the lube oil is discharged to the sump. The solids remain in the rotating unit. Other  factors  that  affect  separation  by  centrifugal force include the size of the particles, the viscosity of the fluids, and the length of time the materials are subjected to centrifugal force. Generally, the greater the difference in specific gravity between the substances to be separated and the lower the viscosity of the lube oil, the greater the rate of separation. PURIFIER  TYPES Two  basic  types  of  purifiers  are  used  in  Navy installations, and both types use centrifugal force. There are  principal  differences  in  the  equipment  design  and operating speed of the rotating elements of the two machines.  In  one  type,  the  rotating  element  is  a bowl-like container that encases a stack of discs. This is the  disc-type  DeLaval  purifier,  which  has  a  bowl operating speed of about 7,200 rpm. In the other type, the rotating element is a hollow cylinder. This machine is  the  tubular-type  Sharples  purifier,  which  has  an operating speed of 15,000 rpm. Disc-Type  Purifier Figure  10-33  shows  a  cutaway  view  of  a  disc-type centrifugal purifier. The bowl is mounted on the upper end of the vertical bowl spindle, and driven by a worm wheel and friction clutch assembly. A radial thrust bearing at the lower end of the bowl spindle carries the weight  of  the  bowl  spindle  and  absorbs  any  thrust created  by  the  driving  action.  Figure  10-34  shows  the parts of a disc-type bowl. The flow of fluid through the bowl and additional parts are shown in figure 10-35. Contaminated  fluid  enters  the  top  of  the  revolving  bowl through the regulating tube. The fluid then passes down the inside of the tubular shaft, out the bottom, and up into the stack of discs. As the dirty fluid flows up through the distribution holes in the discs, the high centrifugal force exerted by the revolving bowl causes the dirt, sludge, and water to move outward. The purified fluid is forced inward and upward, discharging from the neck of the top disc. The water forms a seal between the top disc and the bowl top. (The top disc is the dividing line between the water and the fluid.) The discs divide the space  within  the  bowl  into  many  separate  narrow passages or spaces. The liquid confined within each pass is restricted so that it flows only along that pass. This arrangement minimizes agitation of the liquid passing through  the  bowl.  It  also  forms  shallow  settling distances  between  the  discs. Any water separated from the fluid, along with some  dirt  and  sludge,  is  discharged  through  the discharge ring at the top of the bowl. However, most of the dirt and sludge remains in the bowl and collects in a more or less uniform layer on the inside vertical surface of the bowl shell. Tubular-Type  Purifier A  cutaway  view  of  a  tubular-type  centrifugal purifier is shown in figure 10-36. This type of purifier consists of a bowl or hollow rotor that rotates at high speeds. The bowl has an opening in the bottom to allow the dirty fluid to enter. It also has two sets of openings Figure 10-34.—Parts of a disc-type purifier bowl. 10-37


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