expansion tank with bladder

pj92

want to change old compression tank in the ceiling with a watts bladder expansion tank
just unsure of location.
its a series loop hot water system with slant fin radiation. can it be put off the air separtor from the same line going
to the compression tank.

SWEI

Generally yes, but the air separator might need to be changed out for an air eliminator. You should also make sure the circulator pump(s) are pumping away from the tank.

If you post some photos of the boiler along with associated pumps and piping, we may be able to offer more specific advice.

Ironman

pj92 said:

want to change old compression tank in the ceiling with a watts bladder expansion tank
just unsure of location.
its a series loop hot water system with slant fin radiation. can it be put off the air separtor from the same line going
to the compression tank.

There should NOT have been any air separation device with an open compression tank - the tank IS the air removal device. Putting an air separator on in conjunction with the old tank would cause it to become water-logged.
Now, If you install a bladder tank, an air separation device (MBR) must be installed.
Like SWEI said, some pics would be helpful.

hot_rod

Air elimination if an Airtrol™ type device is use, this puts the air back up to the tank.

The bladder or diaphragm tank will be sized much smaller, compared to the compression tank.

A pic or drawing would help determine how the current tank is piped.

Ironman

hot rod said:

Air elimination if an Airtrol™ type device is use, this puts the air back up to the tank.

The bladder or diaphragm tank will be sized much smaller, compared to the compression tank.

A pic or drawing would help determine how the current tank is piped.

It's been a good while since I've seen one of those - even with all of the older systems around here.