52
WVM_BASIS_EN_03—07/2016
Replace desiccant sieve
Between vessel and upper arch pipe, desiccant sieves are fitted which retain the
drying agent dust. If these desiccant sieves become blocked, a dam pressure is
generated which can cause compressed air fluctuations in the compressed air
system.
For disassembling the desiccant sieves, the entire arch pipe must be removed
first.
Risk of falls!
The dryer must not be misused as a climbing aid! The components have
not been designed for such loads and could fracture.
Only use approved climbing aids when disassembling the upper arch
pipe.
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Depressurise dryer and take out of service (see page 42).
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Unscrew flange and screw
connections from the upper arch pipe
system (see figure).
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Withdraw upper arch pipe complete
with all mountings.
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Remove desiccant sieves and
gaskets.
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Clean desiccant sieves with
compressed air or a suitable tool (e.g.
soft wire brush).
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Renew gaskets.
Disassembling of desiccant sieve
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Mount cleaned desiccant sieves:
—
mount base gasket;
—
insert desiccant sieve;
—
mount top gasket.
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Repeat the process on the second vessel.
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Re-mount and secure the upper arch pipe system.
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If no other maintenance work is required: Restart dryer (see page 44). Check
that the connection is leak tight.
Renew desiccant
Generally desiccant has a service life up 3 to 5 years. Under favourable
conditions, the desiccant might not have to be replaced at that stage and can be
used for longer period (see also page 26). However, the service life depends
greatly on the contamination of the compressed air (or the effectiveness of the
preliminary compressed air filter respectively) and the contamination of the
ambient air at the site. Oil, dust and dirt particles tend to deposit on the desiccant
and thus reduce the effective adsorption surface. This damage is not always
reversible. If in doubt, have your desiccant assessed by our specialists.