Atyrau Oil Refinery LLP (AOR) Detailed Design for Delayed Coker Revamp Project Engineering calculations for Reactor Unit P-1, P-2, P-3, and P-4 provided due to:Replacement / reinforcement of steel structure;Replacement of reactors, incl. arrangement of central inlet, hydraulic opening system for bottom hatch, installation of nuclear level gauges;Replacement of grab cranes;Replacement of by-product pumps;Installation of K-1 Tower bottoms filter unit.