7 Del. Admin. Code § 1352-B-5.0

Current through Register Vol. 28, No. 7, January 1, 2025

Section 1352-B-5.0 - Design and Installation Requirements for Cathodic Protection Systems for ASTs

5.1 General Requirements for Design and Installation of Cathodic Protection Systems for AST

5.1.1 All New metallic ASTs including double bottom ASTs installed on foundations consisting of sand, soil or other material that can allow moisture penetration and corrosion, shall install a Cathodic Protection System to mitigate external corrosion of the tank bottom.

5.1.2 A Cathodic Protection System for the external bottom of a New or Existing metallic AST shall be designed, installed, inspected and maintained to meet or exceed the requirements of the most recent edition of the following industry standards, as applicable:

5.1.2.1 NACE Standard SP0193 External Cathodic Protection of On-Grade Carbon Steel Storage Tank Bottoms;

5.1.2.2 API Recommended Practice 651 - Cathodic Protection of Aboveground Petroleum Storage Tanks;

5.1.2.3 NACE Standard SP0169 - Control of External Corrosion on Underground or Submerged Metallic Piping Systems

5.2 Required Qualifications of Personnel Designing Cathodic Protection Systems

5.2.1 Cathodic Protection Systems shall be designed by individuals who have obtained a NACE Cathodic Protection Specialist Certification and have relevant work experience in the design of Cathodic Protection Systems for ASTs.

5.3 Design and Installation Requirements for Cathodic Protection Systems

5.3.1 Cathodic Protection Systems shall be installed at the time of installation or upgrade of a metallic AST and shall be operational at the completion of the new installation or upgrade, or other schedule as approved by the Department.

5.3.2 Each Cathodic Protection System shall be designed and installed with test stations or other methods to enable the Owner or Operator to monitor the operation of the Cathodic Protection System.

5.3.3 Consideration for monitoring the cathodic protection status of the underside of the AST bottom shall be provided for in the design.

5.3.4 Cathodic Protection Systems shall be designed to provide corrosion protection for the expected active life of the AST or have provisions to allow for the periodic rehabilitation of the Cathodic Protection System.

5.3.5 Measurements of AST to soil potential shall be made no sooner than 60 days and no later than 180 days after installation of the Cathodic Protection System in accordance with the requirements of PART C, Section 5.0.

5.4 Cathodic Protection Criteria

5.4.1 The criteria for determining the effectiveness of cathodic protection shall be as indicated in NACE SP0193.

7 Del. Admin. Code § 1352-B-5.0

20 DE Reg. 815 (4/1/2017)
27 DE Reg. 536 (1/1/2024) (Final)