Tanker and barge Vessels that transport crude oil or petroleum products. Note: Data are reported for movements between PAD Districts; from a PAD District to the Panama Canal; or from the Panama Canal to a PAD District. TEMA Tubular Exchanger Manufacturers Association (USA). TES - Total Energy System A composite energy system, which generally includes the utilization of waste heat. Refers in essence to the co-generation systems seen today. Toe/Mtoe Tonnes of oil equivalent/Million tonnes of oil equivalent. Toolpusher Drilling supervisor or foreman in charge of the rig. Topsides The top part of a platform positioned on the jacket. Transesterification The chemical process in which an alcohol reacts with the triglycerides in vegetable oil or animal fats, separating the glycerin and producing biodiesel. Transshipment A method of ocean transportation whereby ships off-load their oil cargo to a deepwater terminal, floating storage facility, temporary storage, or to one or more smaller tankers from which or in which the oil is then transported to a market destination. Trunk line A main pipeline.