Can centrifugal compressors tolerate high molecular weight fluctuations?

Q: Can centrifugal compressors tolerate high molecular weight fluctuations?

A: Centrifugal compressors are designed for specific molecular weight for a particular duty. These are quite  sensitive to mol weight changes and these changes affect the compressor performance significantly. Fluctuations if any need to be envisaged before the purchase of equipment as at a later date it can pose problem of some sort.