Manual
26
Installation and wiring
Type 8011
7.3. Graphs
These graphs are used to determine the DN of the pipe and the fitting appropriate to the application, according to the fluid velocity and the flow rate.
Flow rate
Fluid velocity
Selection example:
The flow rate in the pipe is 10 m
3
/h. If the ideal fluid velocity is 2 to 3 m/s, ,
then use a DN 40 (or DN 50)* pipe according to the graphs.
0.1 0.3 0.5 1 3 5 10
0.01
0.02
0.05
0.1
0.2
0.5
1
2
5
10
20
50
100
200
m
3
/h
0.2
0.5
1
2
5
10
20
50
100
200
500
1000
2000
3000
l/min
0.3 0.5 1 3 5 10 30
m/s
fps
gpm
0.05
0.1
0.2
0.5
1
2
5
10
20
50
100
200
500
1000
DN 50 (DN65)*
DN 40 (DN50)*
DN 32 (DN40)*
DN 25 (DN32)*
DN 20 (DN25)*
DN 15 (DN15
/ 20)*
DN 08
DN 06
* For fittings:
• with external thread connections acc. to SMS 1145,
• with welding end connections acc. to SMS 3008,
BS 4825 / ASME BPE or DIN 11850 Rg2,série2
• Clamp connections acc. to SMS 3017/ ISO 2852, BS 4825 /
ASME BPE or DIN 32676
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