January 2007

Letters to the Editor

Leters to the Editor

Vibration limits for gas turbines Thank you for Mr. Bloch's "HPIn Reliability" column, "Vibration limits for gas turbines" (October 2006). Any attempt to establish alarm limits for predictive mainten..

Vibration limits for gas turbines Thank you for Mr. Bloch's "HPIn Reliability" column, "Vibration limits for gas turbines" (October 2006). Any attempt to establish alarm limits for predictive maintenance (PdM) activities should be applauded, as identifying change in equipment performance and understanding its significance to overall equipment reliability is the bread and butter of a condition-based monitoring (CBM) program. The overall vibration level severity charts in the article may be somewhat misleading to readers not familiar with the nuances of vibration analysis. Three significant factors that affect alarm limits are not discussed in the article: How the data is collecte

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