Centrifugal pumps troubleshooting map Process Equipment troubleshooting serial Tip summary • The objective of this serial is to provide engineers with easy to use root cause analysis maps that can help them to easily troubleshoot the plant equipment and restore the equipment quickly to the good operating condition to save energy & cost. • In this video we will talk about liquid moving devices especially centrifugal pumps troubleshooting. • Centrifugal pumps major problems root causes can be summarized in the following points 1. No liquid delivery possible causes: • Instrument error and it need to be checked. • The pump is not primed properly. • Could be due to cavitation and we need to check the operation parameters and pump internals. • Could be due supply tank is empty and we need to check the level before operating the pump. 2. Liquid low flow possible causes: • Instrument error and it need to be checked. • Could be due to cavitation and we need to check the operation parameters and pump internals. • Could be due to presence of non condesibles (air or other gases). • Could be due to blockage of suction strainer. 3 Intermittent operation Discharge pressure high possible causes: • Could be due to cavitation and we need to check the operation parameters and pump internals. • The pump is not primed properly. • Could be due to presence of non condesibles (air or other gases). 4 Discharge pressure low possible causes: • Instrument error • Could be due to presence of non condesibles (air or other gases). • The pump speed is low (check the variable speed drive control) • Wrong direction of the installed impeller. 5 Excessive power demand possible causes: • The pump speed is too high (check the variable speed drive control) • High liquid density due to change in temperature conditions or contamination. • Change in system head due to modifications. • High viscosity due to change in temperature. My blog: www.360proactiveengineer.com #Energy #energyefficiency #energymanagement #steam #sustainable #sustainability #engineering #engineer #chemicalengineering #Environment #360practiveengineer #Energy savings #troubleshooting #fan #compressors #rootcauseanalysis #centrifugalpumps #pumps

1. 2.1 Centrifugal pump
troubleshooting map

2. Common symptom

3. No liquid delivery Possible cause
Instrument error
Not primed
Cavitation
Supply tank empty.

4. Liquid flow-rate low Possible cause
Instrument error
Cavitation
Non-condensibles in liquid
Inlet strainer clogged.

5. Intermittent operation Possible cause
Cavitation
Not primed
Non-condensibles in liquid.

6. Discharge pressure low Possible cause
Instrument error
Non-condensibles in liquid.
Speed too low
Wrong direction of rotation (or impeller in
backwards if double suction).

7. Power demand excessive Possible cause
Speed too high
Density liquid high
Required system head lower than expected
Viscosity high.

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9. 2.1 Centrifugal pump
troubleshooting map
Common symptom
No liquid delivery Possible cause
Instrument error
Not primed
Cavitation
Supply tank empty.
Liquid flow-rate low Possible cause
Instrument error
Cavitation
Non-condensibles in liquid
Inlet strainer clogged.
Intermittent operation Possible cause
Cavitation
Not primed
Non-condensibles in liquid.
Discharge pressure low Possible cause
Instrument error
Non-condensibles in liquid.
Speed too low
Wrong direction of rotation (or impeller in
backwards if double suction).
Power demand excessive Possible cause
Speed too high
Density liquid high
Required system head lower than expected
Viscosity high.
Please share it with others and for more visit
www.360ProcativeEngineer.com