초록 ▼

A method and apparatus are shown for controlling tank vapors on a petroleum storage tank of the type having a tank vapor line which leads from the storage tank for transporting relatively low pressure gas vapor to a relatively higher pressure gas sales line. An intensifier piston is installed in the

A method and apparatus are shown for controlling tank vapors on a petroleum storage tank of the type having a tank vapor line which leads from the storage tank for transporting relatively low pressure gas vapor to a relatively higher pressure gas sales line. An intensifier piston is installed in the tank vapor line between the storage tank and the gas sales line. The intensifier piston is operated to increase the pressure of the gas vapor exiting the petroleum storage tank to a higher relative discharge pressure, whereby the higher pressure discharge gas can be passed directly to the gas sales line.

대표청구항 ▼

A method for controlling tank vapors on a petroleum storage tank located at a petroleum facility, the storage tank having a tank vapor line leading from the petroleum storage tank for transporting relatively low pressure gas vapor to a relatively higher pressure gas sales line, the method comprising

A method for controlling tank vapors on a petroleum storage tank located at a petroleum facility, the storage tank having a tank vapor line leading from the petroleum storage tank for transporting relatively low pressure gas vapor to a relatively higher pressure gas sales line, the method comprising the steps of: installing an intensifier piston in the tank vapor line intermediate the petroleum storage tank and the gas sales line; operating the intensifier piston to increase the pressure of the gas vapor exiting the petroleum storage tank to a higher relative discharge pressure, whereby the higher pressure discharge gas can be passed directly to the gas sales line; driving the intensifier piston by means of an inlet gas taken from a source available at the petroleum facility, the inlet gas having a higher relative pressure than the required discharge pressure of the higher pressure discharge gas which is discharged from the intensifier piston; providing a control means for cycling the intensifier piston, whereby relatively lower pressure gas vapor exiting the petroleum storage tank is drawn into the intensifier piston at a selected end thereof and relatively higher pressure discharge gas is discharged at an opposite end of the intensifier piston; wherein the control means is a shuttle valve; and wherein the inlet gas used to drive the intensifier piston is combined with the higher pressure discharge gas which is discharged from the intensifier piston during cycling of the intensifier piston, whereby the intensifier piston operates as a closed system with no emissions.