CuNi Piping with Carbon Steel Valves 1

[NeilDS]

I am working on an application where 70/30 CuNi piping has been specified for JP5 delivery. The end user of the JP5 has carbon steel valves and connections that the CuNi piping has to mate up to. Are there any corrosion problems with the mating of these dissimilar metals and JP5?

 

[EdStainless]

You should have no trouble as long as there is no water.
What about the outside? If this is buried you may have a big problem.

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Corrosion never sleeps, but it can be managed.

http://www.trenttube.com/Trent/tech_form.htm

 

[NeilDS]

It is outside is in a ventilated space. The outside may see a little sea water on a rare occasion

 

[EdStainless]

As long as the fuel is dry there shouldn't be any internal issues.
You may want to make sure that the exterior of the valve has a high quality coating prior to instalation. Sea fog can eat the heck out exposed CS, especially when it is in contact with more noble alloys.

= = = = = = = = = = = = = = = = = = = =
Corrosion never sleeps, but it can be managed.

http://www.trenttube.com/Trent/tech_form.htm

 

[mshimko]

I've a different view. I've never seen a marine fuel system without at least some water in it; and I've never seen anything on a marine vessel that can be kept 100% dry.

I think there will be a problem in this situation. In fact, I have a photograph from a shipcheck years ago of a similar mix on a large ship, and the steel parts are extremely corroded. I show this photo as an example of what not to do.