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Posted by HeatPro on May 25, 2006 at 13:56:58:
In Reply to: Re: copper tube boiler groaning/vibrating posted by Dave on May 25, 2006 at 13:18:30:
I don't think much of the idea. The boiler was flushed when you changed piping several times, so contaminants would be difficult to believe - although possible. Why this sound didn't occur before with the old setup is a ponder. Although you did say it was noisy last year. Couldn't have been more crud put in, just the antifreeze is a different medium. Your result of less noise can be dilution of the antifreeze mixture as he flushed the exchanger.
Is there a valve on the line you can change to see the result of first altering flow rate? There can be a bend in the tubing that acts like a whistle that can change pitch of the mixture with a different flow rate. As long as you have a good gauge where you can really read a true reading, the TD across the exchanger can be raised with a lower flow rate to see the result. To guess without accurate instruments is just that - a blind guess. There is no definite starting point to arrive at a definite end point, just sounds.