Isoil impianti SpA Page 9
All rights reserved. Reproduction of this manual is forbidden. Code MA038/00/EN/03
downstream the same meter.
• Water must not flow through the meter.
• Meters must be installed in such a way that air or vapour do not enter through the
liquid under measurement. It is always suggested to install an air separator just
upstream the meter.
• To avoid hammer shocks which may strongly damages the meter, it is not advisable
to install upstream or downstream the meter any quick closing valves.
• It is recommended to install root valves at the inlet and outlet to ease servicing
operations and isolation of the meter
3.2 Start-up precautions
• Before proceeding with the start-up make sure that:
- The meter is adequately fixed
- All the connections are tightened
- Air is bled from the pipes
• If a calibration mechanism is associated with the meter, before the start-up it must be
filled with lubricating oil
• Vent out all the air eventually present in the line
• When the meter is operated for the first time, fill it slowly with the operating fluid by
following this procedure:
- Open slowly the upstream isolation meter or fill the meter by gravity
- Open slowly the downstream isolation meter letting the flow rate rise smoothly to
the operating value
CAUTION
Be very careful when starting up the meter: if the air enters the
measuring chamber the rotor can easily reach high rotational
speeds, leading to abnormal wear of the vanes and other
components; this, in turn, will lead the meter to a major failure.
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