Centrifugal-pump flow, head and efficiency decline
Use this when centrifugal-pump flow, head and efficiency decline is observed but the cause remains unclear. The diagnostic checks measurement and sampling, operating changes, issue location, and key evidence before suggesting likely causes and the next useful check.
First time here? Start with this
You do not need every data point before you begin
The system asks one discriminating question at a time and updates the candidate causes on the right. Answer from current facts; choose unknown or defer a question when the evidence is not available.
- 1
Confirm the issue
Check whether the symptom is reproducible and whether the measurement or observation is reliable.
- 2
Narrow the causes
Continue through operating changes, issue location, and available inspection results.
- 3
Read the live result
Candidate causes, support, counter-evidence, conflicts, and next actions update as you answer.
This tool analyzes information you already have. It does not insert a safety screen or use safety status to stop the diagnosis. If an alarm, leak, or injury is happening now, follow the site emergency procedure directly.
Automatic troubleshooting · Selections are not uploaded
Only one question is shown at a time. Answer from current facts or defer an unknown item. Possible causes and next checks update on the right as you answer.
- 1Data validity
- 2Operating changes
- 3Issue location
- 4Further confirmation
Question progress
0/34
- Answered
- 0
- To confirm
- 34
- Clues found
- 0
Load a test scenario
Next question
Phase 1 · Data validity
What are the specific speed, impeller, and liquid conditions for the manufacturer/acceptance Q-H-Power-Efficiency curve?
The system asks the question most useful for separating possible causes. Unknown or deferred items are not treated as the opposite conclusion.
I have more test or inspection resultsOptionalAdd laboratory analysis, normalized calculations, or checks completed by trained personnel when available. These fields are optional.
View rule sources (15)Standards, regulations, OEM material, and peer-reviewed literature used to audit the diagnostic logic. You do not need to read them before starting.
Each rule cites material directly relevant to its judgment. Current OEM and site procedures remain controlling.
- A-government-current-portal · US Department of Energy · 2026Pump Systems
- A-government-technical-sourcebook · US Department of Energy · 2006Improving Pumping System Performance: A Sourcebook for Industry
- A-government-tip-sheet · US Department of Energy · 2005Test for Pumping System Efficiency
- A-government-tip-sheet · US Department of Energy · 2005Maintain Pumping Systems Effectively
- A-government-tip-sheet · US Department of Energy · 2005Match Pumps to System Requirements
- A-government-assessment-tool · US Department of Energy · 2026MEASUR Pump System Assessment
- A-industry-standard-definitions · Hydraulic Institute · 2026Pump and Pump System Definitions
- A-industry-standard-technical · Hydraulic Institute · 2026Pump Curves and Affinity Rules
- A-industry-standard-technical · Hydraulic Institute · 2026Combined Pump and System Curves
- A-international-standard · ISO · 2012ISO 9906:2012 Rotodynamic Pumps — Hydraulic Performance Acceptance Tests
- A-international-standard · ISO · 2019ISO/ASME 14414:2019 Pump System Energy Assessment
- A-government-application-guidance · US EPA · 2000Wastewater Technology Fact Sheet: In-Plant Pump Stations
- A-government-model-manual · US EPA · 2020EPANET 2.2 User Manual
- A-government-engineering-manual · US Army Corps of Engineers · 2020EM 1110-2-3105 Mechanical and Electrical Design of Pumping Stations
- A-government-safety · US OSHA · 2026Control of Hazardous Energy (Lockout/Tagout)