WIKA LGG Betriebsanleitung Seite 22

7. Maintenance, repair and cleaning
Place the pressure frame over the mica shield and centre
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Carry out the mounting as described in chapter 5.2 "Mounting of
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models LGG-R, LGG-T, LGG-M"
Seat the cover back via the threaded studs
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Carry out the leak test
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EN
Following successful repair, recommission the sight glass level indicator,
see chapter 5.2 "Commissioning".
Replacing the glass tube with model LGG-G
Depressurise the vessel
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Close the lower and then the upper valve head
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Open the drain valve and allow the media to drain
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Remove protective devices, if present
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Remove the damaged glass tube and sealings
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Insert new sealing plugs
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For mounting, see chapter 5.3 "Mounting of model LGG-G"
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Carry out the leak test
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Following successful repair, recommission the sight glass level indicator,
see chapter 5.2 "Commissioning".
Replacing the valve head
A valve head can only be replaced after the sight glass level indicator
has been isolated from the process. If necessary, the indicator must be
removed from the vessel.
It is recommended that the repair of valves is carried out by the
manufacturer.
Repair work by the plant operator should only be carried out by trained,
skilled personnel, who have proven experience in such work. Following
the completion of the work, the functional safety of the shut-off devices
must be ensured by the plant operator on their own responsibility.
22 Operating instructions, sight glass level indicator, model LGG