Centrifugal Pump Case Study

Abstract- This paper represents the generic process of FMECA for centrifugal pump failures and a case study on centrifugal pump failure cost estimation actual and after implementation of optimum strategies of maintenance. FMECA focused on critical components and reduce them their priority level and frequency with exact analysis of maintenance requirement of centrifugal pump.
Introduction:
Centrifugal pumps have been considered as one of the most important components in any plant which have to deal with fluids as essential part of its business. The primary function of moving those fluids which are undergoing any kind of transformation through other components of the plant such as furnaces, reactors, heat exchangers, and so on, make of the pumps …show more content…
With help of FMECA, potential failure modes as well as functional failures within a system and its equipment analyze mode of failure cause and effect, identifies potential weak links, and puts forward improvement measures. [1] The severity and probability indices are added together to yield the criticality index. It represents a measure of the overall risk associated with each combination of severity and probability. This method is commonly used in preliminary design when the failure probabilities are not …show more content…
Viscosity of liquid differs from design condition.

Type of Failures Symptoms

Potential Failure Bearing Failure Seal Leakage Shaft Cracks Pitting marks on impeller Misalignment
Table 1 Failure Mode Effect and Criticality Analysis [Reputed Manufacturing Company]
SNo. Components Function Function Failure Description Of Failure Failure Effect Failure Mode Failure Mechanism Detection Of Failure Local
1 Mechanical Seal Prevent leaking through shaft Leaking Leaking Leaking through seal Liquid dropping, noise from shaft -Fluid leakage
-Losses of pumping efficiency.
2 Bearing To bear and hold load from shaft in order to spin Wrong doing Worn out Shaft and seal will be broken Vibration and noise on pump -Excessive pump vibration
-Increased in shaft radial movement
-Eventual pump shutdown
3 Shaft Protect shaft from corrosion and erosion on stuffing box Eroded and corroded shaft Corroded Corroded Wrong doing -Vibration
- Possible bearing damage
-Eventual coupling failure
4 Impeller Flow the liquid Not able to flow fluid Worn out Decreasing pump capacity Decreasing pressure - Pump low efficiency
- Vibration
- Reduce in suction power

Table 2 Criticality Priorities Group
Group Criticality

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