Equistar Chemicals LP, Houston, will discontinue operations at its polyethylene plant at Port Arthur, Tex., by Feb. 28, the company said Monday. It plans to permanently shut down the facility. The plant includes a 240 million lb/year high density polyethylene (HDPE) reactor and a 160 million lb/year low density polyethylene reactor, as well as a 300 million lb/year HDPE reactor shut in 2 years ago.