Steel pipe nipple brazed to copper coil header

[NEplantengineer]

Recently came across a situation on a hvac chilled water cooling coil where the coil connections were comprised of steel pipe nipples brazed to the coil's copper header pipe. Does anyone know if this is common? Seems like this would invite a galvanic corrosion problem.

 

[Metalguy]

It can if the water doesn't have corrosion inhibitors.

"You see, wire telegraph is like a very long cat. You pull his tail in New York and his head is meowing in Los Angeles. Do you understand this? Radio operates the same way: You send signals here, they receive them there. The only difference is there is no cat." A. Einstein

 

[EdStainless]

It is common, and many of these that are over a decade old can't be taken apart because of corrosion.

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