Controlled Nitrogen Blanketing Systems
OwnerGregory E. Young, Zane A. Millerinventors
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Abstract
An underground storage tank maintenance system includes a system of monitors to determine pressure and humidity in the system. Inert gas may be supplied into the ullage of the tank. The inert gas may first pass through an interstitial space as between the primary storage and secondary containment, and then passed into ullage to capture contaminants on the way out of the vent to atmosphere. The system and method prevent hydrocarbons exiting to atmosphere. Humidify sensors may be set along vent to determine water contamination and trigger drying cycles. Pressure readings help identify system leaks.
Claims24
A method for removing water and/or water vapor from a tank, said method comprising the steps of:
- a. supplying an inert gas to a location within the tank;
- b. drawing the inert gas over the ullage of the tank;
- c. releasing the inert gas from the tank system.
The method of claim I further comprising the step of monitoring pressure in the system to identify a leak in the primary or interstice, and wherein said step of supplying comprises delivering dry inert gas continuously for a period of time at a set interval.
A system for drying the ullage and/or interstitial space in a tank comprising:
- a. an inert gas supply;
- b. tubing in fluid connection with said supply and an outlet along an interstitial space;
- c. a further outlet providing fluid communication between the interstitial space and a primary tank ullage;
- d. a vent in communication with said ullage and an external atmosphere.
The system of claim 20 further comprising a humidity sensor along said vent.
A method of determining true measure of fuel level in a tank comprising the steps of:
- a. testing the pressure within the tank system;
- b. testing the level of contents in an alternative fluid-connected chamber, and the pressure therein;
- c. measuring the height of the contents in the alternative chamber
- d. calibrating the relative height of the tank via measurement of the chamber and the relative pressures of the tank and chamber.
A method of monitoring pressure events in a tank, said method comprising the steps of:
- a. monitoring the pressure in a tank system via an over-pressurization reading;
- b. determining the maximum and minimum level of pressure in the tank.
Dependencies are inferred from the claim text.