Engineering manual - SAB 193-233-283 S A-frame (including ATEX)
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Fig. 21: OHU 04136
However, the discharge gas still contains a certain amount of fine oil drops, which are separa-
ted as the discharge gas passes the
fine oil separator elements (the fine filters).
This oil is
returned to the compressor in separate piping systems as described later in this section.
Normally, the fine oil separator elements do not need to be inspected, but if it is considered
necessary, e. g. if increased oil consumption is observed in the unit, they can be removed
through the ends of the oil separator.
Oil return system for fine filter element
Whether the unit is delivered with
one
or
two
discharge lines, thus with
one
or
two
fine oil sep-
arator elements, two oil return pipes will be fitted on the unit. See piping diagram.
The oil separator is fitted with an automatic oil return valve, see subsection 4.13
Oil vessel
As already mentioned, the lubricating oil is collected in the oil vessel. The oil level in the vessel
must always be visible in the sight glasses pos. 31. The correct amount of oil in the unit is sta-
ted in Table 49, Table 50 and Table 51 in section
The oil vessel contains one or two heating elements, pos. 30, which must always be
switched
on when the unit is not operating
and
switched off when the compressor is started
. Re-
member to switch off the heating elements when oil is drained off the oil vessel before an oil
renewal.
After a long period of standstill where the heating elements have been switched off they must
be connected for
at least 8 hours
before the unit is put into operation.
Demister
From the compressor
To oil vessel
Fine oil separator element, pos. 55
Oil return
Oil return