Filling Material; Excavation Pit; Tryouts Before Assembly; Installation - Kessel NS 3 Installation And Operating Instructions Manual

5.2 Filling material

Subbase: Round grain gravel (max. graining 0/16)
Tank base: Sand
Tank encasing: Round grain gravel (max. graining 0/16)
Area outside tank encasing: Material of suitable consistence
Top layer: Topsoil or similar

5.3 Excavation pit

Prerequisites for the ground to be used
The foundation soil must guarantee sufficient load-bearing ca-
pacity According to ATV-DVWK-A 127, the separator system
may only be installed in soils of
- Group G1 or G2 or
- Group G3 or G4 compacted with at least Dpr = 97%, whereby
in this case provision must be made for the sufficient drainage
of seeping water.
Preparation of the excavation pit
The foundation soil must be horizontal and level so that full-
surface set-up is possible. Compacted gravel 0/16 (at least 30
cm deep, Dpr=97%) must be planned as the subbase, and
must be compacted layer by layer with a maximum layer thickn-
ess of 30 cm/layer. 3-10 cm sand are required for the bed,
compacted to Dpr=97%. The clearance between excavation
pit wall and tank must be at least 50 cm. The requirements of
DIN 4124 must be fulfilled with regard to the slope angle. The
depth of the excavation pit must be dimensioned in such a way
that the limits of soil cover are not exceeded.
MIN ≤ DSC ≤ MAX (see "Dimensional drawing" chapter).
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 separator in sloped terrain, care must al-
ways be taken that the laterally thrusting soil pressure of distur-
bed ground is absorbed by a correspondingly designed retai-
ning wall.
5. Installation and assembly
35
6
4
≥50cm
5
b nach
1
DIN 4124
≥70cm
Subbase Gravel 0/16 compacted with Dpr ≥ 97%
Tank bed Sand compacted with Dpr ≥ 97%
Separator According to static calculation
Backfilling Gravel 0/16 compacted with Dpr ≥ 97%
Foundation soil G1 or G2 according to ATV-DVWK-A 127 or G3 or G4 according
to ATV-DVWK-A 127 compacted with Dpr ≥ 95%, whereby in
this case provision must be made for the sufficient drainage of
Top layer
seepage water
For Group E4 (HGV 60) load distribution plate according to static
calculations.
Top of the tank
For Group E2 (passenger cars) load distributionlayer
Frost-free depth for use all year round
When installing the separator it is imperative to pay attention 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 authorities,
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 follo-
wing:
- 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.
Cistern design:
Installation in the groundwater is possible providing the gro-
undwater level does not exceed the top edge of the tank ➆.
Inspection chamber design:
Handles groundwater depths up to 500 mm, measured from
the lower edge of the inspection chamber.

5.5 Installation

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").
≥50cm
3
2
≥70cm
≥
3-10cm
≥30cm