FIGURE 3A FIGURE 3B SCR Process (Ethane Rejection Mode) C3 Residue Gas Residue Gas Compressor Inlet Gas Expander/ Compressor C3 SCR Process (Ethane Recovery Mode) Residue Gas Residue Gas Compressor Inlet Gas Demethanizer/ Deethanizer Expander/ Compressor C3 NGL Product LPG Product SCORE. This arrangement has costsaving advantages for modularization. In ethane rejection mode, the performance is similar to SCORE. The size and cost of a column for an SRC design is similar to that of an RSV column, but both are taller than a SCORE-only column. The results of the four design options for full ethane rejection are Demethanizer/ Deethanizer summarized in the top of Table 2. Ethane Recovery Flexibility The GSP, RSV and SRC designs also were considered for full ethane recovery mode operations for the Lancaster rich-gas design basis. The bottom of Table 2 summarizes the maximum ethane recovery mode results for the three process design options. Each design had similar refrigeration and front-end exchanger arrangements, so the process design reflux system performance alone was the dominant factor in the overall recovery-versus-horsepower results. A GSP design could achieve 95.4 percent ethane recovery at 99.7 percent propane recovery with enough residue and refrigeration horsepower. This re- 2017 22 nd APRIL 22-26 FOR MORE INFORMATION AND TO REGISTER VISIT: WWW.GASCOMPRESSOR.ORG/MEETINGS MARCH 2017 59http://WWW.GASCOMPRESSOR.ORG/MEETINGS