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© 11.2023
8 Maintenance
8.1 Maintenance Plan
The following sections describe the maintenance work required for optimal and trouble-free operation of the device.
If increased wear is detected during regular inspections, the required maintenance intervals must be shortened in
accordance with the actual wear.
For any questions on maintenance work and intervals, please contact the manufacturer.
The intervals for monitoring and maintenance work are strongly dependent on the operating situation and the condition
of the gas. This is why no fixed intervals can be given. For Germany, it is recommended that the maintenance periods as
specified in DVGW work sheet G 495 are observed initially. For each system, this must be followed by determining the
maintenance interval independently on a medium-term basis.
During maintenance work, the components must be cleaned and subjected to a thorough visual inspection. This is also
necessary if irregularities in the operating behavior have been detected during operation or during functional tests.
Damaged parts and O-rings dismounted during dismantling must be replaced with new ones.
The item numbers mentioned in chapter 11.3 (parts for maintenance work) correspond to those listed in the
spare parts drawings and spare parts lists.
It is recommended to stock the parts listed in chapter 11.3 for maintenance work.
Interval Maintenance work Personnel
According to the
data given in the
DVGW work sheet G
495 or if necessary
Replacing O-rings
Qualified personReplacing diaphragms
Replacing the valve plate
7.7 Decommissioning
For decommissioning, please refer to the documents listed under item 1 “General Information” and the system operator's
work instruction.
Procedure (fig. 7.1)
• Slowly close the outlet shut-off valve (item 7.13) or
• Close the ball valve upstream of the valves and fittings (item 7.01).
• Depressurize the system (item 7.11).
• Close the venting ball valve (item 7.11).
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