White cyrstals at seal of heat exchanger? - SailNet Community
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White cyrstals at seal of heat exchanger?

Here goes: So I'm doing some routine cleaning and checking of things on Aeolus and I notice that at the end of my heat exchanger there is a noticeable build up of white crystals. This is at the end where there is a rubber gasket and the end cap is removable. The white crystals are right around the rubber gasket between the exchanger and the end cap. I had just replaced my zinc and pulled it out again to make sure it was fine and it was. Maybe 10% gone. No other signs of corrosion.

What would cause these white crystals to form? I assume they are some salt, but since the exchanger doesn't leak, how would the water get out to form them? For that matter, I get these same crystals on my PSS shaft seal on the stationary side. What's happening? I get that it is some precipitate somehow, but can't figure out how or why.

Basically, what is it, why is it there? Any help is appreciated.


Gulf 32
Bainbridge Island, WA

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