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d.
Set the Outlet Pressure Regulator (see figure 1) to the desired outlet nitrogen pressure.
e.
Consult the Nitrogen Purity tables 3 and 4 to determine the proper dimensionless flow
meter setting to achieve the desired nitrogen flow. Adjust the (customer installed) flow
controller until the dimensionless flowmeter shows the correct reading (based on the
table).
f.
Allow the system to reach equilibrium at the desired flow rate, pressure, and purity
parameters. This should take approximately 15 minutes. Vent substandard nitrogen if
necessary (see figure 4).
4.5 Receiver Tank Applications
After all the components have been properly installed (see figure 5), the following procedure
should be followed to ensure optimal operation of the entire nitrogen supply system (which
incorporates the use of a receiving tank).
a.
Adjust the (customer installed) inlet air pressure regulator until the Operating Pressure
gage (see figure 1) shows the pressure required to deliver nitrogen at the desired flow
rate (per Tables 3 and 4.)
b.
Set the flow control valve to its fully open position. The nitrogen flowmeter reading
should be at the top of the scale.
c.
Close the shutoff valve to the process and open the vent valve downstream from the
receiving tank to prevent substandard nitrogen from entering the process.
d.
Fully open the outlet pressure regulator on the nitrogen generator, and adjust the back
pressure controller until the outlet pressure gauge on the nitrogen generator reads 10
psig (0.7 barg) less than the desired nitrogen storage pressure. Maximize the storage
pressure to minimize the size of the receiver tank needed.
e.
Set the flow control valve on the front panel of the nitrogen generator to the proper
reading, as specified by the Flowmeter Adjustment table in tables 4 and 5.
f.
Purge the entire system, venting the initial nitrogen stream through the vent valve to
atmosphere. Purge time is dependent on receiver size and length of piping installed.
g.
Close the vent valve, open the process shutoff valve, and initiate the flow of nitrogen
to the process.
The use of a receiving tank upstream from the process, as detailed in this literature,
significantly reduces the effects of fluctuating nitrogen demand on the purity of the emergent
nitrogen process stream from the Parker Balston Nitrogen Generator. Parker recommends a
thorough purge of the system (see Steps C through G above) each time the unit is started.
4.6 Temperature Equilibrium
If the temperature of the inlet air to the Parker Balston Nitrogen Generator differs from the
temperature of the module (i.e. ambient temperature), the system must be allowed to reach
thermal equilibrium before a nitrogen stream of consistent purity can be delivered from the
system. If the temperature difference is 10°F-20°F (5°C-10°C), this equilibrium period may be
as long as 60 minutes. The inlet air temperature and, more importantly, inlet air dewpoint, must
not be higher than the temperature of the system, or condensation of water within the system
may occur, resulting in inefficient performance of and/or damage to the system.
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