ExxonMobil has filed a tariff complaint with US regulators against the Locap crude pipeline in Louisiana which it alleges delivered zinc-contaminated crude in June and July.
In its complaint with the Federal Energy Regulatory Commission (FERC), ExxonMobil alleges that operators of the Locap pipeline, which moves crude, including Mars, from the Clovelly storage hub in Louisiana to onshore systems and refineries, were slow to respond to complaints about the crude quality issues.
ExxonMobil warned suppliers in July of "serious quality issues" related to elevated levels of zinc in Mars crude, according to market sources. In letters to suppliers ExxonMobil said the crude quality issues were "... significantly affecting the operations" at its 522,500 b/d Baton Rouge refinery and that it would stop accepting Mars crude "... in an effort to avoid further damages."
In the FERC filing ExxonMobil said Locap should have refused to accept tenders of crude that failed to comply with "merchantability requirements" outlined in its tariff, and alleged that "Locap did nothing for weeks to either exclude the contaminated product from entry into the pipeline system or determine where the problem originated."
ExxonMobil said it suffered economic harm because it was required to obtain crude from different sources — including from the US Strategic Petroleum Reserve — and may suffer additional commercial harm if its trading partners attempt to recoup losses and damages related to crude sales contaminated with zinc.
Locap, owned by Shell pipeline and MPLX, is part of the Louisiana Offshore Oil Port system which connects to the Mars crude pipeline system. Shell declined comment on the FERC complaint, while MPLX did not immediately return a request for comment.
Chevron said on 11 July that it identified a potential source of the Mars crude contamination which it associated with the start-up of a new well from one of its deepwater Gulf operations. The issue involving the zinc levels was resolved later in July.
In the complaint ExxonMobil said it wants FERC to direct Locap to follow its tariff and ensure connecting carriers ship only on-spec crude.

