Guidelines For Hydraulic Installation - Xylem LOWARA SMB /SVE Series Installation, Operation And Maintenance Manual

Figure 9: Multi-pump system
1. e-SM pump unit with motor
2. Diaphragm pressure tank
3. Distribution panel

4.2.1 Guidelines for hydraulic installation

 Install the booster set according to the water flow rate of the system
 The arrows on the body of the pump unit indicate the flow and the rotation direction
 Install a foot check valve in case of a suction lift system
 Install an on-off valve immediately downstream of the booster set
 Install a drain valve for the tests if there is no valve next to the booster set
 The pipes connected to the booster set must be adequately sized (if possible, according to
 The size of the suction pipe and foot check valve must be such as to avoid excessive load
Diaphragm pressure tank
On the delivery side of the pump unit there is a membrane expansion vessel, which gives the
possibility of maintaining the pressure inside the piping when the booster set is not being used.
The diaphragm pressure tank stops the pump unit from continuing to run at zero demand and
reduces the size of the tank that is required for supply purposes.
Choose a diaphragm pressure tank suited to the pressure of the system.
Variable speed booster sets can operate with diaphragm pressure tanks of smaller sizes than
traditional systems. A diaphragm pressure tank with a capacity in litres equivalent to about 10%
the flow rate of a single pump unit, expressed in litres per minute. The volume of water required
can be distributed between several tanks.
manifold diameter). You can use either end of the manifold, but don't forget to plug the
unused end.
loss and the cavitation phenomena that can be caused as a result
4. On-off valve
5. Non-return valve
6. Low water control
en – Original instructions
7. Pressure gauge
8. Pressure sensor
9. Drain tap
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