Objective of this paper is to highlight the problem of high concentration Hydrogen Sulfide (H2S) in depurator flotation unit system at Oily Water Treatment Plant (OWTP) Pertamina Hulu Energi Offshore North West Java (ONWJ), Central Plant Processing Facilty and identification impact quality of dry crude to storage. The methodology to reduce accumulation Hydrogen Sulfide in depurator unit is using venturi tube blower system. An innovation to install venturi tube blower has been tested based on degradation of concentration and dry crude quality in Floating Storage Offloading (FSO) Arco Ardjuna prior to export. The result of application venturi tube blower showed that accumulation of Hydrogen Sulfide gasses down to the lowest point and was found very effective. Conclusion from this paper are application of venturi tube blower has proven to capture and remove the concentration Hydrogen Sulfide up to 80% and in economical aspect the requirement cost for modification are very minimum.