Expansion Tank Location

Ron Schroeder_3

to carry a small copper line from the ideal connectiong place to where you can fit the tank? This strategy should achieve what you want it to.

Mike Trzcinski

Expansion Tank Location

Typical piping diagrams show an air separator/expansion tank on the outlet of the boiler (the suction side of the pump). I realize that the air separator should be located at the point of lowest solubility in the system (where the temperature is the highest), however, the system that I am working on does not have sufficeint room to install an air separator/expansion tank on the supply side of the boiler. Does anyone see a problem installing the expansion tank/separator on the return piping adjacent to the boiler? (Note: The supply water enters a header with 7 circulators, one for each zone)

Mike20

Air And exp tank

An expansion tank can go any where on a hot water heating system since the pressure has to do with the expansion and contraction of water. Therefore the pressure exerted is equal in the entire system and may be compensated for anywhere within the closed loop of the system.
An air separator can be eliminated by compensating for air with automatic air vents at the highest points in each of the heating zones.
Good luck
MG


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Mike20

Air And exp tank

An expansion tank can go any where on a hot water heating system since the pressure has to do with the expansion and contraction of water. Therefore the pressure exerted is equal in the entire system and may be compensated for anywhere within the closed loop of the system.
An air separator can be eliminated by compensating for air with automatic air vents at the highest points in each of the heating zones.
Good luck
MG


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hr

Physically

the tank can mount anywhere. We remote mount and pipe to them with pex or PAP sometimes. It's best to always pump away from them, so in the case of a high pressure drop boiler, like most condensing boilers are, the tank ends up on the return side of the primary loop. Of course the fill valve needs to be at the PONPC. Most critical when high head pumps are used on these boilers also.

Air removal is best at the highest temperature location, but I have used Spirovents on the return side without problems. I don't think I would use a cast type scoop on the return, Spiros or any micro bubble type will capture air better. Even on the return.

The air purger and expansion tank need not be in the same location. As equipment needs change, so does the location of these components.

hot rod

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