Two-phase expanders manage feed-gas changes

Katarzyna Chołast PGNiG SA Odolanow, Poland John C. Heath Ebara International Corp. Sparks, Nev. Based on a presentation to GPA Europe 30th Annual Conference, Sept. 18-20, 2013, Edinburgh Modification in 2003-04 of Polish Oil & Gas Co.'s (PGNiG) nitrogen rejection unit (NRU) at its natural gas and helium plant in Odolanow addressed a feed-gas composition that differed from the one for which the plant was originally designed in the 1970s. The modification consisted of adding two-phase turboexpanders parallel with Joule-Thomson (J-T) valves, which then became standby for expanders being used during start-ups or shutdowns. After nearly 10 years of service, this new process has proven ...

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