Page 265 - Water_Controls_for_Public-Commercial

Sanitary technical data /

• CD branch: direct flush
(V) Design velocity = 2 m/sec.
(Q) Design flow rate = 2 L/sec.
- Ø minimum interior of final horizontal pipework: 36mm
Q D J U
FLOW RATE DIAMETER PRESSURE DROP VELOCITY
L/sec. mm *m head/m m/sec.
Theoretical Steel 1m head ~0.1 bar
internal pipe
diameter
20
200
0.003
15
0.004
0.005
0.006
10 0.007
9 0.008
8 0.009
0.010 0.9
7 4" (102/114) Floors
100
6 0.015
90 3 1/2" (90/102) 0.9
5 0.02
80 3" (80/90)
1
4 70
2 1/2" (66/76) 0.03
1.1
60 0.04
3
0.05 1.2
2" (50/60) Rising
50 0.06 pipes
0.07 1.3
2 CD Branch
0.08
Direct flush
40 1 1/2" (40/49) 0.09 1.4
0.10
1.5
35 1 1/4" (33/42) 1,5
0.15 1.6
30
1 0.20 Under 1.7
0.9 1" (26/34) 0.25 ground 1.8
0.8 25 0.30
1.9
0.7 0.40 2
20 3/4" (20/27)
0.6 2.1
0.50
0.5 0.60 2.2
0.70 Buried 2.3
0.4 15 1/2" (15/21) 0.80 networks 2.4
ABC Branch
0.90
Basins & urinals 1 2.5
0.3 3/8" (12/17)
10 3
0.2
9 1/4" (8/13)
4. Pressure drop
In line with the rules of use, the pressure drop should be checked in the whole installation so as to confirm the choice of diameter.
There are 3 types of pressure loss to consider:
- Regular (or linear) pressure drops concerning the installation. They are linked to friction in the pipework.
The material (copper, multilayer, PEX, iron) used for the pipework also plays a role.
- Slopes (or variation in altitude) in the installation.
- Specific (or individual) pressure drops are linked to the equipment (water meter, pressure reducers, boilers,
group thermostatic mixing valves, elbows etc.).
Contact manufacturers for more information.
Then check that the residual dynamic pressure is sufficient at each point-of-use.
If the drops in pressure are too significant to supply the furthest valve, choose a larger diameter or use a tank with a pressure pump
(contact manufacturers).

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Sanitary technical data 263 INDEX