By using nomogram chart.
The graph shown above is one typical
of one found in a purifer instruction book for selecting appropriate gravity
disc size. Shown on the diagram is an example of an oil of sg 0.93 at 0'C. The
sg at 15'C for use with this graph is found by projecting along a horizontal
line to 15'C. This step would be omitted if the sg at 15'C was already known. A
line is then drawn parallel to the pre-drawn sloping lines. Where the drawn
sloping line cuts the appropriate oil supply temperature isothermal then This
becomes the selection point for the disc. This is found simply by ascertaining
which size band the point lies in.
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