Blowers with mixed galvanized and SS piping

[cokeguy]

I´ve been digging through previous posts and references discussed in this forum, but I´m still not sure about this issue: We use 316L SS pipes to inject air for oxidation purposes into various limestone and sulphate slurry tanks, however, the blower´s discharge manifolds and all piping not contacting the slurry are galvanized steel. The threaded connections between SS and galvanized steel couplings and pipes are teflon coated, although obviously still in direct contact with one another at some point. Considering that air from the blower is dry and clean (at least as clean as the atmosphere), is there still risk of galvanic corrosion?

 

[berkshire]

cokeguy (Electrical)
If you have any atmospheric moisture at all, the stainless will strip the galvanizing off the steel at the joint.
B.E.

 

[cokeguy]

Once the galvanizing goes away, will the corroding effect stabilize or stop, or can we expect continued degradation within the joint and subsequent failure? Right now the joint is exposed to rainfall and sunlight, but we could easily cover it up so the only possible moisture contacting the joint would be atmospheric humidity (we are in a semi-desertic area, so ambient moisture is negligible).

 

[EdStainless]

I wouldn't worry about it. Unless you know that you have moisture in the lines they are probably fine.
The severity of galvanic corrosion depends on the conductivity of the environment. With little to no conductivity you will get no corrosion.

= = = = = = = = = = = = = = = = = = = =
Corrosion, every where, all the time.
Manage it or it will manage you.

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