Meters Placed After A Regulator; Maintenance; Maintenance Of The Meter; Maintenance Of Optional Equipment - WDV Molline DELTA Manual De Instrucciones

• Some gas still inside the meter and the pipe,
therefore sufficient ventilation is required.

5.4 Meters placed after a regulator

Installation has to be done in accordance with the
technical manual of the specific regulator. During
pressurisation and depressurisation, insure that
the pressure variation should not exceed 0.3 bar
per second.

6 Maintenance

6.1 Maintenance of the meter

Once installed, the meter does not require any
specific attention except a periodical check or
change of the lubricant filled in the covers.
After start-up:
Natural gas: After the preliminary term of service,
the lubricant level should be checked.
Other gases: After a working period of 100 hours
from commissioning, the lubricant level should be
checked.
If the lubricant level is appreciably low, if the lubri-
cant is emulsified or if there is a chemical reaction
between the lubricant and the gas, the lubricant
should be reassessed and changed to fit the pre-
vailing conditions.
Periodical change of lubricant:
The period between checks or changes of lubri-
cant depends of the operating conditions (pres-
sure variation, flow rate...).
Natural gas: Under normal conditions, lubricant
has to be changed every 5 to 8 years. When the
meter is used with extremely clean gas the period
can be extended.
Other gases: Please consult us.
Use solvent and alcohol free product to clean the
meter.
Repair must be done only by qualified personal.
Afterwards a tightness test with 1.1 x PS (Pmax)
must be performed.
If used with wet gas, internal and external effect of
corrosion has to be checked regularly and in case
of severe corrosion, the meter has to be replaced.
Spare parts:
WDV / Molliné GmbH · Mönchstraße 11 · 70191 Stuttgart · Tel. 0711 / 35 16 95 - 20 · Fax 0711 / 35 16 95 - 29 · www.molline.de
When changing pressure containing parts, ensure
that spare parts that comply with the PED are
used.
The right spare parts are traced by providing the
serial number of the meter to Itron and/or by us-
ing the Itron CD ROM "Spare parts catalogue".
6.2 Maintenance of optional
equipment

6.2.1 LF and HF transmitters

These transmitters do not require any specific
maintenance. The function of the transmitters can
be checked by comparing the electronic index
with the meter index.

6.2.2 Filter

If an increase of pressure loss is noticed, the filter
should be checked and cleaned/replaced before
any maintenance on the meter.
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