/emerson-exchange/b/weblog/posts/petrobras-flows-on-a-ten-year-journey-of-plant-improvementby Walt Boyes Roberto Gorbarán, instrument and electrical supervisor for Petrobras’ Zarate polystyrene plant, is a serial presenter at Emerson Exchange. Over the past ten years, he has presented a number of papers on the improvements the Zarate planten-USTelligent Community 13