The goal of any test must be to prove reliability. In centrifugal compressers there are basically two types of tests. The first proves the mechanical integrity, while the second verifies the aerodynamic performance. No one test can satisfy all goals so it is left to the purchaser to specify the type of test(s) which will satisfy his requirements. This paper discusses the limitations of various types of tests. Emphasis is given to Hydrocarbon Testing and, in particular, Class I Hydrocarbon Testing.

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