I am afraid sir that if you dont know this basic step then you dont have any business trying to start up a new refinery. Anyone expecting to operate a new Grassroots should have been going thru a year long process of simulation on virtual units in a training trailer for that purpose given by an ex-operator who makes military drill seargents look like girl scouts.
This is not an OJT program – refineries are far too complicated and dangerous for anyone trying to do it using training wheels.