38
Wavin AS+
Technical Manual
Phone. +31(0)38 42 94 951
Collecting pipe with primary ventilation
Pipes with primary ventilation pipes can be designed as col-
lecting pipes with primary ventilation. In these cases, several
single pipes with primary ventilation run into one collecting
pipe with primary ventilation.
Calculation
The rule applied here is that the cross-section of the collecting
pipe with primary ventilation must total at least half the sum
of the individual cross-sections of the single pipes with pri-
mary ventilation. Except in single-family homes, the nominal
diameter of the collecting pipe with primary ventilation must,
however, be at least one nominal diameter greater than the
corresponding single pipe with primary ventilation.
The following therefore applies:
ASHL ≥AEHL
1
+ AEHL
2
+ ……AEHL
n
2
ASHL
cross-section of the collecting pipe with
primary ventilation in mm
2
or cm
2
AEHL
1
- AEHL
n
cross-section of the collecting pipe with
primary ventilation in mm
2
or cm
2
Example
Given that:
A multi-occupancy residential building has three single
pipes with primary ventilation of DN 90 (A, B, C) that should
be grouped into one collecting pipe with primary ventilation.
Objective:
Diameter of the collecting pipes with primary ventilation D+E
3 single pipes with primary ventilation DN 90 (ABC)
DN 90 Wavin AS+
Di = 80.8 mm
Cross-sectional area A = 51.3 cm
2
Pipes with primary ventilation B+C run into collecting pipe
with primary ventilation D
The following therefore applies:
Cross-sectional area B+C = 2 x 51.3 cm
2
= 102.6 cm
2
102.6 cm
2
/2 = 51.3 cm
2
. This corresponds to a diameter of
DN 90
Assuming the nominal diameter of the collecting pipe with
primary ventilation must be at least one nominal diameter
bigger than the corresponding single pipe with primary venti-
lation, collecting pipe with primary ventilation D has a nominal
diameter of DN 100. DN 90 would be sufficient in the case of
a single-family dwelling.
Single pipes with primary ventilation A, B, and C (all measu-
ring DN 90) run into collecting pipe with primary ventilation E
The following therefore applies:
Cross-sectional area A+B+C = 3 x 51.3 cm
2
= 153.9 cm
2
153.9 cm
2
/2 = 76.95 cm
2
Selected:
Wavin AS+ NG, DN 100
Di = 77.6 cm
2
The cross-sectional area of AS NG DN 100 is more than the
calculated minimum cross-section, and also one nominal
diameter bigger than the single pipes with primary ventilation.
Collecting pipe with primary ventilation E can thus be installed
in DN 100 configuration.
Fig. 22: Example.
A
B
C
D
E
