Xylem RJ Enduro Tank IOM 3 languages Tri-lingual - Manual (Page 3)

3
The water systems
tank
concept
The water system tank does more than simply
store water. It helps to protect the system
components. A properly sized tank will provide
adequate flow even when the pump is not
running. It saves energy by reducing the
number of pump starts. Another benefit is
increased system component life due to fewer
pump cycles.
The water system tank consists of a steel tank
(A) containing a sealed-in-place heavy duty
diaphragm (B) which separates air from the
water. The portion of the tank where water is
stored (C) is lined to isolate water from the
metal tank. This protects the tank from
corrosion.
Here’s how the
tank works for a
water system
designed to
operate at a
30/50 psig
pressure
switch
setting.
Prior to shipping, the tank
is pressurized to a standard
precharge as defined in
“OPERATION” part of this
manual. As water enters the tank, the
air above the diaphragm is
compressed and its volume
is reduced by the volume of
water that enters.
The pressure in the tank
rises. Water continues to
enter until the pump cut-out
pressure is reached. The
pump shuts off and the tank
is now filled. The pressure in the air chamber
forces water into the system
when a demand is made
without causing the pump to
operate immediately. When
the pressure in the chamber
finally drops to the pump cut-
in pressure, the pump switch
activates the pump and
repeats the filling cycle.
1. 2.
3. 4.
AIR WATER
30 40
50 45