VAPOUR SPACE PRESSURE CONTROL SYSTEM FOR UNDERGROUND GASOLINE STORAGE TANK

摘要

A method for controlling pressure in the vapor or ullage space U of an underground storage tank 12 of volatile liquid fuel 14 includes treatment or conditioning of gaseous flow of vapor and air V and/or air A into the ullage space in a manner to increase the fuel vapor concentration of the gaseous flow toward saturation. A system for controlling pressure in the vapor or ullage space of an underground storage tank of volatile liquid fuel is also described.