tailieunhanh - Intro Predictive Maintenance 2E Episode 9

Tham khảo tài liệu 'intro predictive maintenance 2e episode 9', kỹ thuật - công nghệ, cơ khí - chế tạo máy phục vụ nhu cầu học tập, nghiên cứu và làm việc hiệu quả | 272 An Introduction to Predictive Maintenance INLINE CONFIGURATION 300 PSI 100 PSI 100 PSID 100 PSID OPPOSED CONFIGURATION Figure 13-1 Impeller orientation. In single-stage centrifugal pumps impeller orientation is fixed and is not a factor in pump performance however it must be carefully considered in multistage pumps which are available in two configurations inline and opposed. Inline configurations see Figure 13-1 have all impellers facing in the same direction. As a result the total differential pressure between the discharge and inlet is axially applied to the rotating element toward the outboard bearing. Because of this configuration inline pumps are highly susceptible to changes in the operating envelope. Because of the tremendous axial pressures that are created by the inline design these pumps must have a positive means of limiting endplay or axial movement of the rotating element. Normally one of two methods is used to fix or limit axial movement 1 a large thrust bearing is installed at the outboard end of the pump to restrict movement or 2 discharge pressure is vented to a piston mounted on the outboard end of the shaft. Operating Dynamics Analysis 273 Multistage pumps that use opposed impellers are much more stable and can tolerate a broader range of process variables than those with an inline configuration. In the opposed-impeller design sets of impellers are mounted back-to-back on the shaft. As a result the other cancels the thrust or axial force generated by one of the pairs. This design approach virtually eliminates axial forces. As a result the pump does not require a massive thrust-bearing or balancing piston to fix the axial position of the shaft and rotating element. Because the axial forces are balanced this type of pump is much more tolerant of changes in flow and differential pressure than the inline design however it is not immune to process instability or to the transient forces caused by frequent radical changes in the operating envelope.

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