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When measuring low pressure gas flow with AISI 316L floats, oscillation of the float often
occurs, which makes it very difficult to read the flow rates. In these cases it is recommended
to install a damper in the instrument.
The damper consists of a piston mounted inside a cylinder, closed at its lower end. The
compression forces of the gas absorb the floats oscillations, maintaining it stable in the
reading point.
Close the valves during work stops at the end of the working day in order to avoid sudden
surges when started up. If the float hits the stops sharply this could cause damage to the
meter.
5.3
Liquid flow measurement
When measuring liquids the regulating valve should be installed as shown in the following
figure.
Being the shut off valve partially open, open the regulating valve slowly until the needle of the
indicator housing shows a low flow rate. Then also open the shut off valve slowly in order to
get rid of the air and then progressively to fully opened.
The required flow rate is then regulated by using the regulating valve.
Close the valves during work stops at the end of the working day in order to avoid sudden
surges when started up. If the float hits the stops sharply this could cause damage to the
meter.
SHUT OFF VALVE
REGULATING VALVE
11
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