Page 17 of 60
SGM-101F -
installation
In the event that the minimum values shown in previous table 4 can not be met, it is necessary to adopt every
precautions to mitigate the
fl
ow turbulence and improve the homogeneity of the
fl
ow velocity in the pipe.
One of the best device is the transducers upstream installation of a
fl
uid threads recti
fi
er, which allows to have a
straight section length of the pipe less than indicated.
The pipe where the transducers are placed must have the following characteristics:
- smooth surface without rust or other surface deterioration;
- circular cross section
The ideal points for the transducer positioning are:
- hydraulic circuit lowest point (a);
- vertical pipes with the upward
fl
ow (b);
- inclined pipes with the upward
fl
ow (c);
- vertical open drain pipes with a section restriction to avoid sudden pipe emptying during
fl
ow measurement (d)
a
b
c
Restriction
d
In the case of a horizontal pipe, the transducers positioning should be between ± 45 ° relative to the horizontal
center line of the pipe. This is to avoid that any air bubbles can interfere with the
fl
ow velocity detection,
Furthermore, in the case of buried pipe must observe the following measures:
with insertion type transducers L>540mm; with clamp-on type transducers L>400mm.
L
L
H 200mm
45°
45°
