22
G322 - Five sets of packings per rod may be used to
increase leakage control, with a purge/vent chamber
between the top three packings and the bottom two
packings. Confi gured for suction pressures at or
below ambient. Provides tighter leakage control than
G212/G222 confi gurations.
Vacuum applications may plumb the vent/purge line
to the discharge or second stage inlet. Additional ‘G’
style packing arrangements can be engineered for
specialty applications. If your ‘G’ style compressor
does not match to one of those listed above, contact
the factory for assistance.
‘H’ SERIES BOOSTERS - The ‘H’ series compressor is
designed to compress diffi cult to contain or extremely
toxic or hazardous, industrial gases. Two distinct
isolation chambers provide the maximum leakage
control available. Two pairs of tangent-tangent
packings per rod provide the fi rst isolation of the
process gas. A second plenum chamber is added,
through which purge gas may be run. Three pairs of
tangent-tangent segmented packings per rod with a
purge chamber between the top two and the bottom-
most packings are located in the bottom of the lower
plenum chamber. This combination of ‘B’ and ‘H’ series
options provides the standard H2211 confi guration.
Additional quantities of packings may be added for
tighter control. Application where the suction pressure
is lower than the pressure in the upper vent/purge
chamber (vacuum or high pressure padding) can also
be handled in standard confi guration.
For special applications, additional confi gurations are
available. Contact factory for further confi guration
details.
FACTORY ASSISTANCE
It cannot be stressed enough that any
installation questions should be referred to the
factory. Proper installation of the compressor will
add years to the life of the compressor and system.
Improper installation can cause future problems that
are expensive and diffi cult to solve without completely
reinstalling the compressor and may void the warranty.
Call the factory for assistance.
Remember:
There is no safe gas other than air!
‘G’ SERIES BOOSTERS - The ‘G’ series booster
compressor is designed to compress standard
industrial gases and allows for venting or purging of
the packings. This gives a much greater degree of
leakage control. In the ‘G’ series, there are two sets
of gas packings, the upper and the lower. The upper
set is used to control the blow-by past the piston
rings. Ideally, little or no gas should escape past
these packings. What gas does leak by the upper set
of packings is trapped in a vented area by the lower
set of packings. The vented area must be piped to
an appropriate location outside for safe release to
atmosphere or it may be purged by an inert gas like dry
nitrogen with the outlet purge mix piped to a suitable
location (i.e. a low pressure fl are). An inert gas purge
must be at a pressure below the suction pressure and
above local ambient pressure. If the purge gas cannot
meet these pressure requirements, or if it is necessary
to pad the packing at a pressure higher than the inlet
pressure, the packing arrangement must be reversed.
Contact the factory if assistance is required. Three or
more pairs of tangent-tangent segmented packings are
used per rod, as follows (see Figure 17):
G211/G221 - Three/four packings per rod, with a
purge/vent chamber between the top sets and the
bottom-most set, confi gured for suction pressures
above ambient. G221 provides more leakage control
than G211.
G321 - Five sets of packings per rod may be used to
increase leakage control, with a purge/vent chamber
between the top three packings and the bottom two
packings. Confi gured for suction pressures above
ambient. Provides tighter leakage control than G211/
G221 confi gurations.
G212/G222 - Three/four packings per rod, with a
purge/vent chamber between the top sets and the
bottom-most set, confi gured for suction pressures
at or below ambient. G222 provides more leakage
control than G212.
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