Page 323 - Applied Process Design for Chemical and Petrochemical Plants Volume I

294 Applied Process Design for Chemical and Petrochemical Plants

(Figure 5-5 continuedfmm pmious page)

Figure 5-5s. Four-blade, vertical Figure 5-51. Standard six-blade
flat blade turbine impeller. Very vertical curved blade turbine
versatile, one of the most used impeller. Gives good efficiency
in wide application range. Cour- per unit of horsepower for sus- Figure 5-5X. Type R-500. Very Figure 5-5Y. A-31 0 Impeller.
tesy of Philadelphia Gear Corp. pensions, mixing fibrous materi- high shear radial flow impeller Develops 50% more action than
als. Gives high pumping capaci- for particle size reduction and ordinary propellers and is geo-
ty. Courtesy of Philadelphia Gear uniform dispersion in liquids. By metrically similar for accurate
Corp. permission, Lightnin, (Formerly scale-up. By permission, Light-
Mixing Equipment Co.) a unit of nin, a unit of General Signal.
General Signal. (Formerly Mixing Equipment
CO.)

Figure 5-52. A-410 Composite Impeller. Strong axial flow at very
high flow efficiency. Operates through a wide range of viscosities.
By permission, Lightnin, (Formerly Mixing Equipment Co.) a unit of
Figure 5-5U. Shrouded turbine Figure C5V. Turbine with three, General Signal.
for high pumping capacity. Usu- four, or six radial blades. Handles
ally used with low static heads, wide range of applications. Cour-
creates minimum of direct shear. tesy of International Process continuedfiompa~ 291)
Courtesy of International Process Equipment Co., Div. of Patterson tipoise. Performs much like a marine propeller,
Equipment Co., Div. of Patterson Foundry and Machine Co. but does not have some of its disadvantages.
Foundry and Machine Co.
6. Cost: moderate, less than marine propeller.

F. Double-Spiral Impeller [ 251
1. Used for viscous materials; has inner and outer
flights.
2. The inner flights pump down, and the outer
flights pump upward.
3. Diameter of inner flight is one-third the impeller
diameter.
4. Width of outer ribbon is one-sixth diameter of
impeller.
5. Impeller height is equal to its diameter.
Figure 5-5W. Jet-flow mixer. Twin flow jets from submerged cen- 6. Available in 20 in. to 120 in. diameter for one to
trifugal pump allow for a maximum hydraulic shear per unit of power 250 motor hp, and speeds of 5.5 to 45 mph.
input, high velocities useful for thick slurries. By permission, Penny,
W. R., Chem. Eng., Mar. 22, 1971, p. 97 [31]. 7. Cost: moderate