Floating, production, storage, and offloading (FPSO) unit is used in oil & gas industry to manufacture and process hydrocarbons and for storage of oil. This unit is designed to accumulate hydrocarbons produced by the production plant, and stores them until they are offloaded into a tanker or transferred through a pipeline. In addition, these units are effective in deep water or remote locations, where seabed pipelines are not affordable. Moreover, the need to install long-distance pipelines from the processing facility to onshore points is eliminated, which presents an affordable solution for smaller oil fields. Furthermore, on depletion of fields, the unit can be shifted to a new location.