Turbine Rotor Blades

Can you find out from the manufacturer what the original material is, and whether they agree with this recommendation?

Sure, It'll be fine.

Thanks my Dear for giving right direction.

Regards

M.B

It depends upon the warranty and support arrangements that are in place with thee manufacturer of the turbine, which the forum currently knows nothing about, and which are commercially sensitive information and therefore private between the manufacturer and the end user. So, discuss the matter directly with the manufacturer under the terms of the contractual arrangements that are currently in place.

Good luck.

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An anonymous forum is hardly the place to go for this advice.

Ask the local manufacturer to make a presentation here on CR4, and we'll take a vote.

You claim very often that important problems cannot be solved with unknown "professionals" and out of a sudden you suggest a majority vote of same team ! What a change !!

How many of us have a solid knowledge about materials used for turbine blades ?

How can we estimate the blades loading without any information about the turbine its working parameters ?

My first sentence says, "An anonymous forum is hardly the place to go for this advice."

This does not deviate from my usual admonition to consult known technical experts, not an anonymous forum, such as CR4.

The second statement was made with the knowledge that:

1. The OP, Muhammad Bilal Bhatti, very likely is not capable of inducing his local manufacturer to actually suffer the insult of addressing an anonymous forum.

2. The "solid knowledge" of members is in no way known to anyone.

3. We are a group of people. As you say, how can we estimate anything from the pitifully inadequately amount of information provided by this OP or most.

To quote Rhett Butler in Gone With the Wind, "Frankly, my dear, I don't give a Damn!

I would not deviate from the original equipment manufacturer material specifications.

The liability and risk is too high and no good could come from this.

Not only are turbine blades specific to the design but they also require special coatings that may have eroded during operation and metallurgy testing might not be accurate.

You should be able to contact the turbine OEM directly for the information.

Safety should be first priority as installing incorrect turbine blades will result in catastrophic failure and could well end up causing multiple casualties. (deaths)

Whats wrong with the old ones? Sounds like a scam to get some money out of your pockets. Is there a reason to replace the blades and if yes what is the manufacturers recommendation?

Correct! If it ain't broke don't fix it. Sounds like OP is trying to justify a "business" decision without any good engineering reason.

No....

The following are the applications for stainless steel grade 430:

• Dish washer linings
• Refrigerator cabinet panels
• Element supports and fasteners
• Stove trim rings and chimney liners
• Automotive trim and lashing wires

http://www.azom.com/article.aspx?ArticleID=996

"Blade Material and Blade Types:

Among the different materials typically used for blading are 403 stainless steel, 422 stainless steel, A- 286, and Haynes Stellite Alloy Number 31 and titanium alloy. The 403 stainless steel is essentially the industry's standard blade material and, on impulse steam turbines, it is probably found on over 90 percent of all the stages. It is used because of its high yield strength, endurance limit, ductility, toughness, erosion and corrosion resistance, and damping. It is used within a Brinell hardness range of 207 to 248 to maximize its damping and corrosion resistance. The 422 stainless steel material is applied only on high temperature stages (between 700 and 900°F or 371 and 482°C), where its higher yield, endurance, creep and rupture strengths are needed. The A-286 material is a nickel-based super alloy that is generally used in hot gas expanders with stage temperatures between 900 and 1150°F (482 and 621°C). The Haynes Stellite Alloy Number 31 is a cobalt-based super alloy and is used on jet expanders when precision cast blades are needed. The Haynes Stellite Number 31 is used at stage temperatures between 900 and 1200°F (482 and 649°C). Another blade material is titanium. Its high strength, low density, and good erosion resistance make it a good candidate for high speed or long-last stage blading. Blades are made of alloy steel which mainly contains carbon, chromium, nickel, molybdenum X20 and x20 are the material specification which contains the alloying elements in given percentage."

...required reading...

http://www.irjes.com/Papers/vol3-issue2/E03023248.pdf

Thanks for giving nice support.

Regards

Read the manuals. There are spare parts recommended by manufacturer. They know best.

If there is no other resort at all, accept their offer but ask their warranty in safety and part life endurance. It should withstand not less than the same lifespan or number of hours your previous spare last. Otherwise, you get your money back or they supply new item.

Dear Mr. MuhamadBilal Bhatti,

You have referred "One of our local manufacturers is recommending........." Is he a servicing/repairer or the Turbine Manufacturer.? If he is the Manufacturer, his advise OK.

If he is a repairer, perhaps it may not be worth to take risk which may lead to catostrophic disaster, though the repairer is capable of advising, but during execution of the job, some times critical item is compramised.

The above suggestion is in the over-all intrest of the company, safety of equipment, safety of operating staff as we also have social responsibility.

DHAYANANDHAN.S

GA! Only factory authorized representatives should be allowed to get involved with a project like this.

Oh my heavens the stories I have heard from the field service guys at Mitsubishi after having to re-repair a turbine that someone thought they new better than the OEM how to do the job.

Most of the times the repairs were completely laughable if caught before the restart, after the restart they became unbelievably expensive!