Metreg MQM - Maintenance; Periodic Maintenance for Oil-Pumped Units; Authorized Repair; Commissioning

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ltered
   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(g.2andg.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(g.2andg.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angesonly
 ifthepipeiscompletelydepressurized.
5. Carefullytakeoutthemeterfromthepipeconnection.
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