ENABLE GAS GATHERING, LLC — Integrity Assurance Notification

NON-STEEL LIQUID PIPEIn compliance with 49 C.F.R. 195.8, Enable Gas Gathering, LLC (EGG or Company) submits this notification to the Pipeline and Hazardous Materials Safety Administration (PHMSA) and the Oklahoma Corporation Commission (OCC) and of its intent to install HDPE pipe in crude oil transmission service. To maintain safe and reliable pipeline service to certain crude oil producers in the State of Oklahoma and to fully mitigate the risk of internal corrosion from the existing subject steel pipeline system, the Company intends to replace service of the V-6 12-inch steel pipeline (Tuttle to Naples) located in Grady County, OK with 8-inch diameter HDPE pipe. The Company has implemented proactive measures on the existing steel pipeline such as treatment with corrosion inhibitor and biocide, maintenance (cleaning) pigging and in-line inspections with tools capable of detecting both internal and external metal loss. Despite these measures, the V-6 12-inch pipeline is at increased risk of failure due to internal corrosion primarily caused by its operational characteristics (intermittent and non-turbulent flow). In light of this circumstance and after careful analysis, the Company is confident the safer and more reliable alternative to continuing to transport crude oil via this pipeline is to place a smaller diameter (8-inch HDPE pipeline) in service utilizing the existing 12-inch steel pipeline as a conduit.#