26
Wavin AS+
Technical Manual
Phone. +31(0)38 42 94 951
Sizing of unventilated collecting connection pipes
K=0.5
K=0.7
K=1.0
DN
Di (mm)
∑DU
∑DU
∑DU
1.0
1.0
0.8
50
44
2.0
2.9
1.0
56/60
49/56
9.0
4.6
2.2
70*
68
13.0**
8.0
4.0
80
75
13.0**
10.0
5.0
90
79
16.0
12.0
6.4
100
96
Sizing of ventilated collecting connection pipes
K=0.5
K=0.7
K=1.0
DN
Di (mm)
∑DU
∑DU
∑DU
3.0
2.0
0.8
50
44
5.0
4.6
1.0
56/60
49/56
13.0
10.0
2.2
70*
68
16.0
13.0
4.0
80
75
20.0
16.0
5.0
90
79
25.0
20.0
6.4
100
96
* not applicable to toilets.
Table 9: Sizing of unventilated collecting connection pipes in accordance with Prandtl-Colebrook.
Table 10: Sizing of ventilated collecting connection pipes in accordance with Prandtl-Colebrook.
Downpipes
Downpipes are vertical pipes that run down through the floors
of a building and are ventilated at roof level. Downpipes
should be as perpendicular as possible. Single and collecting
connection pipes are connected via branches. The location
of the branches should be given special attention during the
planning and layout stage, as they have a direct impact on the
sizing of the downpipe.
Proper matching of such items as branch pipes equipped with
internal radius (swept) running into the downpipe can favour
the hydraulics of the system, leading to the use of reduced
dimensions.
Calculation
The waste water runoff is sized using the following equation:
The pipe diameters of ventilated downpipes conforming to
DIN 12056-2, Table 10 are determined using waste water
discharge calculation Q
.
Q
ww
= K .
∑
DU
