Centrifugal compressors vibration, 437 surging

Surge A term applied to oscillations in pressure and gas flow in fans and centrifugal compressors. The condition occurs below the lower operating limit of the gas mover and is evidenced by potentially damaging vibrations and accompanied by low-frequency booming sounds or high-... 

C. Protective Instrumentation. Some compressors require an extensive list of instrumentation to avoid unsafe situations and mechanical damage to the compressors themselves. This is particularly true in the case of centrifugal machinery. A previous section discussed the most prominent example, the surge control system. Other likely sources of damage of the rotating machinery are vibration and the loss of lubrication. 

Surge, sensitive to vibration These are unique problems for centrifugal and axial compressor, not for reciprocating, OIS, or OFS compressois. 

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