Fuel Storage Tank Calibration

What are the shape, dimensions, orientation, and type of heads for this tank?

The tank is actually actually a cylindrical tank with a capacity of 10,000 liters with D=1.75m, L=4.5m, supported horizontally with flat base, i would like to know the close approximation of the fuel level inside the tank to monitor the day-day fuel consumption of the plant. Thank You.

→ Perry, "The Chemical Engineer's Handbook", any edition. The mathematics is relatively simple and may be found in the chapter on mathematics.

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I'm guessing that the tank wall is 10 mm thick; slight variation from this should be insignificant for your purpose. This makes the internal dimensions Φ1.73 m x 4.48 m, and the full volume 10,530 L (unless there are internal structures).

If the tank is vertical, each 100 L ≈ 4.2545 cm. (448x100/10,530)

If the tank is horizontal, and the fuel is at height h above the inside bottom, then the fuel volume V is:

V = 1000 [pi 0.865² 4.48 {cos-1[(0.865-h)/0.865] 0.865² 4.48 /180} - (0.865-h) √(1.73h+h²)].

(I think, but ± the effect of 3 beers...) A spreadsheet might be handy here.