Switch off the pump and let water out of the tank at nearest tap (preferably the drain tap on tank) When pressure is at zero on water gauge, measure the pressure on the nipple on tank top. It should read above 28 psi on most systems, if so your bladder is good. If pressure at that nipple is very low, or zero, then your bladder is shot. - In theory, any bladder can be changed (and I have done many) -but unless the tank is a large one (over 90 gallons) then it is not economical.
If tank has rusted through, tank will leak. If bladder goes bad, tank should not leak.
If the bladder is bad in your expansion tank the tank will fill with water. When this happens the pressure in your furnace will exceed 30lbs and your pressure relief valve will blow off.
The bladder.
In this case the only proper thing is to get a new bladder tank.
If on a well, check filter coming into house. It will drop pressure if clogged really badly. Change filter, also small blue bladder tank may be bad. Tube inside tank busted. If tank is bad you will need to replace bladder tank. When this rubber tube inside tank burst it causes tank to fill completely fill with water and becomes water logged. The last thing it could be but unlikely is foot valve going bad in well.
If it's a galvanized tank, it would be leaking. If it's a bladder tank, it will not have any air pressure in it and there may be water coming out of the valve stem. It will also be very heavy. bob...
The "bladder" in a bladder water tank is typically made using a durable, puncture resistant fabric that is made to withstand pressure and prevent the pillow from popping.
bleed the air tank by pushing down on the air stem, remove the pressure from the water tank,add correct amount of air to bladder, then start pump.
Depends on what you consider better? If a bladder fails you need to rush out and get a new one if a galvanized tank gets floooded you can drain it and your back in business
I would be curious to know the answer to this question also so I hope someone who knows something about the subject answers soon.
if its a bladder type tank, it will need to be replaced
Water bladder tanks are tanks which contain a rubber bladder that is filled with either water or air. The majority of water bladder tanks have water-filled bladders. When a water faucet is turned on or a toilet is flushed, the water is piped in from the water tank. As the water pressure and air pressure get low, the contacts on the pressure switch click together. The pressure switch sends an electrical current to the water pump which causes the water pump to kick on and pipe water back into the water bladder tank. The amount of time it takes for the pressure switch to click on depends upon the size of the water bladder tank. The larger the water bladder tank, the longer it will be before the pressure switch starts to deliver electrical current to the water pump. Read more: How Does a Water Bladder Tank Work? | eHow.com http://www.ehow.com/how-does_5001805_water-bladder-tank-work.html#ixzz2A9TeSAnX found this on www.ehow.com