La. Stat. tit. 45 § 256
Every common carrier as defined in R.S. 45:251 shall exchange petroleum tonnage with each like common carrier and shall furnish reasonable connections and facilities for the interchange of this tonnage, subject to such reasonable rates and regulations as may be fixed by the commission. And any such common carrier under like rules and regulations shall be required to install and maintain reasonable facilities for the receipt and delivery of petroleum at such points along its lines as may be reasonably necessary for the proper conduct of its business as a common carrier.
No carrier shall be required to receive or transport any petroleum, except such as may be marketable as defined under reasonable rules and regulations to be established by the commission which is required to make reasonable rules for the ascertainment of the amount of water and other foreign matter in oils tendered for transportation and for deduction therefor and for the amount of deduction, if any, to be made for temperature, leakage, seepage, and evaporation; provided that the recital herein of particular powers on the part of the commission shall not be construed to limit the general powers conferred by this Chapter.
La. R.S. § 45:256