EXXONMOBIL PIPELINE COMPANY LLC — Integrity Assurance Notification

REPAIRPursuant to §192.933(c), ExxonMobil Pipeline Company (EMPCo) gives notice to the Louisiana Department of Natural Resources Office of Conservation’s Pipeline Division and the Pipeline and Hazardous Materials Safety Administration (PHMSA) of a repair condition that will not be remediated within the repair schedule. High water conditions are impeding completion of the repair. The condition is located on EMPCo’s LA-61 BR CHEM - BRPO Return Ethylene pipeline at the Monte Sano Bayou exposed span crossing in East Baton Rouge Parish. EMPCo’s IMP process schedules metal loss for repair at half-way to the point that it could reach 80% WT, and has identified the anomaly as a One-Year Repair Condition. The anomaly was identified as an External Metal Loss of 55% by the UTWM ILI tool in February 2018. Applying a conservative growth rate of 22.5 mills per year (9% of WT per year), EMPCo believes that the feature could grow to an External Metal Loss of 69% by end of August 2019. B31G calculations at the maximum allowed metal loss depth (with estimated External Metal loss of 79%) indicate P-burst and P-Safe burst pressures of 1,312 psig and 787 psig. The MAOP of the pipeline system is 720 psig, with normal operating pressure of ~300 psig. EMPCo does not intend to apply a temporary pressure reduction.#