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Got to agree with Pedro on this one; I have often suspected that if these systems get air bound, they develop a pressure surge not unlike the water "hammer" you get in home heating systems or water lines when they have air in them, which the tanks apparently do not like. Systems that have been refilled under vacuum do not seem to have anywhere near the number of tank failures that systems that have been "burped" after refilling under atmospheric pressure, and systems that have experienced problems with air trapped in them seem even higher.
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“Anything really new is invented only in one’s youth. Later, one becomes more experienced, more famous – and more stupid.” - Albert Einstein
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