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Yes, that is correct.

Curretly all are made from CS

Here is a photo of the faulty sectionhttp://files.engineering.com/getfile.aspx?folder=a84c1bc9-8cf8-4b22-b531-d882d1ddda2f&file=coil.png

Thanks guys for all this input. I cut a faulty section of a coil out to see there / how it failed. It failed on the bottom coil where the baseplate was welded onto the coil. The inside of the tube (at the bottom )was corroded quite badly, and it failed at the weakest spot, which was the weld...

Thanks guys for the above feedback. My application is rental fleet, so I have no control over how and what water they are using. 2knagar's idea of using 2205 duplex looks like a very good idea. Can any of you comment on wall thickness for 350 Bar?

I have a small diesel boiler, with steel coils which only last 12 months. If I change the material, which is best Stainless 316 or Titanium GR2? Or do any of you have any other recommendations? The tube size is 20mm, working pressure is 350Bar at 90 Deg Cel. Thea pplication is hot water for a...