Gould 0738 wrote:

My insurance company seems to have determined that the cause of the failure was
the aftercooler. Their surveyor pulled the zinc plug on the aftercooler and
found an "inadequate" amount of zinc on the plug. (It was ready to be changed).
The surveyor immediately concluded that the aftercooler had not been properly
maintained with zincs over the years.

You are joking, right?

Did they open the cooler and determine the mode of failure?

If he can show that the tubes or sheets are leaking due to electrolysis
then he can claim poor maintenance. As long as there is some zinc
remaining (a couple of percent of cooler area) there is adequate
protection. Demand that he provide documentation from the manufacturer
to indicate that the area of zinc remaining was below that which
protection is deemed "adequate."

I don't know who their surveyor is but if all he did was look at a zinc
and conclude that the failure was due to that zinc he is a waste of oxygen.

Let me know if you want an independent survey.

Rick