Calculate the volume of a vertical tank at any liquid level, with API MPMS 2.2A corrections for shell temperature, tilt, hydrostatic head, deadwood and floating roof. Get the result in m³, liters, barrels and gallons, referenced to 60 °F, 15 °C or 20 °C.
What is tank strapping?
Strapping, also called tank calibration or gauging, is the process of determining how much volume a tank holds at each liquid height. The result is the strapping table, which converts a level measurement into volume for inventory, receipt and dispatch of product.
How does this calculator compute the volume?
The tank's inside diameter gives the cross-sectional area, which is multiplied by the liquid height: V = (π/4)·Di²·h. You can enter the outside diameter or circumference and subtract the plate thickness, as in equation 2 of API MPMS 2.2A.
What corrections does it include?
Steel shell temperature (equations 8 and 9), for insulated and uninsulated tanks.
Tank tilt (equation 10).
Hydrostatic head of the liquid on the shell.
Tape rise over butt straps or weld beads (equation 3).
Deadwood and floating-roof displacement deductions, with a critical-zone warning.
What is it used for?
To estimate a tank's total and working capacity, the volume between the minimum and maximum operating levels, the available free space and the fill percentage. It is useful at terminals, refineries, storage plants and in tank design.
Does it replace a certified strapping?
No. It is an engineering estimation tool that assumes a shell of uniform diameter and a flat bottom. A certified strapping for custody transfer requires ring-by-ring measurements, bottom shape and a calibrated master tape, per API MPMS Chapter 2.