Using load cells, and converting to volume is also a tried a trusted method, but it requires knowledge of the average density of the contents. Tanks can also change their dimensions with temperature. Tanks are rarely the exact dimensions and uniformity called out by the design drawings, and they often contain "inclusions" such as heat exchanger coils, mixer paddles, etc., so using liquid head pressure can often be the worst way to measure volume. Yes, Pelly09 sussed me out, 22/7 is probably good enough in the circumstances, especially when you take into consideration the rest of my post. If PV 100.0 THEN PV := 100.00 END_IF PI := (22.0/7.0) H := (PV / 100.0) * D a :=2 * ATAN(H/((2*H*D/2)-H**2)**0.5) Fc := (a-SIN(a)*COS(a))/ PI Vc := 0.25*PI*D**2*L*Fc*7.48 Vh := (3*D*12-2*H*12)*(H*12)**2*0.0000539681*42 G := Vc + Vh B := G / 42.0 Where: a REAL Standardğactor B REAL Standard Tank Barrels on Hand D REAL Standard Tank Diameter in Feet Fc REAL Standardğactor G REAL Standard Tank Gallons on Hand H REAL Standardğluid Height in Feet L REAL Standard Tank Seam to Seam Length in Feet PI REAL Standard Value for Pi PV REAL Standard Tank Level in % Vc REAL StandardĜylinder Volume on Gallons Vh REAL Standard Head Volume in Gallons You're looking for Vc You can get rid of the 2:1 head calc part and use the math that is in the STX in ladder. I have a structured text file that I turned into an AOI that I use to calculate the volume of a cylinder, laying on it's side, with 2:1 elliptical heads. The beer can on it's side version is a little more difficult (not impossible) than the beer can standing up.
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