studied the effect of tip clearance with six different centrifugal compressors and data available in literature. The changes in the overall performance of the compressor stage were examined.There is a large variation in the slopes of the efficiency. It varies from 0.02 to 0.1 efficiency drop per 0.1 change in the relative tip clearance. Analysis of the data in this study demonstrated that no clear correlation between the sensitivity of the tip clearance loss and the specific speed, the diffusion ratio, the blade number and the ratio of blade height exists.