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5. Selecting flushing times based on pipe
diameter and line lengths
Table 1: Flushing time t (s) for Cu and
stainless steel pipelines for cold and warm:
l (m)
t (s)
d 15
d 18
d 22
d 28
d 35
5 6 8 13 21 33
6 7 10 15 26 40
7 8 12 18 30 47
8 9 13 20 34 54
9 10 15 23 39 60
10 11 17 25 43 67
11 12 18 28 47 74
12 13 20 30 51 80
13 14 22 33 56 87
14 15 23 35 60 94
15 17 25 38 64 100
20 22 33 50 86 134
25 28 42 63 107 167
30 33 50 75 129 201
35 39 59 88 150 234
40 44 67 101 171 268
45 50 75 113 193 301
50 55 84 126 214 335
55 61 92 138 236 368
60 66 100 151 257 402
70 77 117 176 300 469
80 88 134 201 343 536
90 99 151 226 386 603
100 111 176 251 429 670
Table 2: Flushing time t (s) for Geberit
Mepla pipelines for cold and warm:
l (m)
t (s)
d 16
d 20
d 26
d 32
d 40
5 4 7 13 22 36
6 5 9 16 27 43
7 6 10 18 31 50
8 7 12 21 35 57
9 8 13 24 40 64
10 9 15 26 44 71
11 10 16 29 49 78
12 10 18 31 53 85
13 11 19 34 57 93
14 12 21 37 62 100
15 13 22 39 66 107
20 17 29 52 88 142
l (m)
t (s)
d 16
d 20
d 26
d 32
d 40
25 22 37 65 111 178
30 26 44 79 133 214
35 30 52 92 155 249
40 35 59 105 177 385
45 39 66 118 199 321
50 43 74 131 221 356
55 48 81 144 243 392
60 52 88 157 265 427
70 61 103 183 310 499
80 69 118 209 354 570
90 78 132 236 389 641
100 87 147 262 442 712
Select the following sequence to set the flushing time
and flushing interval:
1. Determine the flushing time
2. Set the flushing time and flushing interval with the
KHS Service Handy as described in 1.4
The selected preset settings are retained even if the
power supply is interrupted.
Example for determining the flushing time:
e.g. for a single feed line with various pipe diameters
up to the riser line:
(5) (1)
Determine the line length and dimension for
cold water
5. (2)
Find the determined flushing times from Table 1
or Table 2 correspondent to the pipe system
+ + +
Tapping points/
Appliances
