Old Boiler Expansion Tank

If youre considering converting an old non captive type expansion tank to a captive air expansion tank an easy rule of thumb is to replace the existing tank with the model that is equal to the existing tanks volume.

Old boiler expansion tank.

Pressure and air vents. Steel expansion tanks still exist today although many newer hot water boiler systems use the bladder type expansion tank. In a steel expansion tank the air and the water touch each other. In that it has to be drained as part of a maintenance scheduled.

All components are original with system. We end up with an expansion tank empty of water and filled with air at atmospheric pressure which technically is 14 psi 1 atm but in a practical sense is zero psi with respect to the boiler. The tank will work fine until it rusts out provided that it is maintained. Finned copper baseboard convectors unit heaters cast iron radiators or cast iron heating baseboards and the heat output of the heating boiler in 1000s of btus hour or output btuh.

A description of how the old style expansion tank provides a cushion for expanding water in a hot water boiler system. Old expansion tank i have a customer with an old in the ceiling expansion tank on his peerless boiler. Then the expansion tank drain is opened. Additionally while in a bladder type the air and the water stays separated by a diaphragm.

Steam boilers are simpler systems that lack several components found in hot water boiler systems such as the circulating pump expansion tank and regulators for water pressure and temperature. I opened up the drain valve till water stopped flowing then turned the water feeder back on. An expansion tank is not found in steam boiler systems which create heat by circulating hot vapor rather than hot water through the pipes and radiators. Steam boiler with attic expansion tank central heating systems and open vented how to fix rising boiler pressure expansion tanks star tribune bi boiler pressure faults old expansion tank draining heating help the wallexpansion tank dos and don ts hpacinternal tankless water heater a close look cubby oilour boiler has a pin whole in tank read more.

Other than that the old non diaphragm type of boiler expansion tank is fine. Most of these old tanks use a special expansion tank drain valve that lets air into the tank as water drains out. The relief valve was just changed i m not familiar with this type of tank.