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[IonCube]

Hey there.

 

Our N2 generator is 60Nm3 & is powered by reciprocating compressor, this allows us to maintain a downstream pressure upto a min. 3bar. LN2 is employed in case of any further requirement.

 

Any circuit leakages, air quality, carbon molecular sieves, coconut mat, filters, dryers are OK...

 

Problem we are facing is that we cannot increase downstream pressure which is now 1.8bar max. We have overhauled compressor & our mechanical dept. say that compressor is reaching 7.4bar within 93sec which is measure of its good health. (This time/pressure is measure when air supply to PSA unit was disallowed). However when we allow air to PSA unit the pressure we get at compressor is 5.6bar max which somewhat equals our surge N2 vessel & I am getting flow 35Nm3 max (above that surge pressure/flow fluctuates heavily)

 

Now my question is that N2 purity is OK (even via orsat analysis), PSA twin tower cycling (60sec each), related instrumentation is OK...what then can be a problem? One thing I want to share that after cooler at compressor discharge (S&T heat exchanger) was quiet leaky & 10 out of 26 tubes are blinded. However, air temperature is slightly above ambient temperature which is well within limits

 

Secondly I also want to know that why gauges at my individual PSA tower reaches 6bar (before changeover) when the pressure from compressor & pressure at surge vessel is about 5.6bar, How is it possible to have pressure higher than the pressure source i.e compressor?