Insertion And Filling; Routing Connections - GRAFF CARAT XL Mode D'emploi

5.2.4 Connection of several tanks
Two or more tanks are connected via the assembly
surfaces by means of GRAF special seals DN 100
and basic pipes (to be provided at construction site).
The apertures must be drilled to the corresponding
size using only the GRAF special crown bit. It must be
ensured that the distance between the tanks is at
least 600 mm. The pipes must project 100 mm -
150 mm into the tanks.
Please note that the lower openings of the tanks (10.000L) are offset to the side, not in the middle.
Attention must therefore be paid even when positioning the tanks that the openings are located so
as to correspond with one another.
5.3

Insertion and filling

The tanks must be inserted, impact-free, into the
prepared trench using suitable equipment. To avoid
deformities, the tank is filled approx. 25 cm with water
before filling in the tank surrounding.
Afterwards the surrounding (roundgrain gravel, max.
grain size 8/16) is then filled in layers of max. 40 cm
steps and is compacted.
The individual layers must be well-compacted (manuel
tamper). Damage to the tank must be avoided during
compaction. Mechanical compaction machines must not
be used under any circumstances. The surrounding
must be at least 500 mm wide.
5.4

Routing connections

All feed and overflow pipes must be routed with a
decline of at least 1% in the direction of flow (possible,
subsequent settling must be taken into consideration in
this case). If the tank overflow is connected to a public
sewer, this must be protected against reflux by means
of a lifting station (mixed sewer) or reflux seal (pure
rainwater sewer) according to DIN 1986.
All suction, pressure and control lines must be routed
in an empty pipe, which must be routed as straight as
possible, without bending, to the tank with a decline.
Necessary bends must be formed using 30° moulded
sections.
Important: The empty pipe must be connected to an
aperture above the max. water level.
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5. Installation and assembly
18 / 50
25 cm