Used 10,900 BPD Selective Hydro-desulfurization Unit built in 2003. The overall aim of the SHDS process is to produce a low sulphur gasoline blending component from cat cracked gasoline with minimal octane loss. The reactions in the SHDS reactors are desulphurisation with minimal olefin saturation to prevent octane loss: D-24, D-1. The design treat gas ratio is 15 m3 of H2 per m3 of hydrocarbon feed, with a reactor pressure of 23.5 barg, and temperatures of 160°C (start of run) to 200°C (end of run).