Laying The Connecting Pipelines; Installing The Shaft Extension And Covering - 4rain FLAT Notice D'installation Et D'entretien

5.4

Laying the connecting pipelines

All supply lines and overflow lines must have a gra-
dient of at least 1 % in the flow direction (possible
down-line settling must be considered).
Prior to completion of the backfilling verify that the
pre-installed overflow bend inside the tank is point-
ing upwards.
If the tank overflow is connected to a public canal
this must be secured against backpressure in ac-
cordance with DIN 1986 by means of a pump station
(combined sewer) or a backflow stopper (pure rain-
water canal).
All intake, pressure and control lines must be led
through an empty conduit installed with a slope to-
wards the tank, without sagging and as well as pos-
sible along a straight line. Pipe elbows required must
be with 30° fittings.
Important: Connect the empty conduit to an open-
ing above the maximum water level.
6.

Cover

Shaft extension

Seal

FLAT flat tank
The shaft extension can be shortened at the grooves. This allows earth coverage from 400 to 780 mm
above the tank shoulder.
To mount the shaft extension

seal supplied . It is not necessary to attach the extension, as the shaft is held in position by the sur-
rounding soil after filling in the installation pit.
Then set on the cover
cover firmly enough so that a child cannot open them!
5. Installation and Assembly

Installing the Shaft Extension and Covering


set the extension loosely onto the tank opening

and close off with child protection. Tighten the screw connections on the
info@4rain.eu
www.4rain.eu
19 / 40

and then mount the