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• The discharge line must be designed to prevent any back-flow of sewage.
By fitting a non-return loop, located above the back-flow level, back-flow is avoided.
Please note: Unless otherwise specified locally, the back-flow level is the level of the highway (roads, pavement, etc.).
Extend this line after the non-return loop through a larger diameter pipe.
• Provide a sump to drain the room.
• The installation of an auxiliary pump for possible drainage of the plant room (for floods) is recommended.
• The pumping station must be ventilated above the roof.
• The pumped fluid is appropriate and authorised by this documentation (refer to the pump's user manual).
• In case of discharge of greasy effluents, the use of a degrease tap is essential.
Wastewater other than those mentioned above, for example, of artisanal or industrial origin, must not be discharged into
the pipes without prior treatment.
5.2 INSTALLING THE PUMPING STATION, UNDERGROUND
Before burying the pumping station, a soil analysis must be carried out. This analysis must comply with DTU 64-1 and the
Order of 6 May 1996.
NOTICE
Risk of freezing.
Frost damage may result in damage to the piping and pump.
It is important to install the pumping station frost-free.
It is important to take into account the regional freezing depth.
When the pumping station is installed in an environment where temperatures are below zero, it must be
insulated in accordance with local recommendations.
The risk of frost can be limited by burying the station deeper; as accessories, SFA offers 30 cm extensions
for Sanifos® 280, 40 cm extensions for Sanifos® 610 and Sanifos® 1300.
• The characteristics shown on the rating plate have been compared with those on the order and installation (supply vol-
tage, frequency).
• The work has been prepared in accordance with the dimensions shown in the example installation and standard EN 752.
• Stop valves (provided with certain devices) must be fitted on the effluent inlets as well as on the discharge line, as close
as possible to the pumping station.
Note: External valves are not supplied.
Important:
• The pumping station must be ventilated.
• The pumped fluid is appropriate and authorised by this documentation (refer to the pump's user manual)..
• In case of discharge of greasy effluents, the use of a degrease tap is essential.
Wastewater other than those mentioned above, for example, of artisanal or industrial origin, must not be discharged into
the pipes without prior treatment.
The pumping station purchasing adviser and the installation company must have a perfect knowledge of the nature of the
soil, of any presence of ground water, in order to define the civil engineering of their project, and therefore how the tank
will be buried.
How are SANIFOS tanks buried underground?
• Choose a suitable location for the station's installation. In principle it should be installed at a lower floor height than the
drained elements to allow a drop of the elements(s) in the station.
• Check there are no underground communal cables, conduits or pipes.
• Hollow out the pit.
– The bottom of the pit must be flat and horizontal.
– The depth of the pit must allow a slope of between 1 and 3% for the wastewater pipes entering the station.
• The excavation should be at most 500 mm deeper than the depth or overall length of the tank. If the excavation is done
by hand, the sides should be propped to prevent any landslip.
• A clean ballast should be spread out and secured at the bottom of the excavation. It should be about 200 mm thick.
• If the bottom of the pit is made of concrete, attach the tank to the ground by its anchor points.
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