{"operation":"document","citation":"PI-81-011","title":"Northwest Pipeline Corporation — Pipeline Safety Interpretation","source_type":"guidance","agency":"Pipeline and Hazardous Materials Safety Administration","status":"guidance","official":true,"published_on":"1981-05-29","effective_on":null,"summary":"PI-81-011 response to Northwest Pipeline Corporation concerning 192.463.","machine_formats":{"json":"https://regulus.evalyn.ai/document/phmsa-interpretation-pi-81-011.json","markdown":"https://regulus.evalyn.ai/document/phmsa-interpretation-pi-81-011.md"},"app_url":"https://regulus.evalyn.ai/document/phmsa-interpretation-pi-81-011","source_url":"https://www.phmsa.dot.gov/sites/phmsa.dot.gov/files/legacy/interpretations/Interpretation%20Files/Pipeline/1981/PI81011.pdf","body":"<<<PAGE 1>>>\n\nMay 29, 1981\nMr. Lloyd A. Hightower\nDirector, Operations\nNorthwest Pipeline Corporation\nP.O. Box 1526\nSalt Lake City, Utah 84110\nDear Mr. Hightower:\nYour letter of May 1, 1981, requests our approval of an aerial survey technique that has been\ndeveloped to monitor the level of cathodic protection on a buried pipeline.\nWe understand the technique would be used to comply with 49 CFR 192.465(a), which requires\nthat cathodically protected pipelines be tested annually to determine if protection is at the levels\nrequired by §192.463 and Appendix D to Part 192. These regulations do not require the use of\nspecific testing methods, and any technique may be used that accurately shows the cathodic\nprotection levels.\nThis office does not recommend one test method over another, and our approval is not needed for\nan operator to use a new method.\nSincerely,\nMelvin A. Judah\nActing Associate Director for\nPipeline Safety Regulation\nMaterials Transportation Bureau\ndal\\192\\463\\81-05-29","truncated":false,"body_characters":993}