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Harold, give the guy a break QUIT talking engineering and pump curves and horse power Vs head pressures or cavitation etc.
OK Michael, check the circulator for the proper mounting as per manufactures directions (get the name of the circulator) send a post card to the manufacturer and hopefully they will explain the proper way to take the load off the motor mounts.
A lot of stumble bums have no idea how to properly support these motors and only have the motor hanging off the piping and this sets up a strain on the impeller and housing and thus causes weird sounds to travel.
FORGET the “Gravity SYSTEM” as it is very inefficient and what it is nature going slowly heating this house.
The gravity way is simple, hot water rises cold being heaver sinks this causes a natural circulation VERY TIME CONSUMING to say the least.
Want to fine tune this old system really to make it work fantastic USE NON ELECTRIC ZONE VALVES at each radiator.
Do NOT call a “heating GUY” or a tech or other fancy name for an unlicensed person.
Call a Licensed plumber and heavens forbid NO engineer as they will only confuse you with facts
Believe it or not an old two pipe system is so much better then that unground CRAP folks are pushing today.
Do not be concerned about redesigning this great kind of system JUST concentrate getting it Quiet like it supposed to be.
Have you LMP try holding this circulator when your calling for heat and SEE if it gets quit OUT of balance impellers will cause sound waves to travel
Also try to get the HP and RPM 1750 on up You may have a high head
(HV) circulator in lieu of a little red B&G (GREAT PRODUCT)
Hey feel free to E mail me privately anytime if you need advice AND ILL Discuss more options with Harold when I get him alone again.