB. underground lines and the underside of the floor of a shop-fabricated steel tank must be coated with dielectric material in accordance with Steel Tank Institute Recommended Practice R893-89.Statutory Authority: MS s 115.03