Pipe SS304L, Butterfly Valve Body also SS304L?

[bildot]

Hi guys,

I am currently in a bind here.
Is there any ASME/ASTM code that specifies that body material of butterfly valve has to be the same as the pipe material?
So the service liquid is desalinated water, with TDS<10 ppm, pressure 7 bar, and T=40 deg C.
The pipe material that I have chosen is SS304L.
My butterfly valve's type is lug type, and currently I want to choose Ductile Iron as the body material, since butterfly valve's body is not the wetted part. There should be no issue with the water corroding the butterfly valve's body.
Since my butterfly valve is the lug type, I will connect the valve with the pipe by flange connection.
The flange material is also SS304L.
Will there be any corrosion issue if I choose ductile iron as the butterfly valve's body material?
Do any of you guys know the ASTM/ASME code that specify this issue?
While we are at it, I also want to ask, if I connect 2 flanges with different materials, for example, I connect SS flange with cast iron flange, with gasket in between, will there still be any corrosion issue?

Thanks guys for your help

 

[GD2]

Billy,
To specify a valve you will start with API 609. It cross-refers ASME Standards for design and materials. (example B16.34, ASME B16.5 etc etc....).

I am not a metallurgist/corrosion Engineer and therefore, can't handle your materiel selection part.

 

[mk3223]

May consulate with a Material/Metallurgical Engineer for the butterfly valve material as required for your process. The specified material should include the body, seat and dicc, etc., for the butterfly valve.

As said the valve has no wetted part, is it a lined valve? If yes, the ductile iron material may be fine for your service with a proper lining material.

 

[Gator]

Since this is desalinated water, should we infer that this is a marine environment?

 

[bildot]

Hi guys,

Thank you all for your replies.
Yes, it is in marine condition.

Butterfly valve's body is not the wetted part because inside the body, there will be valve seat.
So the water will only be in contact with the disc and the seat.

As per the suggestion, I will ask this question to the Corrosion Engineering thread.

Thank you so much for your helps

 

[EdStainless]

What is the conductivity of the water? (how well de-gassed is it?)

Just because the body isn't fully wetted doesn't mean that it is completely isolated.
Any water contact will result in accelerated corrosion of the iron.
Are there any other alloy options?

= = = = = = = = = = = = = = = = = = = =
P.E. Metallurgy, Plymouth Tube

 

[bildot]

Conductivity is 20-25 microS/cm.
The water will only be in contact with the seat since the seat is placed fully under the body (see the picture below)

The ductile iron body will fully be coated to prevent corrosion.
My current issue is that I need to prove that there is no issue with choosing Ductile Iron body even if the pipe material is SS304L, because of the reasons I have written in my first post.

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

I am hoping to prove this by any applicable ASTM code or any literature from books, but I am currently stumped.
Do you guys have any other suggestions or is the material really not recommended?

Thank you guys for your help

 

[gerhardl]

To my knowledge there is no standard that guarantee or prove no corrosion under the circumstances described. On the other hand it is a quite common combination for different fluids. But: the criteria for selection of valve and piping materials are multitude, both quality, surroundings, branch standards and common practice, price over lifetime and end users preference. You can technically prove a very low risk for corrosion, but why bother?

 

[Gator]

Dammit, I just got a new 28" external 4K monitor and now I'm gonna have to get a 40" 8K one just to view that link.

 

[bildot]

@Gator LOL I'm sorry I am still a noob on this website, I didn't know how to attach a picture.

I am trying to think of ways to optimize my budget price to my customer.
My boss wants me to find out if we use normal butterfly valve with ductile iron body instead of SS304L body.
The price difference for 1 valve can be up to 10 times, and I use almost 200 valves in my process.
You can imagine the total money that can be saved in valves.
Unfortunately, I'm only experienced in process engineering, not material engineering, that's why I am in a bind here.

There's always a gasket between 2 flanges, right?
Will this decrease corrosion possibility between flanges?
Or can the corrosion start from the bolts & nuts and then affect the flange?

 

[gerhardl]

Yes, thought it was the commercial aspect. For SS it will not be 10 times, perhaps with very low quality cast steel valves. The real difference can only be given by a real (preliminary) offer from a supplier for the full amount of both type of valves. And again: what is the best type for best price over lifetime considering maintenance. Is the valves placed in dry surroundings indoors?

 

[EdStainless]

The gaskets will not isolate them, there are still the bolts.
And expecting the CI body to always be dry is a bit of excess optimism.
When the lining leaks how long will will the CI body last?
To start with it will just dump a lot of Fe into the water, but eventually it will fail.
And this is in a place that no one can see until it gets severe. Not a good situation.
Get prices and check, the difference shouldn't be astronomical.

= = = = = = = = = = = = = = = = = = = =
P.E. Metallurgy, Plymouth Tube

 

[bildot]

I have gotten the price and it is really 10 times more expensive.
You do have a valid point for the corrosion issue.

If for example the body of butterfly valve is SS304 and the piping material is SS304L, will there still be corrosion issue?
SS304L is very uncommon to be used as butterfly valve body material, that is why the price is astronomical.