Abstract
One way to increase productivity is by reducing downtime on production machine in general, downtime is divided by planned downtime and unplanned downtime. Downtime can be minimized by conducting preventive maintenance. PT. XYZ is a company engaged liquid oksigen, nitrogen and argon manufacturing. In their maintenance system PT. XYZ is still using corrective maintenance method where repair will be conducted if any damage has been occured.
 There fore this research is conducted to determine maintenance time interval using age replacement method. This research subject is air sparation plant consists of filter unit, recycle nitrogen compressor unit, and argon purification unit.
 Based on the analysis of the results obtained, it is known that with the age replacement method the optimal component replacement time interval for the Argon Purification Unit component is 32,400 minutes, and the Recycle Nitrogen Compressor Unit is 31,500 minutes. with total annual maintenance costs of Rp. 449,921,405. Compared to the cost of maintenance in companies that have a value of Rp 3,115,210,778, the treatment system using the age replacement method is more efficient at 69,23%.
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