Metering-pump loss of prime, gas lock, flow error and pulsation
Use this when metering-pump loss of prime, gas lock, flow error and pulsation 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
0/33
- Answered
- 0
- To confirm
- 33
- Clues found
- 0
Load a test scenario
Next question
Phase 1 · Data validity
What is the state of the pump type, liquid end/diaphragm/plunger, valve, drive, stroke range, and as-installed configuration?
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-industry-standard-current · Hydraulic Institute · 2023ANSI/HI 7.1-7.5:2023 Controlled-Volume Metering Pumps
- A-industry-standard-current · Hydraulic Institute · 2024ANSI/HI 7.6:2024 Controlled-Volume Metering Pumps for Test
- A-industry-guideline-current · Hydraulic Institute · 2021ANSI/HI 7.8:2021 Controlled-Volume Metering Pump Piping Guideline
- A-industry-standard-reaffirmed · American Petroleum Institute · 2021API Standard 675, 3rd ed., Positive Displacement Pumps—Controlled Volume
- B-oem-operating-manual · ProMinent · 2022ProMinent gamma/X Solenoid Metering Pump Operating Instructions
- B-oem-technical-note · ProMinent · 2021Accurate dosing quantities even with outgassing media
- B-oem-technical-brochure · Grundfos · 2021Grundfos SMART Digital CHEMPAIRING Suite
- A-government-guidance · US EPA · 1999Alternative Disinfectants and Oxidants Guidance Manual
- A-government-training-guide · US EPA · 2019How to Conduct a Sanitary Survey of Drinking Water Systems
- A-government-design-manual · US EPA · 2010Nutrient Control Design Manual
- A-government-field-manual · US EPA · 1983Performance Evaluation and Troubleshooting at Metal Finishing Wastewater Facilities
- A-government-engineering-guidance · US Army Corps of Engineers · 1997USACE EP 415-1-261 Chemical Handling and Sludge Management
- A-government-safety · US OSHA · 2026Control of Hazardous Energy (Lockout/Tagout)
- A-government-safety · US OSHA · 2026Hazard Communication
- A-government-technical-guidance · US EPA · 1998EPA Compliance Assurance Monitoring Technical Guidance — Flow Pulsation