Typically a double diaphragm
pump will be able to run continuously
at between 40 and 60 cycles per minute
and intermittently at much higher rates for short periods.
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.
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.
Diaphragm rupture: Causes of a
failed or ruptured diaphragm include overuse,
abrasion, chemical attack or overpressure to name a few.
A rupture means fluid will leak into the air valve and leak through the pump's muffler.