Installing The Pumping Station, Underground - SFA SANIFOS 110 Notice D'installation

UK

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.
RISK OF FREEZING
It is important to install the pumping station when it is not freezing.
Frost damage may result in damage to the piping and pump.
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
and SANIFOS 500.
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• The characteristics shown on the rating plate have been compared with those on the order and installation (supply voltage, 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 and valves are not supplied.
Note:
• The pumping station must be ventilated.
• The pumped fluid is appropriate and authorised by this documentation.
(see section 3.9, page 5)
• In case of discharge of greasy effluents, the use of a degreasing tank 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.
• Position the fitted pumping station in place in the pit.
• Fill in the perimeter of the station with a mixture of sand and gravel. Balance the backfill pressure to avoid deformation of the tank by filling
it with clear water.
• Connect the water inlet and ventilation discharge pipes.
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