[DOCKET NO. PHMSA-2016-0071]
The Department of Transportation/Pipeline Hazardous Materials Safety Administration (PHMSA) issued an Advisory Bulletin (ADB–2016–04) to remind all owners and operators of hazardous liquid, carbon dioxide, and gas pipelines of the need to ensure that pipelines that are both buried and insulated have effective coating and corrosion-control systems to protect against cathodic protection (CP) shielding. Owners and operators were also reminded to conduct in-line inspections for all threats, and to ensure that in-line inspection findings are accurate and verified.
Corrosion under insulation (CUI) is recognized as an integrity threat that is difficult to address through conventional CP systems. This Advisory Bulletin references NACE International publication 10A392, 2006 Edition, “Effectiveness of Cathodic Protection on Thermally Insulated Underground Metallic Structures,” as a guide for external corrosion control of thermally-insulated underground steel pipe. Owners and operators need to review their operating, maintenance, and integrity management activities to ensure that CUI is adequately addressed and to ensure the safety of the public and operating personnel and to protect the environment.
For a copy of ADB-2016-04 with the full list of recommendations and action items, contact Jessica Foley.