Instrument air is the utility that guarantees that the plant is in control. It is used as data transport for control valves because it supplies the driving force for activating these valves. It is compressed air produced by a separate system composed of air compressors, after coolers, receivers, air dryers, air storage tanks and supply lines. For reliability reasons there should be multiple and redundant compressor units. And for this use, the air supply must be of the highest possible quality, free of oil and humidity to allow proper function of the instruments. It might be the unique utility that impairs all other utilities production and the core process itself.

Just one general recommendation applies here. This system must not be allowed to fail, because if it does, all efficiency efforts would have been in vain. This should be the last place in the plant to search for additional energy savings. All redundancies are justifiable.

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