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