Interpretation Response #PI-92-062
Below is the interpretation response detail and a list of regulations sections applicable to this response.
Interpretation Response Details
November 23, 1992
Mr. Dan H. Weaklend
Chief, Pipeline Safety Utilities Division
Arizona Corporation Commission
1200 W. Washington Street
Phoenix, AZ 85007
Dear Mr. Weaklend:
Thank you for your letter of July 29, 1992, regarding cathodic protection tests. You asked if a pipeline's cathodic protection is acceptable if a test point on the pipeline meets one of the criteria in Appendix D of 49 CFR Part 192 but fails under another of the criteria. The Part 192 standards relevant to your inquiry are §§ 192.463(a) and 192.465(a). Under § 192.463(a), each cathodic protection system on a pipeline must provide a level of protection that complies with one or more of the Appendix D criteria or its equivalent. Section 192.465(a) requires operators to test each pipeline under cathodic protection to determine if § 192.463(a) is met.
As we apply these standards, an operator is in compliance with § 192.463(a) as long as each point tested under § 192.465(a) meets any one of the Appendix D criteria or its equivalent. No further test data are required if one of the criteria is met. In addition, the operator's corrosion control procedures under § 192.453 should, at a minimum, specify the criterion used for each segment of pipeline.
I apologize for the delay in answering your letter. For a prompt reply to any of your concerns, please call Jim Thomas, Director, Southwest Region, at (713) 750-1746.
Cesar De Leon
Director, Regulatory Programs
Office of Pipeline Safety
|§ 192.463||External corrosion control: Cathodic protection|