Welding two different SS in SW Piping
Welding two different SS in SW Piping
(OP)
Hi,
I am replacing service water (lake water) piping at a power plant and I had a question in regards to welding two different medals. I am told that welding AL-6XN high alloy SS (20.5% Cr, 24% Ni, 6.3% Mo)to a 316 SS flange is still resistant to Microbiological corrosion (MIC). I don't see how this is possible since AL-6XN has higher concentrations of certain elements; however, I am told that since it is welded to a 316 SS flange and not a 316 SS pipe the water will not be able to developing pitting on the pipe. Let me know your opinions on this issue.
Nick
I am replacing service water (lake water) piping at a power plant and I had a question in regards to welding two different medals. I am told that welding AL-6XN high alloy SS (20.5% Cr, 24% Ni, 6.3% Mo)to a 316 SS flange is still resistant to Microbiological corrosion (MIC). I don't see how this is possible since AL-6XN has higher concentrations of certain elements; however, I am told that since it is welded to a 316 SS flange and not a 316 SS pipe the water will not be able to developing pitting on the pipe. Let me know your opinions on this issue.
Nick





RE: Welding two different SS in SW Piping
Independent events are seldomly independent.
RE: Welding two different SS in SW Piping
Steve Jones
Materials & Corrosion Engineer
http://www.linkedin.com/pub/8/83b/b04
All answers are personal opinions only and are in no way connected with any employer.
RE: Welding two different SS in SW Piping
Steve Jones
Materials & Corrosion Engineer
http://www.linkedin.com/pub/8/83b/b04
All answers are personal opinions only and are in no way connected with any employer.
RE: Welding two different SS in SW Piping
Is it possible to make this a flanged joint at the material change and use two different flange types ?
An insulating flange kit could also be used for those management prisses afraid of stray currents or galvanic corrosion...
RE: Welding two different SS in SW Piping
Independent events are seldomly independent.
RE: Welding two different SS in SW Piping
What if he calls for a lap joint flange at each joint: Then the water will "see": inside of pipe material | gasket material | inside of pipe material and never the 316 (or any other metal for that matter) flange material.
Also, the joints will be easier to remove for mussel cleaning and replacement.