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The graph is used to determine the DN of the pipe and the
fitting appropriate to the application, according to the fluid
velocity and the flow rate.
Selection example:
• Specification: if the nominal flow is 10 m
sioning of the optimal flow rate must be contained in 2
to 3 m/s
• Answer: on the chart, the intersection of flow rate and
flow velocity gives the appropriate diameter, DN40.
English
20
→
Install the fitting on the pipe to comply with the
upstream and downstream distances defined by
standard EN ISO 5167-1 (see Fig. 3).
50 x DN 5 x DN
With control valve
25 x DN 5 x DN
Pipe with 2 elbows
at 90°
18 x DN 5 x DN
With pipe expansion
Fig. 3:
Upstream and downstream distances depending
on the design of the pipes.
English
22
3
/h, the dimen-
40 x DN 5 x DN
Pipe with 2 elbows at 90°
in 3 dimensions
20 x DN 5 x DN
Pipe with 1 elbow at 90°
or 1 T-piece
15 x DN 5 x DN
With pipe reduction
gpm
m
/h
3
l/min
1000
200
3000
2000
500
100
1000
50
200
500
100
20
200
50
10
100
5
20
50
10
2
20
5
1
10
0.5
2
5
1
0.2
2
0.5
0.1
1
0.05
0.2
0.5
0.1
0.02
0.2
0.05
0.01
0.1
0.3 0.5
0.3 0.5
1
3
→
Use a flow conditioner, if necessary, to obtain the best
accuracy.
→
Prevent the formation of air bubbles in the pipe (see
Fig. 4).
→
Ensure the pipe is always filled with liquid (see Fig. 5).
Correct
Correct
Direction of fluid flow
Fig. 4:
Additional recommendations on installation
DN50
DN40
DN32
DN25
DN20
DN15
DN08
DN06
5
m/s
1
3
10
5
10
30
fps
Fluid velocity
English
Incorrect
Incorrect
English
21
21
23
23
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