Method and system for tank overfill protection
AssigneeShell Oil Company
InventorsColin C. Rogers, John N. Baker, Joseph Estebanez
Life of this patent
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Abstract
A method and system for tank overfill prevention comprising the steps of supplying fluid to the interior of the tank by means of a dispenser, measuring the dispenser pressure P.sub.d and flow rate Q, determining at equal time increments .delta.t a number of quantities representing tank pressures, another quantity representing the rate of increase of tank pressure with respect to time, comparing the quantity thus obtained with a present critical value, and shutting off the fluid supply, if this said quantity exceeds the said preset critical value and if the said flow rate Q is less than a preset critical value.
Claims16
A method for preventing the overfilling of an LPG tank comprising:
- supplying LPG fuel to said tank while measuring the pressure and flow rate of said LPG fuel;
- determining for equal time intervals the tank pressure using the measured pressure and flow rate of said LPG fuel;
- determining from said tank pressures the rate of increase of the tank pressure with respect to time;
- comparing said determined rate of increase of tank pressure with a preselected rate of increase of tank pressure;
- and
- shutting off the LPG fuel if said determined rate exceeds said preselected rate and said flow rate is less than a preselected flow rate.
Dependencies are inferred from the claim text.