WIKA LGG serie Betriebsanleitung Seite 22

7. Maintenance, repair and cleaning
Following successful repair, recommission the glass level gauge, see
chapter 5.4 "Commissioning".
Replacing the glass tube with model LGG-G
EN
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 rings
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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 glass level gauge, see
chapter 5.4 "Commissioning".
Replacing the valve head
A valve head can only be replaced after the glass level gauge 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 glass level gauge, model LGG