39
Wavin AS+
Technical Manual
Air-circulation pipes
Air-circulation pipes are used to ventilate collecting connec-
tion pipes which require such ventilation under certain circum-
stances, due to the length, height difference or the number of
changes of direction; or for functional reasons.
Air-circulation pipes should have the same nominal diameter
as the collecting connection pipes that they ventilate, as
measured at the confluence with the downpipe. The cross-
section of the pipe up to the start of the ventilation system
should likewise be of this nominal diameter.
Bypass pipes
Bypass pipes are required under certain circumstances
for downpipe offsets or points of confluence between
downpipes and underground and collector pipes.
Please also refer to the section of this manual that
deals with downpipes.
Bypass pipes have the same nominal diameter as the
downpipe, but have a maximum diameter of DN 100.
The size of the ventilation section (the upper part of the
bypass pipe without waste water connection) can be
calculated using the following table.
Please note that this table is only a partial extract from
DIN EN 12056, Part 2.
It shows only the System I values (i.e. the ones relevant
to Germany)
Fig. 23: Air-circulation pipe.
Table 19: Extract from Table 7, DIN EN 12056-2.
Fig. 24: Bypass pipe conforming to DIN 1986-100.
Hydraulic capacity (Q
max
)
and nominal diameter (DN)
Q
max
(l/s)
Connection pipe / ventilation section (DN)
0.75
50/40
1.50
60/40
2.25
70/50
3.00
80/50**
3.40
90/60***
3.75
100/60
** not applicable to toilets
*** not more than 1 toilet
Min.
2
m
free
Shorter than 2 m
Airbends 45º
Min.
1
m
free
