020-1 Wyo. Code R. § 1-11

Current through April 27, 2019

Section 1-11 - Operation and Maintenance of Cathodic Protection (CP) Systems

All owners and/or operators of metal storage tank systems with CP shall comply with the following requirements to ensure that releases due to corrosion are prevented until the storage tank system is permanently closed or undergoes a change-in-service pursuant to Part G:

(a) Continuous Operation. All CP systems shall be operated and maintained to continuously provide corrosion protection to the metal components of that portion of the tank and piping that routinely contain regulated substances and are in contact with the ground. Once installed, CP systems shall not be removed, even if the tank has also been internally lined, as long as metal tanks or connected piping exist on that site. This does not prevent replacing parts of the CP system that have become defective.

(b) Periodic Inspections. All storage tank systems equipped with CP systems shall be inspected for proper operation by a qualified CP tester in accordance with the following requirements:

• (i) All CP systems shall be tested within 6 months of installation and at least once every 3 years thereafter.

• (ii) The criteria that are used to determine that CP is adequate shall be in accordance with:
  • (A) NACE International Test Method TM0101, as referenced in Section 2;
  • (B) NACE International Test Method TM0497, as referenced in Section 2;
  • (C) NACE International Standard Practice SP0285, as referenced in Section 2;
  • (D) NACE International Standard Practice SP0169, as referenced in Section 2; or
  • (E) STI Recommended Practice R051, as referenced in Section 2.

• (iii) All CP systems shall be tested within 6 months of any repair or substantial modification to the storage tank system, or any other installation on the facility requiring excavation, in accordance with NACE Standard SP0285, as referenced in Section 2.

(c) Impressed Current Systems. Storage tank systems with impressed current CP systems shall also be inspected by the owner and/or operator every 60 days to ensure the equipment is running properly. The owner and/or operator shall make a record of these inspections, including the date of the inspection, the voltage reading on the rectifier, the amperage reading on the rectifier, and the hour reading on a properly connected hour meter showing how long the system has operated since the last inspection. The owner and/or operator shall compare those readings to the readings determined to be correct during the last inspection required under paragraph (b) of this Section. Large changes in the voltage or amperage readings, or zero readings, shall be investigated by the owner and/or operator.

(d) Records. CP system operation records shall be maintained in accordance with Section 13(c) to demonstrate compliance with the performance standards in this Section. These records shall provide the following:

• (i) The results of testing from the last two CP system inspections required in accordance with paragraph (b) of this Section; and (if applicable)

• (ii) The results of the last three CP system inspections required in accordance with paragraph (c) of this Section.

(e) CP System Repairs. In the event a CP system fails testing, the owner and/or operator shall have a CP expert evaluate and design necessary repairs within 30 days of failure and have the repairs completed within 90 days of failure. All repairs shall be made in accordance with one or more of the following standards or practices:

• (i) STI-P3® Specification and Manual for External Corrosion Protection of Underground Steel Storage Tanks, as referenced in Section 2; or

• (ii) UL Standard 1746, as referenced in Section 2; or

• (iii) NACE Standard SP0285, as referenced in Section 2.

(f) Stake-Type Sacrificial Anodes. Stake-type sacrificial anodes connected to piping flex connectors may be replaced by a licensed CP tester without the repairs being designed by a CP expert.

020-1 Wyo. Code R. § 1-11

Adopted, Eff. 6/29/2018.