Cathodic protection

In accordance with Appendix D to 49 CFR 192, as amended from time to time:#

(1)only depolarized voltages acquired during the previous 5 years may be used to demonstrate a 100-millivolt shift under section I.A.3; and#

(2)determination of the voltage measurement in section II shall be made in accordance with one of the following:#

(A)for impressed current systems:#

(i)interrupting the current and measuring the instant-off potential; or#

(ii)using engineered coupons; or#

(B)for galvanic anode systems, the reading shall be taken as close to the Pipeline as practical. 18#