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-   -   expansion tank (http://www.diychatroom.com/f7/expansion-tank-26582/)

econdave 09-10-2008 06:31 AM

expansion tank
 
when i check the pressure in tank, with a tire pressure gauge, water shoots out. can i shut the main, unscrew tank and pump it to the psi it needs to be at?

TazinCR 09-10-2008 06:42 AM

Your tank is water logged. Meaning the bladder is leaking. Are you talking a water storage tank or expansion tank on a water heater? You can just pump air into the tank no need to remove. If you did remove you could not charge it because the bladder has a hole in it.
When a tank for your pump gets water logged as soon as you turn the water on your pump turns on and off .on and off. You have no draw down is what it is called. If you just add air you will have to do it maybe once a month. Get a new tank would be the best choice.

econdave 09-10-2008 07:25 AM

the expansion tank is before the water heater, i am on town water. The bladder must have a hole right? If i take the tank off and try to put air in it i should hear it leak or it just wont hold pressure. The problem i have is every now and then I get water on the floor from the water heater spouting out the pressure relief valve.?

TazinCR 09-10-2008 08:11 AM

I would just replace the tank. If it has water in it the bladder is bad. It being water logged is why your T/P valve is opening. Water can not be compressed.

econdave 09-10-2008 07:19 PM

what is a T.P. valve

micromind 09-10-2008 08:47 PM

T/P valve. Temperature/Pressure relief valve.

Every water heater has one, if it doesn't, and the heat source (gas or electric) doesn't turn off when it's supposed to, eventually the tank will rupture. The problem here is that the water is now superheated, meaning it is above boiling point, but isn't boiling because it's under pressure.

When the tank ruptures, the pressure is suddenly released, and the water instantly turns to steam. Instantly....as in explosively.

The net result is a partially, if not completely destroyed building.

The pressure part of the valve is self-resetting, the temperature part is not.

Rob


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