{"operation":"document","citation":"PI-93-053","title":"California Public Utilities Commission — Pipeline Safety Interpretation","source_type":"guidance","agency":"Pipeline and Hazardous Materials Safety Administration","status":"guidance","official":true,"published_on":"1993-08-19","effective_on":null,"summary":"PI-93-053 response to California Public Utilities Commission concerning 192.467.","machine_formats":{"json":"https://regulus.evalyn.ai/document/phmsa-interpretation-pi-93-053.json","markdown":"https://regulus.evalyn.ai/document/phmsa-interpretation-pi-93-053.md"},"app_url":"https://regulus.evalyn.ai/document/phmsa-interpretation-pi-93-053","source_url":"https://www.phmsa.dot.gov/sites/phmsa.dot.gov/files/legacy/interpretations/Interpretation%20Files/Pipeline/1993/PI93053.pdf","body":"<<<PAGE 1>>>\n\nAugust 19, 1993\nMr. Russell W. Copeland\nChief, Utilities Safety Branch\nCalifornia Public Utilities Commission\n505 Van Ness Avenue\nSan Francisco, CA 94102-3298\nDear Mr. Copeland:\nThis responds to your letter of July 16, 1993, concerning the corrosion control\nrequirements in 49 CFR Part 192. Answers to your questions are stated below.\n1. Section 192.467(a) requires each pipeline on which external corrosion control is\nrequired to be electrically isolated from other underground metallic structures,\nunless the pipeline and the other structures are electrically interconnected and\ncathodically protected as a single unit. Under this requirement, the electrical\ninterconnection must be designed and installed as apart of the cathodic protection\nsystem to enable the pipeline and other structures to be cathodically protected\ntogether. Subsequent \"pipe-to-soil\" readings on the other structures indicating\nadequate protection would also indicate the electrical interconnection is\nfunctioning as designed.\n2. Section 192.467(b) requires one or more insulating devices to be installed where\nelectrical isolation of a portion of a pipeline is necessary to facilitate the application\nof corrosion control. Under this section, insulating devices are required only when\nthe portion of pipeline being protected is electrically isolated to achieve the\nrequired level of cathodic protection. If the required protection is achieved\nwithout isolation, no insulating devices are required.\n3. We agree that if a pipeline is not required to have cathodic protection, §192.467(b)\ndoes not require the pipeline to have insulating devices.\nSincerely,\nCesar De Leon\nDirector, Regulatory Programs\nOffice of Pipeline Safety\ndal\\192.467\\93-08-19","truncated":false,"body_characters":1736}