Lets refine it one more step. The expansion tank has a small opening
since the temperature change is seasonal (duration period of months).
A surge suppression tank has a large opening since the surge has a
duration period of milliseconds. They otherwise operate the same.
Roland
On May 15, 2008, at 4:52 AM, Russell wrote:
Roland reminds me of a military hangar we did with the same problem.
A large
expansion tank and a relief valve worked in this situation. In yours;
however, the tank should be smaller but it will be expensive.
Russell
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