020-17 Wyo. Code R. § 17-11

Current through April 27, 2019

Section 17-11 - Operation and Maintenance of Corrosion Protection (CP)

All owners and/or operators of steel storage tank systems with CP shall comply with the following requirements to ensure that releases due to corrosion are prevented for as long as the storage tank system is used to store regulated substances:

(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 steel tanks or connected piping exist on that site. This does not preclude replacement of parts of the CP system which 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 six (6) months of installation and at least once every three (3) years thereafter.

• (ii) The criteria that are used to determine that CP is adequate shall be in accordance with the NACE Standard RP0285-2002, "Control of External Corrosion on Metallic Buried, Partially Buried, or Submerged Liquid Storage Systems."

• (iii) All CP systems shall be tested within six 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 RP0285-2002.

(c) Impressed Current Systems. Storage tank systems with impressed current CP systems shall also be inspected by the owner and/or operator every sixty (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. For storage tank systems using CP, records of the operation of the CP system 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 (2) CP inspections required in accordance with paragraph (b) of this section; and

• (ii) The results of the last three (3) CP inspections required in accordance with paragraph (c) of this section.

020-17 Wyo. Code R. § 17-11