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correct piping

Tom_121 Member Posts: 4
compression tank large enough for the system


  • Jay_38
    Jay_38 Member Posts: 5
    Water logging

    If a mixing valve is installed on a hot water system the cold fill and expansion tank should be teed into the boiler supply piping not the system supply piping? The circulator is on the system supply piping. I just want to be sure since this system is not piped like this. The big problem with the system is that the expansion tank (compression) instantly water logs. I isolated the tank and pressurized it with nitrogen to 50 psig and sprayed soap bubbles on the sight glass assembly. I found no leaks and after 30 minutes the pressure stayed the same. I am no pro but I never seen a tank fill up this quickly. There is an airtrol tank fitting on the tank but no air seperator to keep air in the tank. This is just some more information the tapping for the supply piping is reduced from 4 to 2 inch black iron and it is 2 utica J- 300B1 boilers tied together for the one supply. Doesn't that just cut the capacity by not using the tapped size. There are a couple automatic air vents on the return in the boiler room some of them work but there are only two bleeders for the radiators which depending on the time of day are impossible to get to.. This is a dorm style housing building that this boiler serves. The system pressure is 20 psig and they have been in for 11 years and according to the maintenance personel it has always been like this since day one. Any help would be appreciated. Thank you.
  • Tom_121
    Tom_121 Member Posts: 4

    compression tank large enough for the system
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