Abstract
Considerable effort has been expended towards improving the thermodynamic performance of rotary air compressors and full advantage has been taken of these advances by modifying the design, installation, or application of the machines in full-scale plant. In large industrial units the economics of operation are demonstrated by the availability of the plant, i.e. time available for production. This reflects directly on the mechanical reliability and, in particular, the means for monitoring the mechanical performance in order to give forward warning of maintenance or adjustment requirements. For this purpose various techniques are in the course of development and this paper deals with the amplification of vibration monitoring equipment of the accelerometer and proximity probe types.
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