Page 321 - Applied Process Design for Chemical and Petrochemical Plants Volume I

292 Applied Process Design for Chemical and Petrochemical Plants

Figure 55A. A flat blade turbine can han- Figure 5Sc. Curved-blade turbine creates
dle the majority of all fluid mixing applica- Figure 5-5B. Small openings are no prob- a dual suction flow pattern the same as the
tions when correctly applied. Its high lem with turbines. With blades removed, a flat blade. This design is used when rela-
pumping capacity makes it preferable for turbine can pass through openings about tively low shear is a requirement, when
general mixing operations. It is well adapt- M as large as the assembled impeller, or abrasion must be considered, and when
ed to the application of protective cover- impeller can be split, as above, to pass many other variables are of prime impor-
ings, such as lead, rubber and plastics. through openings If3 of turbine diameter. tance. Courtesy of Lightnin (formerly Mixing
Courtesy of Lightnin (formerly Mixing Courtesy of Lightnin (formerly Mixing Equipment Co.), a unit of General Signal.
Equipment Co.), a unit of General Signal. Equipment Co.), a unit of General Signal.

Figure 5-5E. Marine propeller is designed
with extra section thickness to give longest
life in conosive or abrasive materials. It is
polished to a high finish and accurately
Figure 5-5D. Gate paddle impeller is balanced. Many special propeller types Figure 5-5F. Lifter turbine is efficient for
designed for materials of high viscosity and alloys available. Satisfactory in 95% of pumping large volumes against static
and operates at low shaft speeds. It is applications. It drives liquid ahead in a heli- heads of less than 36 inches. As shown, it
most desirable for shallow, wide tanks and cal cone while doing considerable "work" is used below a draft tube. Inverted, it is
wherever low shear is a requirement. on material passing through it. Courtesy of used above an orifice plane in tank bot-
Courtesy of Lightnin (formerly Mixing Lightnin (formerly Mixing Equipment Co.), tom. Courtesy of Lightnin (formerly Mixing
Equipment Co.), a unit of General Signal. a unit of General Signal. Equipment Co.), a unit of General Signal.

Figure 5-56. Curved-blade turbine, devel-
oped especially for agitating fibrous mate-
rials such as paper stock. Also used on oil Figure 5-51. Flat blade pitched paddle. A
well drilling muds. This impeller gives fast, simple, low cost design that handles a
thorough turnover without need for the Figure 5-5H. A typical radial impeller agi- wide variety of jobs. Operating at low
usual tank baffling or mid-feather con- tator. Operates as agitating turbine or a speeds, it gives maximum pumping
struction. Courtesy of Lightnin (formerly conventional propeller, wide range of capacity with a minimum of turbulence.
Mixing Equipment Co.), a unit of General applications. Courtesy of Struthers-Wells Courtesy of Lightnin (formerly Mixing
Signal. Corp., Warren, Pa. Equipment Co.), a unit of General Signal.