1. "We're just starting now to look at a redesign of the draft tube ," 2. A "'hydraucone "'is a form of draft tube used with a hydro turbine. 3. It has a locking zipper, muffler and fell-length draft tube . $ 209. 4. Efficiency of this kind of draft tube is less almost 60% 5. Of greater concern is what happens in the turbulent water of the draft tube . 6. Efficiency of this type of draft tube is 90% 7. 2 . "'Simple elbow type draft Tube "'- It consists of an extended elbow type tube. 8. A higher turbine location, however, increases the suction that is imparted on the turbine blades by the draft tube . 9. After passing through the units, water is discharged through the draft tubes to one free surface and one full-flow tailrace tunnel. 10. It does this by distributing the water that exits from the turbine uniformly over the larger area of the draft tube exit.
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