Maintenance work to be completed every 24 months
48
HDK-CNG_EN_03_2016
Note:
For an inspection of the pressure vessels, the drying agent must be
removed. For an inspection of the pressure vessels, the drying agent
must be removed, as described below.
When inspecting the pressure vessel, it is recommended to check the
condition of all fittings such as e.g. sieve bottom and dust sieve,
including gaskets. If necessary, these fittings must be cleaned or
renewed. In the event of comprehensive maintenance or repair tasks,
contact the manufacturer (see page 8).
Replace dust sieve (Flow distributor)
Dust sieves are installed in the vessel that retain the drying agent dust. If these
dust sieves block, dam pressure is generated and this can cause natural gas
levels in the system to fluctuate.
To remove the dust sieves, the check valve block and attached angle pipes also
need to be removed.
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.
To remove the pipe bridge, only use approved climbing aids.
► Depressurise the dryer and shut it down (see page 39).
► Dismantle and remove upper pipe bridge:
—
Unfasten connections between pipe bridge and downstream filter.
—
Unfasten cap nuts between pipe bridge and vessels (2, 3).
—
Remove upper tube bridge.
► Unfasten cap nuts on dust sieves, remove Teflon tape and remove dust sieves.
► Clean dust sieves with compressed air or a wire brush, or replace if necessary.
► Tighten dust sieves back into place and seal with new Teflon tape.
Remove the upper pipe bridge
► Reinstall complete pipe bridge, and tighten down cap nuts.
► Restart dryer (see page 40). Check that the connection is leak tight.
