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2 Atlas Copco ZR4 oil free, water-cooled screw compressors with MD4 air dryers c/w water savers nominal 900cfm capacity /machine. 1989 and 1991. 1 off Ingersoll Rand 1,000 cfm oil free water cooled screw compressor, installed but not commissioned. Recirculation water cooling system with externally mounted air blast coolers, installed1989. Mill air pressure control by Atlas Copco Intellivalve system for energy saving.