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INF-TN1FSH-E
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2.2.1. Length of straight section of pipe
To assure the accuracy of flow rate measurement, allow sufficient length of the straight section of the pipe on the
upper/lower stream side, referring to “straight pipe conditions” shown below.
L
≧
10D
Detector
L
≧
50D
L
≧
30D
In case that flow control valve exists on
upstream side.
In case that flow control valve exists on
downstream side.
L
≧
10D
L
≧
10D
L
≧
10D
L
≧
5D
L
≧
30D
≧
1.5D
L
≧
50D
0.5D
or
more
10D or more
10D
or
more
D
L
≧
5D
L
≧
5D
Check valve
Stop valve
10D or more
90 bend
Tee
Diffuser
Reducer
Various Valve
Pump
(Note) The source : JEMIS-032
Classification
Upstream side
Downstream side
( D : Inside diameter of pipe)
P