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elliptic is a perfectly symmetrical graphics with its center as the origin. If establishing the right-angle coordinates on the tank’s cross section, the long axis of the oval can be taken as x axis and the short axis can be taken as y axis while the long and short axes are symmetric about the origin. We set the oval long axis length for , the oval short axis length for . At last, the axis along with the oil tank’s cylinder shaft direction and through the center origin will be taken as z axis, setting the length of z axis for .
Now two plane coordinate systems and  are given here. 
In cross section, the plane coordinate system of  is established as in figure 2: the elliptical long axis  m and the short axis m respectively. 
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