Common use of Deisobutanizer Unit Clause in Contracts

Deisobutanizer Unit. The deisobutanizer (DIB) unit is used to manufacture isobutane and normal butane from mixed butane streams. The Butane mixtures arrive at the Mont Belvieu Complex via pipeline and enter the DIB unit from the butamer units, or from the Mont Belvieu Complex storage facility, as commercial butane mixtures. The mixed butanes are routed to the deisobutanzier distillation column, where the manufacturing of isobutane and normal butane occurs. The overhead vapor stream from the column is isobutane, which is compressed into liquid phase isobutane. The liquefied isobutane product is split into two streams, one providing reflux for the column, and the remaining stream sent to the storage area or delivered to other Enterprise units as feed material. Major Plant Components • DeEthanizer column • DePropanizer column • Debutanizer column • Deisobutanizer column • Wet Surface Air Coolers • Gas fired hot oil and regenerate gas heaters • Compression Equipment • Heat exchangers • Pumps

Deisobutanizer Unit. The deisobutanizer (DIB) unit is used to manufacture isobutane and normal butane from mixed butane streams. The Butane mixtures arrive at the Mont Belvieu Complex via pipeline and enter the DIB unit from the butamer units, or from the Mont Belvieu Complex storage facility, as commercial butane mixtures. The mixed butanes are routed to the deisobutanzier distillation column, where the manufacturing of isobutane and normal butane occurs. The overhead vapor stream from the column is isobutane, which is compressed into liquid phase isobutane. The liquefied isobutane product is split into two streams, one providing reflux for the column, and the remaining stream sent to the storage area or delivered to other Enterprise units as feed material. Major Plant Components • DeEthanizer column • DePropanizer column • Debutanizer column • Deisobutanizer column • Wet Surface Air Coolers • Gas fired hot oil and regenerate gas heaters • Compression Equipment • Heat exchangers • PumpsPumps • Ancillary tanks (See Tank Chart set forth below) Exhibit 4

Deisobutanizer Unit. The deisobutanizer (DIB) unit is used to manufacture isobutane and normal butane from mixed butane streams. The Butane mixtures arrive at the Mont Belvieu Complex via pipeline and enter the DIB unit from the butamer units, or from the Mont Belvieu Complex storage facility, as commercial butane mixtures. The mixed butanes are routed to the deisobutanzier distillation column, where the manufacturing of isobutane and normal butane occurs. The overhead vapor stream from the column is isobutane, which is compressed into liquid phase isobutane. The liquefied isobutane product is split into two streams, one providing reflux for the column, and the remaining stream sent to the storage area or delivered to other Enterprise units as feed material. Major Plant Components • DeEthanizer column • DePropanizer column • Debutanizer column • Deisobutanizer column • Wet Surface Air Coolers • Gas fired hot oil and regenerate gas heaters • Compression Equipment • Heat exchangers • PumpsPumps • Ancillary tanks (See Tank Chart set forth below) Tab # 8