Determining a change in volume of fluid added or removed from a vessel

A method of determining a change in volume of fluid within a vessel having a substantially cylindrical shape, the vessel having known interior dimensions, and the vessel having a known interior total volume, the method comprising:

• (a) measuring a first surface level of fluid within said vessel;
• (b) measuring a first roll value of said vessel;
• (c) measuring a first pitch value of said vessel;
• (d) calculating a first volume of fluid within said vessel using the known interior dimensions of said vessel, said known interior total volume of said vessel, said first surface level of fluid within said vessel, said first roll value of said vessel, and said first pitch value of said vessel;
• (e) adding fluid to said vessel or removing fluid from said vessel;
• (f) measuring a second surface level of fluid within said vessel;
• (g) measuring a second roll value of said vessel;
• (h) measuring a second pitch value of said vessel;
• (i) calculating a second volume of fluid within said vessel using the known interior dimensions of said vessel, said known interior total volume of said vessel, said second surface level of fluid within said vessel, said second roll value of said vessel, and said second pitch value of said vessel;
• and
• (k) comparing said first volume of fluid within said vessel and said second volume of fluid within said vessel, thereby determining a change in volume of fluid within said vessel.

An apparatus for determining a change in volume of fluid within a vessel having a substantially cylindrical shape, wherein said vessel has known interior dimensions, and said vessel has a known interior total volume, said apparatus comprising:

• (a) a fluid level detector that detects fluid levels within said vessel,
• (b) a tilt sensor having an x-y plane, wherein said base has an x-y plane, and said tilt sensor is positioned such that said x-y plane of said base and said x-y plane of said tilt sensor are parallel to each other, said tilt sensor providing a roll value of said vessel and a pitch value of said vessel;
• and
• (c) a computing device comprising at least one input interface programmed for communicating with a database comprising said known interior dimensions of said vessel and said known interior total volume of said vessel, and a software program programmed for calculating volume of fluid within said vessel;
• wherein said fluid level detector is communicatively connected to at least one input interface of said computing device, and said tilt sensor is communicatively connected to at least one input interface of said computing device;
• the computing device is further programmed for communicating:
• a first surface level of fluid within said vessel from said fluid level detector to at least one input interface of said computing device,
• a first roll value of said vessel from said tilt sensor to at least one input interface of said computing device, and
• a first pitch value from said tilt sensor to at least one input interface of said computing device;
• wherein the fluid level detector is configured for communicating a second surface level of fluid within said vessel from said fluid level detector to at least one input interface of said computing device;
• wherein the tilt sensor is configured for communicating:
• a second roll value of said vessel from said tilt sensor to at least one input interface of said computing device, and
• a second pitch value from said tilt sensor to at least one input interface of said computing device;
• and
• wherein said software program is programmed for:
• calculating a first volume of fluid within said vessel using the known interior dimensions of said vessel, said known interior total volume of said vessel, said first surface level of said fluid within said vessel, said first roll value of said vessel, and said first pitch value of said vessel,
• calculating a second volume of fluid within said vessel using the known interior dimensions of said vessel, said known interior total volume of said vessel, said second surface level of said fluid within said vessel, said second roll value of said vessel, and said second pitch value of said vessel,
• comparing said first volume of fluid within said vessel and said second volume of fluid within said vessel, and
• determining said change in volume of fluid within said vessel.