Tennessee Public Service Commission — Pipeline Safety Interpretation

Page 1Mr. John Searcy Tennessee Public Service Commission Engineering Division Cordell Hull Building Nashville, TN 37219 Dear Mr. Searcy: Your letter of January 6, 1975, asks whether 49 CFR 192.611 applies to pipelines operating at any pressure. Although this rule applies to pipelines operating at any pressure, it is only relevant to a pipeline operating at a pressure which produces a hoop stress of more than 40 percent of the pipeline's specified minimum yield strength. Sincerely, /signed/ Joseph C. Caldwell Director Office of Pipeline Safety DB C:\WP51\INTERPRT\192\611\75-01-29 1#

Page 2January 6, 1975 Mr. Joseph C. Caldwell, Director Office of Pipeline Safety Department of Transportation 2100 Second Street, SW Washington, D. C. 20590 Dear Mr. Caldwell: Is 192.611 applicable to pipelines operating at any pressure? Sincerely, John Searcy Engineering Division DB C:\WP51\INTERPRT\192\611\75-01-29 2#