Signs of Expansion Vessel Failure
Identifying expansion vessel failure early is critical to preventing significant damage to your home's heating system. When a vessel loses its air charge, it can no longer absorb the thermal expansion of the water, leading to rapid pressure fluctuations and potential safety valve discharge.
Common indicators include frequent pressure relief valve dripping, inconsistent boiler heat, and the pressure gauge needle spiking into the red zone during operation. If you notice these symptoms, the internal diaphragm may have ruptured, necessitating a professional inspection from All Clear Plumbing.
Steps to Test Your Expansion Vessel
Testing your expansion vessel is a straightforward process that helps determine if the unit needs to be recharged or replaced entirely. By checking the air pressure via the Schrader valve, you can quickly verify if the vessel is holding its required charge.
To perform this test, isolate the boiler and drain the system pressure to zero before using a standard tire pressure gauge on the vessel's valve. If water escapes from the valve instead of air, the internal bladder has failed, and the vessel must be replaced to restore proper system equilibrium.
