A modern centrifuge, similar to the device shown in the illustration, is opened for periodic cleaning. The most common cause of operating failure after reassembling is due to __________. Illustration MO-0012
β’ Modern self-cleaning fuel oil centrifuge construction and operation β’ Role of operating water (opening/closing water) versus mechanical seals in bowl operation β’ Effect of worn or permanently set O-rings on the sealing and discharge functions of the bowl
β’ Look at the illustration and trace what actually changes when you open, clean, and then reassemble the bowl β which components are disturbed every time? β’ Ask yourself which of the listed problems would most likely appear immediately after maintenance, even if the drive motor and fuel system are otherwise in good order. β’ Consider which component, if it does not function or seal properly, would prevent the bowl from building and maintaining the internal water/fuel interface needed for separation.
β’ Identify on the sketch where opening/closing water enters and how it acts on the sliding bowl parts. β’ Locate any O-rings or sealing surfaces in the bowl area and think about what happens if they become hard, flattened, or are reused. β’ Decide which options describe an issue that is directly caused by reassembly errors or neglected parts rather than by normal running conditions like back pressure or motor speed.
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