Used 45 MM SCFD x 2 Nitrogen Rejection Units (NRU) built in 1983. The NRUs are designed to produce the follow products from natural gas containing 80% nitrogen: (a) Ethane-rich gas, suitable for de-methanation; (b) Methane-rich gas, to be used as fuel or sales gas; (c) A waste nitrogen stream, vented to atmosphere or used for rejection. The NRU uses methane (C1) as a refrigerant. There are 5 streams in the process: 1) Low pressure C1; 2) High pressure C1; 3) C2+ stream; 4) Feed gas; 5) Vent stream. The gas product is pressured at 650 psig.