Insertion And Filling; Routing Connections - Graf CARAT XXL Serie Instrucciones Para Montaje Y Mantenimiento

5.2.4 Connection of several tanks
Two or more tanks are connected via the assem-
bly surfaces by means of GRAF special seals
DN 100 and basic pipes (to be provided at con-
struction site).
The apertures must be drilled to the correspond-
ing 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.
5.3

Insertion and filling

The tanks must be inserted, impact-free, into the
prepared trench using suitable equipment. The
tank is filled with approx. 25 cm water before filling
the tank surround.
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 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 de-
cline 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.
5. Installation and assembly
compaction. Mechanical
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