Podcast
Questions and Answers
What is the primary consideration for selecting material for runners and buckets?
What is the primary consideration for selecting material for runners and buckets?
- Weight and ease of fabrication
- Fatigue hazards and erosion due to slit content (correct)
- Cost-effectiveness and aesthetic appeal
- High strength and resistance to corrosion
What type of alloy steel is used for small units?
What type of alloy steel is used for small units?
- High carbon alloy steel
- High quality alloy steel (correct)
- Low carbon alloy steel
- Stainless steel alloy
What is the composition of stainless steel used for very high head and large size plants?
What is the composition of stainless steel used for very high head and large size plants?
- 13% Cr and 2% Ni
- 13% Cr and 4% Ni (correct)
- 18% Cr and 8% Ni
- 15% Cr and 5% Ni
Why is the runner, nozzle, and associated components installed above the maximum water level of the tailrace?
Why is the runner, nozzle, and associated components installed above the maximum water level of the tailrace?
What is the primary material used for manufacturing the bucket?
What is the primary material used for manufacturing the bucket?
What is the purpose of the dividing wall in the bucket?
What is the purpose of the dividing wall in the bucket?
What is the primary purpose of the deflector in the nozzle-spear system?
What is the primary purpose of the deflector in the nozzle-spear system?
Why is the nozzle-spear system made of stainless steel (13% Cr, 4% Ni alloy)?
Why is the nozzle-spear system made of stainless steel (13% Cr, 4% Ni alloy)?
What is the advantage of the monocast system in the runner fabrication?
What is the advantage of the monocast system in the runner fabrication?
What is the purpose of finishing the nozzle-spear system to a very smooth surface?
What is the purpose of finishing the nozzle-spear system to a very smooth surface?
What is the consequence of rapid closure in the high velocity nozzle?
What is the consequence of rapid closure in the high velocity nozzle?
What is the shape of the buckets in the runner assembly?
What is the shape of the buckets in the runner assembly?
What material are the guide blades usually made of?
What material are the guide blades usually made of?
What material are the runner blades typically made of?
What material are the runner blades typically made of?
Which of the following materials is not commonly used for runner blades?
Which of the following materials is not commonly used for runner blades?
What material is used for the crown or hub of the runner?
What material is used for the crown or hub of the runner?
What type of construction is used to join the blades, crown, and shroud ring of the runner?
What type of construction is used to join the blades, crown, and shroud ring of the runner?
Why is the surface of the vanes made very smooth?
Why is the surface of the vanes made very smooth?
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