Relentless Rust

Incompatible couplings, inadequately welded tank baffles can lead to corrosion and early tank failure

Question:

Why is the aluminum coupling atop my tank — where the pressure relief valve is located — continually being eaten away and corroded after only a few months of operation?

Robert Kerr

Denver, Colo.

Answer:

The pressure relief valve is made of brass. The aluminum coupling in...

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