August 2014

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HP Engineering Case Histories: Case 80: Sudden temperature change in a centrifugal compressor

A process upset occurred that caused the gas temperature of a centrifugal compressor to increase from the design condition of Tstart = 300°F to Tinf = 600°F in t = 0.25 hours. Some engineers..

Sofronas, T., Consulting Engineer

A process upset occurred that caused the gas temperature of a centrifugal compressor to increase from the design condition of Tstart = 300°F to Tinf = 600°F in t = 0.25 hours. Some engineers said that the time was too short for the rotor to be affected. However, the rotor had previously been rubbed, which caused a costly downtime, and now management was concerned. The engineer was asked, “What should be done?” Options Option 1 was to shut down the unit and inspect for damage. However, huge production losses would occur from the shutdown; it would not be a popular choice. Likewise, the shutdown/inspection was not risk free. If no damage was observed, then the engineers&#

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