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DEHOUST GMBH – GUTENBERGSTR. 5-7 – D-69181 LEIMEN – www.dehoust.com
To avoid unpleasant odours from the sewage drain, a siphon is fitted as standard to the process water storage tank
The drain connection or pump system must be able to securely drain the maximum mains water feed volume
(see 3.2).
Make sure the overflow line to the sewer/pumping system has the same nominal width as the emergency overflow
connection (no cross-section constriction!)
If the overflow connection is not connected to the drain, there is a risk that the installation room
may overflow.
Figure 6: Connection of the overflow connection
5.5.
Emergency overflow vent
type AB
If a backflow occurs, due to a drain blockage/defect of the pumping station, extending into the process water storage tank of the
break tank system
, the water is drained through the tank’s side emergency overflow vent into the installation room. This free
overflow is required to protect the mains water back-up line in accordance with DIN EN 1717.
The installation room must have a suitable floor drain/sump to securely drain away the overflowing water in case
of backflooding over the drinking water feed of the process water storage tank.
Figure 7: type AB side emergency overflow vent
Connection of the overflow
connection
DN 70 to sewer/pumping system
Type AB side emergency overflow
vent
