Daily maintenance tasks
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HDK-CNG_EN_03_2016
Daily maintenance tasks
Carry out visual and function check on the complete dryer
► Check dryer for external damage or unusual noise generation.
► Duly eliminate any defects found.
Clean dryer
ATEX-compliant dryers
A buildup of dust on the dryer can be dangerous. The dryer must therefore be
cleaned regularly. The cleaning interval depends on the dust loading of the
ambient air. The more dust in the air, the more frequently the dryer needs to be
cleaned.
Warning of static charge!
With ATEX-compliant dryers,
never use dry textiles for cleaning purposes.
The friction they produce can cause static discharge. That in turn could
create a combustion source.
Therefore always
clean dryers with damp cloths!
► Clean the dryer regularly with a damp cloth to prevent any hazardous
buildup of dust.
► Only dampen the cloth with water, wring it out well, and do not use
additives!
Dryers that are not intended for an ATEX environment
► Clean the dryer once a week with a damp cloth.
► Only dampen the cloth with water, wring it out well, and do not use additives!
Check dam pressure
If, following depressurisation of a vessel, e.g. after the expansion phase, the
positive pressure has not decreased to compressor inlet pressure (CIP), then
there is a residual pressure, designated as dam pressure, in the vessel.
► Check for dam pressure: if the dryer functions correctly, the respective
pressure gage indicates CIP. Then there is no dam pressure.
If the dam pressure is greater than 1 bar:
► Depressurise the dryer and shut it down (see page 39).
Dam pressure can be caused by:
a regeneration gas return line,
a blocked dust sieve or
drying agent which is too old.
The respective necessary maintenance measures are described in the following
sections.
Check function of all condensate trap
Check the electronic condensate drain in accordance with details in the manual
of the condensate drain.
