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p = 7.2 barg and instr. air min p = 4.2 barg – the mentioned values shall be defined in Basis of Design. Also 150 microns of water droplets need to be considered for sizing. Usually depending on air plant capacity 1, 2 or 3 buffers are necessary.

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Spare air compressor shall be provided, remember that the instrument air is critical. I would recommend oil free type and considering the capacity the type could be:

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For instrument air demand please see the movie and regarding plant air please consider continuous consumers and the maximum peak demand of simultaneous intermittent user:

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The dew point of instrument air at maximum operating pressure shall be lower with 10°C that the lowest expected ambient temperature for the air system, free of toxic, flammable vapor, oil and liquids and the solid particle shall be lower than 3.0 microns with solid content minor than 0.1 gr/m3.

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The inlet of the compressor shall be in a non-hazardous area, at least 5-6 m above ground with wire mesh, pay attention to provide winterization where is necessary – check lowest ambient temperature and also on suction a 3.0 microns dust filter shall be foreseen.

Dryers with silica gel up to -65°C pressure dew point, activated alumina shall provide -75°C pressure dew point and mol sieve can remove moisture below 0.1 ppmv.

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The discharge pressure is in the range of 8.5-8.8 barg – seems that is the most economical value but needs to be checked with the vendor to be sure that margin is provided to allow for the correct operation of the antisurge system.

Plant air usually is not dried but in cold climates it becomes important and economical to remove water also from plant air – an economic analysis is necessary.