11. Maintenance of MQM Quantometers
1.
Quantometers without oil pump do not require special services.
They are maintenance-free.
2.
Quantometers with an oil pump require periodically maintenance:
2.1.
Lubrication every 2 to 3 months if the gas is clean and filtered
upstream the meter:
DN 50: 2 strokes, DN 80: 4 strokes, DN 100: 4 strokes, DN 150: 7 strokes
2.2.
If the gas is carrying dust and/or moisture then the lubrication has to be
done at least every month.
3.
A repair of the Quantometer has only to be done by competent and authorized
personnel like the Service Engineers from Metreg Technologies.
12. Commissioning of the MQM Quantometer
The start-up procedure of the MQM Quantometer follows the installation
and leakage test of the connections:
1.
Open slowly the upstream valve (fig. 2 and fig. 3)
to pressurize the pipe until operation pressure is achieved.
2.
The rate of pressure increase shall not exceed 350 mbar/s.
3.
At operation pressure level open the upstream valve completely.
4.
Slightly open the downstream valve (fig. 2 and fig. 3).
5.
At operation pressure level the downstream valve
can be opened completely.
6.
Perform a leakage test on the meter at operation pressure.
7.
Remove the startup sieve after 4 to 6 weeks (if installed).
13. Decommissioning procedure of the MQM Quantometer
1.
Take care of appropriate ventilation of the installation room.
2.
Depressurize to atmosphere only to areas
with no active ignition sources.
3.
Reduce the operating pressure slowly (e. g. < 350 mbar/s).
4.
Open the bolts and nuts of the flanges only
if the pipe is completely depressurized.
5.
Carefully take out the meter from the pipe connection.
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