What is draft tube? Discuss different types of the draft tube
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Basically, Draft tube is a conduit which connects the runner exit to the tailrace where the water is being finally discharged at atmospheric pressure from the reaction turbine.
Conical draft tube
Simple elbow draft tube
Elbow draft tube with varying cross section - circular inlet and rectangular outlet
Moody's spreading draft
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Answer:
Draft tubes are mainly classified in 4-types, and those are:
Simple Elbow draft tube. Elbow with a varying cross-section area. Moody Spreading tube. Conical Diffuser or Straight divergent.
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