Recirculating soil gas reduction system

摘要

A system and method is disclosed for venting soil gas to the atmosphere. Activation of a gas flow means, such as a fan disposed within a housing, directs soil gas from a gas source through a coduit, a housing and a vent to thereby vent the gas to the atmosphere. A shell is disposed about the housing and the vent, thereby defining an annular shell conduit about the housing and vent. A shell outlet at the housing inlet provides fluid communication between the shell conduit and the housing inlet. The gas flow means causes the shell conduit to be under reduced pressure relative to atmospheric pressure. Significant discharge of soil gas from the ventilation system through ruptures or defects in the housing, the vent or the shell is prevented by reduced pressure in the shell conduit, which causes a draft of air or soil gas to be drawn through the apertures into the shell conduit for subsequent ventilation of a substantial portion of the air or soil gas to the atmosphere.