23
Wavin AS+
Technical Manual
As in the equation
Q
ww,
this takes into account the discharge coefficient K and the discharge unit DU.
Frequency factor K describes the frequency of use of the sanitary drainage sources concerned, along with its simultaneity.
Frequency factor K is not expressed in dimensional terms.
The discharge unit DU is described in terms of the expected amount of waste water for a given drainage source. 1 DU = 1 l/s.
Types of pipes and sections
Single connection pipes
The term “single connection pipe” refers to a pipe that runs from a drainage source (connection point) to a downpipe, collection
pipe or underground and collector pipe. Multiple single connection pipes supply waste water to the collection pipes that run to the
downpipe, collection pipe or underground and collector pipe concerned. A distinction is made between unventilated and ventilated
single connection pipes. These are subject to allowable waste water discharge with respect to:
Maximum length of pipe
Maximum number of changes of direction (bends, etc.)
Maximum height difference along the length of the pipe
Minimum fall
Table 3: Typical frequency factor K as per DIN EN 12056 - 2.
Table 4: Application boundaries for unventilated single connection pipes conforming to DIN EN 12056-2, Table 5.
Type of building
K
Non-regular usage (e.g. in residential properties, boarding houses and offices)
0.5
Regular usage (e.g. in hospitals, schools, restaurants and hotels) and/or showers)
0.7
Frequent usage (e.g. in public toilets
1.0
Special usage (e.g. laboratories)
1.2
Application boundaries for unventilated single connection pipe conforming to DIN 12026-2, System I
Max. length of pipe (l)
4.0 m
Maximum number of changes of direction (90°)
3 x*
Maximum height difference
1.0 m
Minimum fall
1%
*Not including connection bends
