Centrifugal Compressors – Impeller Stress Level

The following speed margins are defined by API:

• Rated (Design) Speed: 100%
• Maximum Continuous Speed: 105% of Rated Speed
• Trip Speed: 110% of Maximum Continuous
• Overspeed: 115% of Maximum Continuous

Figure 200-28 identifies the impeller stresses at various rotational speeds. Reduced yield strengths required for corrosive gas will correspondingly reduce maximum head per stage through reduction in speed.

Impeller Stress Levels at Various Speeds

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