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In our hydrocracker unit we have recycle gas compressor and they are provided five ejectors to create vacuum in service condenser. Two ejectors for first stage and another two for second stage.And last ejector for start up. Why we need to use initially start up ejector and we can use first stage and second stage initially instead of start up ejector if we can there is any effect?
 
Answers
31/03/2017 A: Vijay Beleri, Rateau energy systems, v_beleri@hotmail.com
start up ejector is normally oversized and should be able to achieve the start up vacuum much faster. Also this vents direct to atmosphere for achieving vacuum quicker. there are no inter or after condensers to worry about.