New device to prevent evaporative losses in any type of petroleum storage tanks and the elimination of pumps for unloading these.

摘要

The present invention relates to a novel device for preventing evaporation losses in any type of petroleum storage tank and for removing the discharge pumps therefrom. BR/ The device of the invention comprises a compressor (1) provided with regulating means for introducing air under determined pressure into the tank (3) above, above the level (4) of the internal liquid and maintaining said pressure at a value greater than the vapor pressure of said liquid to prevent evaporation thereof. Tapped valves (5) allow the exit of the air when the pressure is higher than the expected pressure, and close when it is lower, so that the internal pressure is always constant and sufficient for unloading the aforementioned tank without using auxiliary pumps of any type. BR/ The invention applies in particular to the warehouses and cisterns of service stations. / P