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In our hydrocracker unit the system pressure 140 bar. In case of recycle gas compressor get trip and we able to start within 5 minutes at that time system pressure reach 110 bar. In the recycle gas vendor provided booster pump for primary seals in case of DP less than 10 bar booster pump will start automatically.My question why we need this booster pump if we start the recycle compressor without this pump at system pressure 110 bar what the causes and effects?
 
Answers
14/03/2018 A: Emmanuel Aunde, Refining Company, lemma012@yahoo.com
I don't understand your system well but I am guessing the discharge of your RGC is used as ur sealing gas during normal operations. If the system is at 110bar, once you draw the gas into the RGC, it will start leaking to the atmosphere; this is because there is no gas at the discharge of your RGC to seal. Your booster pump will provide that function while your RGC generates flow and then head.