About your safety
HDK-CNG_EN_03_2016
15
Signs and labels
The type plates are located on the vessel and on the filters. Note these signs on
the dryer. Keep them complete and always legible.Keep them complete and
always legible.
Information on inerting the dryer
Inerting is an explosion prevention measure. It is essential to comply with the
following data and information on inerting. Non-compliance with this information
can result in the formation of a potentially explosive atmosphere inside the dryer,
thus posing considerable danger.
Only use suitable tools for working on the system.
Ex-zones are to be cancelled prior to maintenance. Strict compliance with
the operating instructions and the explosion protection documentation is
required for this purpose.
Slowly open the gas inlet valve!
Make sure sudden pressure build-up is avoided! If pressure builds up too
fast, this may cause damage to the dryer. Therefore always open the gas
inlet valve slowly!
Danger!
The system is pressurised during the inerting procedure.
There is a very considerable risk of personal injury, when carrying out
work on the activated and pressurised dryer. Suddenly escaping
compressed air might cause serious injuries.
Never remove any parts of the dryer as long as the unit is pressurised!
Inerting for taking out of service
Inert the dryer 2x for taking out of service!
The drying agent can still release natural gas after the initial inerting. This
renders a second inerting procedure necessary. The second inerting
operation must not be carried out before at least 10 hours have passed
since the first inerting procedure. This procedure ensures that gas is no
longer bound in the drying agent and cannot be released.
The dryer must be completely purged with inert gas at least for two times before
each decommissioning, wherein a time buffer of 10 hours must be maintained
between the purge-processes. This buffer is necessary so that the bounded gas
constituents in the drying agent can outgas. The individual operations are
identical to the inerting activities during the commissioning of the dryer ( see
section
Immediately operate dryer in natural gas system
