Maintenance and repair of the dryer
HDK-CNG_EN_03_2016
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Maintenance and repair of the dryer
In order to allow maintenance work on the dryer to be carried out efficiently and
without danger for maintenance personnel, you should comply with the following
instructions.
Notes on maintenance
Attention!
Maintenance tasks may be carried out only by authorised and qualified
specialist and approved personnel (e.g. DVGW), and only with the plant in
a switched off and depressurised condition.
Hazard resulting from release of a critical gas!
If the gas system is operated using a critical gas (explosive, combustible,
toxic), it can present a hazard to people and the environment if released.
Therefore before working on dryers for critical gases
— purge the relevant pipework section with inert gas
— keep the hazard instructions for the gas in the system in a convenient
location
— prepare appropriate protective measures
— with ATEX-compliant dryers:
before work, first cancel the Ex zone,
ensure that the individual components of the dryer are also
earthed/grounded
during any maintenance work.
Note:
To assure perfect maintenance and reliable operation, we recommend
concluding a maintenance contract.
When exchange or replacement parts are ordered, always state the
dryer type and the build no. of the dryer. These data are found on the
type plate.
Carry out all maintenance work only when the plant has been shut down and
depressurised!
Bolt connections must be undone with care! Note ram pressure values!
Otherwise emerging media may cause personal injury.
Do not modify the factory settings of the control system in any way without prior
consultation with the manufacturer.
Never carry out welding work on a vessel or modify the same in any way!
Following maintenance work, always check all flange and bolt connections for
leakage and secure seating.
