31
Inserting and connecting the tank
The tank must be inserted into the prepared excavation pit, ali-
gned opposite the designated drainage pipe, levelled and
connected permanently watertight to the drainage pipes.
Backfilling of the excavation pit and filling the tank
The excavation pit should be backfilled with gravel 0/16, which
must be compacted to Dpr=97% in layers of max. 30 cm/layer
using a light compactor. Parallel to this, the tank must be filled
with water to such an extent that there is a maximum difference
of 30 cm between the level of the liquid in the tank and the
filling material.
Root ingrowth
If installed near trees, shrubs and bushes, root ingrowth has to
be safely prevented.
Installation in terrain with a sloping location
When installing the grease separator in sloped terrain, care
must always be taken that the laterally thrusting soil pressure
of disturbed ground is absorbed by a correspondingly designed
retaining wall.
Frost-free depth for use all year round
When installing the grease separator it is imperative to pay at-
tention to the locally determined frost-free depth. To guarantee
problem-free operation in winter, too, the inlet and outlet pipes
must also be routed at a frost-free depth when the rainwater
storage tank is installed. Unless otherwise specified by the aut-
horities, the frost-free depth is usually approx. 80 cm.
5.4 Tests before installation
Immediately before placing the tank into the excavation pit, the
technical expert of the company that has been commissioned to
carry out the installation has to check and certify the following:
- The sound condition of the tank wall;
- The proper condition of the excavation pit with a view to its
dimensions and base bedding;
- Consistence of the filling material graining.
Installation in the groundwater is possible providing the gro-
undwater level does not exceed the top edge of the tank
➆
.
5.5 Installation
Please note: Weather-related influences or cooling of the tanks
during the installation phase (caused by filling with cold water)
can lead to deviations in dimensions from the catalogue speci-
fications in the case of cisterns, separators installed in the gro-
und and septic systems. For this reason, please check the
height specifications in particular for their actual size before in-
stallation.
Placement
The tanks must be placed without impact into the excavation
pit with the aid of suitable equipment and set down onto the
base bedding (see also chapter “Transport”).
Filling of tank and backfilling of excavation pit
To avoid deformation of the tank, filling of the tank with water
and backfilling of the excavation pit must be carried out in par-
allel.
The tank encasing must be manufactured in a width of at least
50 cm. The individual layers should not exceed a height of 30
cm. They must be compacted using light compacting equip-
ment (minimum Dpr=97%). Damage to the tank wall and a dis-
location of the tanks during and after installation must be ruled
out. The automatically closing pipe end piece remains closed
during the entire filling process.
Tank connection
Any transportation safety devices must be removed. Make sure
that the connection pipe sections are protected from damage
to guarantee permanent watertightness. In order to confirm
correct installation, a watertightness test must be carried out
and documented before the base course is prepared. To make
connection easier, the connection sections and counter-pieces
must be sufficiently greased.
The transition from downpipes to horizontal pipes must be exe-
cuted with two 45° curved fittings and a connecting piece at
least 250 mm long. A stilling section must be provided before
the separator system, the length of which
must be at least 10 times the nominal size of the inlet pipe.
Depending on the installation situation, a load distribution layer
that is capable of bearing a sufficient load must be prepared:
- For Group E2 to standard roadbuilding regulations acc. to
annex 3 and 4
- For Group E4 with a load distribution plate acc. to annex 5
and 6
Connecting the sampling chamber
Sampling devices must be located directly downstream of the
separator in the direction of flow. The sampling device in the
separator system must be freely accessible and arranged so
that only wastewater that has passed through the separator sy-
stem can be removed.
Ventilation
In accordance with DIN EN 1825-2, grease separator systems
and their inlet and outlet pipes must be sufficiently ventilated
and vented. This means the inlet pipe must be routed to above
the roof as a ventilation pipe. All connection pipes longer than
5 m must be vented separately. If the inlet pipe is longer than
10 m and there is no separately ventilated connection pipe
available, the inlet pipe must be equipped with an additional
ventilation pipe near the separator.
Lip seal DN 600
must be inserted in the bore hole in the dome and greased.
Check the sealing faces for cleanness and damage before in-
stallation.
5. Installation and assembly
