A multiphase separation system, comprising: a distribution line configured to feed a multiphase fluid into feed lines within the separation system, wherein the feed lines consist of an upper line, a middle line, and a lower line; the upper line configured to flow a first stream comprising oil into an oil section of a control volume; the middle line configured to flow a second stream comprising an oil/water emulsion into an oil/water emulsion section of the control volume; the lower line configured to flow a third stream comprising water into a water section of the control volume; and the control volume configured to adjust fluid flow rate at an outlet (222, 224), wherein the oil section, the water section, and the oil/water emulsion section each commingle at different heights of the control volume; characterised in that the system further comprises: a flow regulator in the upper line, the middle line, and the lower line, wherein the flow regulator comprises a perforated baffle, an adjustable perforated baffle, a gate valve, or any combination thereof, a control system configured to open and close the flow regulator; and a level detector coupled to the upper line, the middle line, and the lower line, wherein the level detector is adapted to measure a phase interface level of water and oil present in a line and to send a signal to the control system, wherein the separation system is implemented within a subsea environment, and the multiphase fluid comprises production fluids from a subsea well. a distribution line configured to feed a multiphase fluid into feed lines within the separation system, wherein the feed lines consist of an upper line, a middle line, and a lower line; the upper line configured to flow a first stream comprising oil into an oil section of a control volume; the middle line configured to flow a second stream comprising an oil/water emulsion into an oil/water emulsion section of the control volume; the lower line configured to flow a third stream comprising water into a water section of the control volume; and the control volume configured to adjust fluid flow rate at an outlet (222, 224), wherein the oil section, the water section, and the oil/water emulsion section each commingle at different heights of the control volume; characterised in that the system further comprises: a flow regulator in the upper line, the middle line, and the lower line, wherein the flow regulator comprises a perforated baffle, an adjustable perforated baffle, a gate valve, or any combination thereof, a control system configured to open and close the flow regulator; and a level detector coupled to the upper line, the middle line, and the lower line, wherein the level detector is adapted to measure a phase interface level of water and oil present in a line and to send a signal to the control system, wherein the separation system is implemented within a subsea environment, and the multiphase fluid comprises production fluids from a subsea well. a flow regulator in the upper line, the middle line, and the lower line, wherein the flow regulator comprises a perforated baffle, an adjustable perforated baffle, a gate valve, or any combination thereof, a control system configured to open and close the flow regulator; and a level detector coupled to the upper line, the middle line, and the lower line, wherein the level detector is adapted to measure a phase interface level of water and oil present in a line and to send a signal to the control system,