When we are designing the tankers, it is needed
Search the forum on calculating volume. Omit sheet metal from your search terms as this might reduce the number or quality of the returned links.
Can you upload your files?
For assistance with this, see Mr. Schroeder's FAQ:How can I attach a file to a forum post?
Lastly, at what levels will the tanks be considered full? Are the tanks a consistent cross-section as the elevation of the contents change?
Machinery's Handbook has some formulas for volume based on depth for a given tank type. These formulas are probably on the internet, too.
Check this thread out:
The 10th Weekly Power-User Challenge (September 15th, 2017): Measuring Wine Carafe
Retrieving data ...