FLOWTECH flowboost G.V Operation And Maintenance Manual page 9

Pressure tank
A diaphragm pressure tank is used on the discharge side of the pump to maintain pressure in the pipes
when there is no water demand. The unit stops the pump from continuing to run at zero demand and reduce
the size of the tank that is required for supply purposes.
The tank must be permitted and suitable for systems pressure.
Tank selection
Variable speed pressure booster sets can operate with smaller tanks compared to traditional systems. As a
rule, a tank with a capacity in liters amounting to about 10% of the flow rate of a single pump expressed in
liters per minute is sufficient. The required water volume may be distributed among multiple tanks.
Product function and use
In its standard version, the product is a booster unit set which consists of identical variable speed electric
pumps that are connected in parallel. The pumps are mounted on a common stand, suction and delivery
manifolds, on-off valves, non-return valves, pressure gauge, pressure transmitters, and a single-phase or three-
phase control panel.
The system must be equipped with a membrane tank. The delivery manifold is fitted with couplings that
are designed for the installation of 24 L tanks with an on-off valve. Along with the tanks, provide a applicable
manifold support.
Extra floor-standing tanks may be installed and connected to the manifold. Intended use
The product can be used to pump:
Cold water
Refer to the standard Installation, Operation and Maintenance Manual for pump design specification. The
variable speed booster sets are made for the following applications:
Default, pressure regulation (open loop systems)
Level and flow regulation (open loop systems)
Irrigation applications with single or multiple pumps. Improper use
The product must not be used for closed loop systems.
Applications
The application alternatives for the product are the following:
Actuator (constant speed)
The unit operates as an actuator according to speed set point; this is done through user interface, the
corresponding analog input or the communication bus.
Controller (constant pressure)
This mode is set as the default operating mode and is used for a unit in a single pump operation.
Cascade serial / Cascade synchronous
The units are connected via the RS485 interface and communicate via the provided protocol.
The combination of the different units which are used in a multi-pump system depends on the system
requirements.
It is possible to run all pumps in cascade serial mode and cascade synchronous mode as well. If one unit fails,
then each pump of the system can become the lead pump and can take control.
This mode is set as the default operating mode and is used for a booster set unit in a multipump operation.
Cascade serial mode is the standard configuration.
flowboost
G.V Pump Manual
9