Temporary production system and separator with vapor recovery function

A closed vertical separator for use in a temporary production system for an oil well, the temporary production system comprising a production line connected to the oil well, a sand separator connected to the production line, the sand separator having a fluid outlet connected to a choke manifold and a solids outlet connected to a sand dump line, the closed vertical separator comprising:

• a diameter D and height H, and a top and a bottom;
• a first axis defined by the diameter of the closed vertical separator and a second axis defined by the height of the closed vertical separator;
• a first inlet receiving fluid flow from the choke manifold and a second inlet receiving flow directly from the sand dump line, a first flow diffuser connected to the first inlet and a second flow diffuser connected to the second inlet, the first flow diffuser and second flow diffuser contained within the closed separator;
• wherein the first flow diffuser and the second flow diffuser are mounted in parallel and mounted perpendicular to the second axis;
• the first diffuser and the second diffuser each comprise a pipe having a plurality of slot banks, each slot bank comprising a plurality of slots, each slot having a long axis aligned along the first axis;
• a liquid dump line discharging liquids to at least one closed tank;
• and
• a vapor discharge line discharging gas and vapor to a vapor recovery unit.