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en – Original Instructions
6.3 Guidelines for hydraulic connection
Refer to the hydraulic and wiring diagrams.
6.3.1 General guidelines
1. Support the piping system independently to prevent them from weighing on the pump set.
2. Install the complete piping system.
3. To reduce flow resistance, the suction pipe system must be:
4. Make sure that air cannot enter the piping system through the suction vortex: if necessary,
5. Install the diaphragm tanks, making sure that the nominal pressure is higher than the
6.3.2 Suction lift installation
1. Install the suction pipe ensuring a 2% increasing slope towards the upper pump set to
2. Install a priming tank kit for each pump.
3. Connect the tank to an automatic filling system.
4. In the tank make sure to install:
5. Connect the float switch to the control panel.
The figure shows an example of suction lift installation with accessories. Also see Accessories
on page 105.
2
Pressure delivered by the pump + suction pressure
88
• As short and as straight as possible
• For the section connected to the pump set, straight and without bottlenecks, covering a
length equal to at least six times the diameter of the suction port
• Wider than the suction port; if necessary, install an eccentric reducer;
with horizontal top surface
sized to ensure a max. water flow speed of 1.5 m/s (5 ft/s) in the suction lift system
and 1.8 m/s (6 ft/s) in the positive suction head system
• Devoid of:
Bends (if this cannot be avoided, make sure that their radius is as wide as possible)
Trapped distribution pipes
Goose necks
• With valves with a low specific flow resistance.
fit a vortex protection device.
maximum pressure that can be reached by the system
prevent air pockets.
• The overflow pipe
• The float switch
• The minimum pump flow line
2
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GEM, GEMJ – Fire-fighting Pump Set
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