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

5.2.4 Connection of several tanks
Two or more tanks are connected via the assembly
surfaces by means of GRAF special seals 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 at least 200 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 1/3 water before filling in the tank surrounding.
Afterwards the surrounding (roundgrain gravel, max.
grain size 8/16) is then filled in layers of max. 30 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
Sewer
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