Abstract: A temporary hydrocarbon well production system receives flow from a hydrocarbon well through a production line connected to the well. The production line flows into a sand separator, which has a fluid outlet connected to a choke manifold and a solids outlet connected to a sand dump line. A transportable and vertical closed separator receives flow through two separate lines from the choke manifold and from the sand dump line, which respectively flow into independent diffusing structures in the closed separator. Gas, vapors, volatile organic compounds, etc. are captured within the closed vessel and are discharged through a vapor discharge line attached to a vapor recovery unit for either further processing or incineration through a flare. A liquid dump line discharges liquids from the closed separator to at least one closed tank.