From the graph shown in the illustration, determine the size of the regulating ring required for the proper operation of the fuel oil centrifuge if the fuel oil specific gravity is 0.9 kg/dm3 at 68°F, and the separating temperature is 158°F. Illustration MO-0113
• Use the regulating ring size curves (Ø 86, Ø 89, Ø 92, etc.) on the MO-0113 graph. • Relate the given specific gravity at 68°F to the separating temperature of 158°F (about 70°C) on the x‑axis. • Make sure you are reading along the correct Q (oil) scale, not the water curve.
• Where does the vertical line for 158°F separating temperature intersect the Q = 0.90 kg/dm³ horizontal line on the chart? • Which regulating ring curve label (Ø …) passes closest to that intersection point while remaining inside the white (acceptable) operating band? • How would your choice change if the density line were slightly higher or lower—does that move you to the next ring size up or down?
• Confirm you are using the oil density curve (solid line), not the dashed water line at the top. • Double‑check that you’ve converted 158°F ≈ 70°C so you are at the correct vertical grid line on the lower x‑axis. • Verify that the ring size you pick has its labeled curve running through or nearest to the intersection of 0.90 kg/dm³ and 158°F, staying within the white region.
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