Inserting Stainless steel blades into a Nodular Iron turbine diaphragm

In summary, the conversation discusses the issue of preventing blades from melting when pouring nodular iron into a piece mold. The individual is seeking advice or literature on successful methods for this process. The recommended source advises against using casting as it is inaccurate and lacks strength, while welding is the most common and cost-effective method for fabricating a diaphragm.
  • #1
Osvaldo
27
1
TL;DR Summary
Blades are part of a steam turbine diaphrams, and should be inserted into the casting part.
Would need some advise on how to prevent the blades from melting when pouring the nodular iron into the piece mold. If somebody has experience on the matter or can recommend literature that could help in developing a successful .
 
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  • #2
I found this. They recommend against it.

“To accommodate installation of the rotor, the diaphragm is split into equal halves creating a horizontal joint. The outer ring supports the diaphragm in the case while the inner ring hangs free. The solid structure can be achieved by one of the following manufacturing methods:
 Welding
 Casting
 Pinning
 Machining from a solid plate
Welding is the most common, reliable, and cost effective method of diaphragm fabrication. Casting a diaphragm, consisting of cast iron rings and stainless steel vanes, is inaccurate and does not have sufficient strength. “

https://turbolab.tamu.edu/wp-content/uploads/2018/08/METS2Tutorial2.pdf

page 5.
 
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1. What is the purpose of inserting stainless steel blades into a nodular iron turbine diaphragm?

The purpose of inserting stainless steel blades into a nodular iron turbine diaphragm is to improve the overall strength and durability of the diaphragm. Stainless steel is known for its high strength and corrosion resistance, making it a suitable material for use in turbine components.

2. How are the stainless steel blades inserted into the nodular iron diaphragm?

The stainless steel blades are typically inserted into the nodular iron diaphragm through a process called brazing. This involves heating the diaphragm and blades to a high temperature and using a filler material to bond them together.

3. What are the benefits of using stainless steel blades in a nodular iron turbine diaphragm?

Using stainless steel blades in a nodular iron turbine diaphragm can provide several benefits. These include increased strength and durability, improved corrosion resistance, and the ability to withstand high temperatures and pressures.

4. Are there any potential drawbacks to inserting stainless steel blades into a nodular iron diaphragm?

One potential drawback of using stainless steel blades in a nodular iron turbine diaphragm is the cost. Stainless steel is generally more expensive than other materials, so this may increase the overall cost of the diaphragm. Additionally, the brazing process may require specialized equipment and expertise, adding to the cost.

5. How do stainless steel blades affect the performance of a nodular iron turbine diaphragm?

The addition of stainless steel blades can improve the performance of a nodular iron turbine diaphragm in several ways. The increased strength and durability can help the diaphragm withstand higher speeds and pressures, resulting in improved efficiency and reliability of the turbine. Additionally, the corrosion resistance of stainless steel can help prolong the lifespan of the diaphragm.

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