S.D. Admin. R. 74:56:03:14

Current through Register Vol. 51, page 71, January 6, 2025

Section 74:56:03:14 - Operation and maintenance of cathodic protection

All owners or operators of metal AST systems with cathodic protection must comply with the following requirements:

(1) All cathodic protection systems must be maintained to provide continuous cathodic protection to the metal components of the AST system in contact with the ground or an electrolyte;

(2) All AST systems equipped with cathodic protection systems must be inspected according to the following minimum inspection schedule:

(a) The cathodic protection system shall be checked within six months of installation for adequate protection and annually thereafter by a corrosion protection tester;

(b) All AST systems with impressed current or sacrificial anodes shall be inspected every 30 days to ensure continuous operation of the rectifier or anodes; and

(c) All results must be maintained for the life of the AST system;

(3) One or both of the following criteria shall be followed when taking tests of AST systems:

(a) A negative potential of at least 0.85 volts measured between an AST system and a saturated copper sulphate (Cu₂SO₄) reference electrode touching the soil above the piping and at a distance of one foot from the tank; or

(b) A negative polarization potential shift of at least 100 mV (.10V) as measured between the AST system and the copper sulphate reference electrode contacting the soil. This shift is the polarization decay determined after the protective current is disconnected; and

(4) Voltage measurements other than those across the structure electrolyte boundary shall be considered for valid interpretation of the voltage measurement taken for the criteria in subdivision (3) of this section.

Owners or operators of all new and upgraded AST systems must certify compliance with corrosion protection requirements on the certification of compliance form.

S.D. Admin. R. 74:56:03:14

14 SDR 76, effective 11/29/1987; 18 SDR 62, effective 10/10/1991; transferred from

General Authority: SDCL 34A-2-93, 34A-2-101.

Law Implemented: SDCL 34A-2-98, 34A-2-99.

Certification of compliance, § 74:56:03:03.