mplx lp owns and operates midstream energy infrastructure and logistics assets primarily in the united states. it operates in two segments, logistics and storage, and gathering and processing. the company is involved in the gathering, processing, and transportation of natural gas; gathering, transportation, fractionation, exchange, storage, and marketing of natural gas liquids; transportation, storage, distribution, and marketing of crude oil and refined petroleum products, as well as other hydrocarbon-based products, such as asphalt; and sale of residue gas and condensate. its pipeline network includes 13,000 miles of pipeline throughout the united states; storage caverns consist of butane, propane, and liquefied petroleum gas storage with a combined capacity of 4.7 million barrels located in neal in west virginia, woodhaven in michigan, robinson in illinois, and jal in new mexico, as well as marine business owns and operates 23 boats, 286 barges, and third-party chartered equipment,