English (GB)
7
3.1.4 Dry installation
In dry installations, the pump must be installed
permanently outside the pit.
The motor is totally enclosed and watertight.
Consequently, it will not be damaged in case the
installation site is flooded.
Precautions
• As the pump is installed outside the pit, make
sure that the liquid level in the pit is high enough
to ensure sufficient NPSH.
• Size the inlet line according to the length and the
desired pump performance. A possible difference
in level between the pit and the pump inlet must
also be taken into account.
• Support the pipes so that no strain or other
mechanical influences are transmitted to the
pump. We recommend that you install expansion
joints and pipe hangers. See fig. 3.
Fig. 3 Horizontal dry installation with brackets
• If a reducer is fitted between the inlet line and the
pump, it must be of the eccentric type. The
reducer must be fitted so that the straight edge is
upwards to avoid air pockets in the inlet line. Air
in the inlet line may cause cavitation. See fig. 3.
• Install the pump on a separate foundation, for
instance a concrete foundation. The weight of the
foundation must be approx. 1.5 times the weight
of the pump. To prevent vibrations from being
transmitted to the building and pipes, we
recommend that you place the pump on vibration
absorbing material.
Fig. 4 Vertical dry installation on a base stand
Fig. 5 Horizontal dry installation with brackets
TM02 8399 5103
Pos. Description
1 Expansion joint
2 Non-return valve
3 Isolating valve
4 Pipe hanger
TM02 8401 0616
TM02 8402 0616
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