Table of Contents
Advertisement
4.2.3 Connecting the outlet pipe
Observe the following when connecting the outlet
pipe:
•
All pipe connections must be flexible to reduce
resonance.
Make sure that the weight from the inlet,
outlet and vent pipes does not rest on the
tank. Long pipe sections and valves must
be supported.
•
To avoid sediment buildup in the outlet pipe, the
pipe must be sized for a minimum flow velocity of
0.7 m/s.
Nominal diameter of
pipe
Flow velocity: 0.7 m/s
•
The collecting line must have a filling ratio of at
least h/d equal to 0.7.
•
The collecting line must be at least one nominal
diameter larger after the outlet pipe connection.
•
Do not taper off the outlet pipe in the flow
direction.
•
Lifting stations must be provided with an approved
non-return valve according to EN 12050-4.
•
The volume of the outlet pipe above the non-
return valve up to the backflow level must be
smaller than the effective tank volume.
•
Install an isolating valve in outlet pipes of DN 80
and up.
Do as follows:
1. Connect the outlet pipe to a breeches pipe.
If you do not install a breeches pipe, make
alternative pipework to connect an outlet pipe.
2. Lead the outlet pipe to the collecting line and
connect these two.
The outlet pipe must have a bend above the
backflow level which is often the street level. Ask
local authorities.
Related information
4.2.1 Installing the pumps
14
80 mm
100 mm
3.6 l/s
5.6 l/s
4.2.4 Connecting the vent pipe
All pipe connections must be flexible to reduce
resonance.
Lifting stations for black wastewater must be vented
above roof level. However, you may connect the
ventilation, as a secondary ventilation, to the main
building ventilation system. Place special vent valves
outside the building. Special vent valves are available
as accessories.
Make sure that the weight from the inlet,
outlet and vent pipes does not rest on the
tank. Long pipe sections and valves must
be supported.
1. Cut off the blanked-off end of the vent port on top
of the tank.
2. Fit a DN 70, external Ø75, vent pipe to the vent
port by means of the flexible connection piece and
two hose clamps.
3. Lead the vent pipe into the main building
ventilation system in accordance with local
regulations.
Advertisement
Table of Contents
