SINGLE DIAPHRAGM PRESSURE TANK - PTB 160

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.
An important thing to remember,
 the higher the operating pressure – 
the larger the tank must be.
 

Pressure and tank size have a direct correlation 
– as one increases, so does the other.
The disadvantage may be the need to 
check the overpressure in the vessel regularly,
 due to the possibility of air leakage. 
In the event of a leak, the air in the vessel would be reduced
, which would switch the pump more often and more 
water would flow into the bladder. 
This would create a risk of the bladder tearing.