April 1999

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HP Reliability: How installation and operation influence MTBF

Mean-time-between and mean-time-to-failure (MTBF and MTTF) can differ for the same equipment. The differences are often attributable to quality of installation and grade of operation. This situation i..

Bloch, Heinz P., Hydrocarbon Processing Staff

Mean-time-between and mean-time-to-failure (MTBF and MTTF) can differ for the same equipment. The differences are often attributable to quality of installation and grade of operation. This situation is emphasized in Fig. 1, which shows different centrifugal pump conditions. As can be seen from this illustration, pump impeller life can be assessed with reasonable probability once operating practices have been examined in light of suction and discharge recirculation, cavitation and so forth. Other curves are available that explain the meanings of best, good and commercial practices in areas such as shaft alignment, closeness of pipe elbows to pump suction nozzle, etc. Of course, a sim

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