Diaphragm tanks are commonly used on the discharge manifold to provide water storage for the system in very low flow situations. It decreases the running time of the booster pumps, thereby making the system more energy effective.An advantage of bladder pressure tanks is that they typically last longer than diaphragm pressure tanks, since they don't have a diaphragm that can fail.
Diaphragm pressure tanks are the most efficient type of pressure tank and require the least amount of maintenance due to the use of a rubber lining inside that separates the air and the water. This rubber lining acts as the bladder would, but its connection is permanent to the tank.
Therefore, it is not replaceable.If this happens, there is little air left in the tank to become compressed, so the pump runs nearly every time water is used. In addition, too much air in the tank is a problem because it reduces the space for water storage. Extra air must be released or the tank will become air-bound.
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