Grundfos Multilift MSS Instrucciones De Instalación Y Funcionamiento página 19

6.2 Guidelines for installation of lifting station
Guidelines for correct mechanical installation of lifting
station according to EN 12056-4
See section 6.1.1 Installation sketch.
• Install the lifting station in a properly lit and vented room with
60 cm free space around all parts to be serviced and operated.
• Provide a pump sump below the floor level. If a lifting station is
installed in a basement with the risk of penetrating
groundwater, it is advisable (in certain countries required) to
install a drainage pump in a separate pump sump below floor
level in order to drain the room. See fig. 10.
The collecting tank, pump and cables may be
Note
flooded (max. 2 m for 7 days).
The controller must be installed in a dry and well
Caution
ventilated place.
• All pipe connections must be flexible to reduce resonance.
• Lifting stations must be secured against uplift and twist.
• All discharge pipes (lifting station, diaphragm pump and
drainage pump) must have a loop above the local backwater
level. The highest point of the goose neck/reversed water seal
must be above street level.
• For discharge pipes, DN 80 and upwards, install an isolating
valve in the discharge pipe. Also provide an isolating valve in
the inlet line.
• Surface water must not be discharged into the lifting station
inside the building. It should have its own pumping station
outside the building.
• Lifting stations must be provided with an approved non-return
valve according to EN 12050-4.
• The volume of the discharge pipe above the non-return-valve
up to the backwater level must be smaller than the effective
tank volume.
• In general, a lifting station for black wastewater must be
vented above roof level. However, it is permitted to lead the
ventilation, as a secondary ventilation, into the main building
ventilation system.
• If the wastewater is discharged into a collecting line, this
collecting line must have a filling ratio of at least h/d = 0.7.
The collecting line must be at least one nominal diameter
bigger after the discharge pipe connection.
• Use a diaphragm pump for simple, manual draining of the
collecting tank in case of pump failure (not obligatory).
6.3 Recommended steps for mechanical installation of
lifting station
1. Checking the scope of delivery. For scope of delivery, see
section 2. Scope of delivery.
2. Preparing the inlets by cutting out the required holes. Use cup
drills ∅100 for DN 100 and ∅43 for DN 50 inlets. The cutting
line is recessed. To avoid sharp cutting edges, the holes must
be deburred. The socket seals are provided with collars.
3. Preparing the connection for diaphragm pump (optional). Use
cup drill, ∅43, for DN 50 connection socket. To avoid sharp
cutting edges, the hole must be deburred.
DN 50 - ∅43
DN 100 - ∅100
DN 150 - ∅150
Fig. 11 Cutting or drilling of connection holes
4. Connecting the inlet pipe to the tank. Install an isolating valve
between inlet pipe and lifting station to avoid inflow during
maintenance and service. We recommend an easy-to-handle
PVC isolating valve.
Fig. 12 Installation of isolating valve
Make sure that weight from inlet, discharge and
Caution
vent pipes does not rest on the tank. Long pipe
sections, valves, etc. must be supported.
Warning
Never step on the lifting station.
5. Connecting the discharge pipe.
Install an isolating valve between the non-return valve and the
supplied flexible connection hose, DN 100 (internal diameter
110 mm). A flexible connection can be ensured if a distance of
approx. 5 cm is left between the pipe ends of the inlet,
discharge and vent pipes and the ports of the lifting station.
19