Fluid gauging

A fluid-gauging system for measuring the quantity of fluid in a tank of the kind having an inlet, and where flow of fluid into the tank via the inlet causes a localized elevation of the fluid surface, the system comprising:

• at least one fluid-gauging probe located in the tank at a location away from said inlet to measure to height of fluid at said location;
• a sensor for providing an indication of the quantity of fluid flowing into the tank through said inlet;
• and a processor for providing an indication of fluid quantity, the processor being arranged to calculate from an output of said sensor the volume of fluid in a localized elevated region above said inlet caused by fluid flow into the tank through said inlet, and the processor being arranged to add the volume of said elevated region to a volume derived from an output of said probe.

A fluid-gauging system for measuring the quantity of fluid in a tank of the kind having an outlet, and where flow of fluid out of the tank via the outlet causes a localized depression of the fluid surface, the system comprising:

• at least one fluid-gauging probe located in the tank at a location away from said outlet to measure the height of fluid at said location;
• a sensor for providing an indication of the quantity of fluid flowing out of the tank through said outlet;
• and a processor for providing an indication of fluid quantity, the processor being arranged to calculate from an output of said sensor the volume of fluid in a localized depressed region above said outlet caused by fluid flow out of the tank through said outlet, and the processor being arranged to subtract the volume of said depressed region from a volume derived from an output of said probe.

A fluid-gauging system for measuring the quantity of fluid in a tank of the kind having an inlet, and where flow of fluid into the tank via the inlet causes a localized elevation of the fluid surface, the system comprising:

• at least one fluid-gauging probe located in the tank at a location in a region of said inlet to measure the height of fluid at said location;
• a sensor for providing an indication of the quantity of fluid flowing into the tank through said inlet;
• and a processor for providing an indication of fluid quantity, the processor being arranged to calculate from an output of said sensor the increase in height above a generalized fluid surface in said region caused by fluid flow into the tank through said inlet, the processor being arranged to correct the output of said probe to provide a height measurement reduced by said increased height, and the processor being arranged to use the corrected output in computation of fluid quantity.

A fluid-gauging system for measuring the quantity of fluid in a tank of the kind having an outlet, and where flow of fluid out of the tank via the outlet causes a localized depression of the fluid surface, the system comprising:

• at least one fluid-gauging probe located in the tank at a location in a region of said outlet to measure the height of fluid at said location;
• a sensor for providing an indication of the quantity of fluid flowing out of the tank through said outlet;
• and a processor for providing an indication of fluid quantity, the processor being arranged to calculate from an output of said sensor the decrease in height below a generalized fluid surface in said region caused by fluid flow out of the tank through said outlet, the processor being arranged to correct the output of said probe to provide a height measurement increased by said decreased height, and the processor being arranged to use a corrected output in computation of fluid quantity.