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Common problems and solutions for metering pump piping systems

Problem 1: Excessive Flow Without Outlet Pressure

  • Issue: When there is no outlet pressure, the actual flow rate exceeds the rated flow rate, and adjusting the flow has little effect.
  • Solution: Install a back pressure valve at the pump outlet. This stabilizes the flow rate and pipeline pressure, ensuring metering accuracy.

Problem 2: Outlet Piping Vibrations

  • Issue: Significant vibration occurs in the outlet piping when the pump starts.
  • Solution: Install a pulsation dampener at the pump outlet. When there is no outlet pressure, combine it with a back pressure valve. This mitigates the pulsating impact caused by the sudden acceleration of fluid, reducing pipeline vibration.

Problem 3: Flow Instability or Inability to Discharge Fluid

  • Issue: Fluid cannot be discharged, pressure cannot increase, or flow is unstable.
  • Solution: Common causes include a damaged diaphragm, blocked pipeline, or impurities preventing valve sealing. Install a filter to prevent impurities from entering and blocking the pipeline.

Problem 4: Self-Flow or Siphoning

  • Issue (a): Liquid flows from the pump head after stopping due to the storage tank's liquid level being higher.
  • Issue (b): Siphoning occurs during dosing.
  • Solution: Install a back pressure valve at the outlet to prevent self-flow and siphoning by maintaining consistent outlet pressure.

Problem 5: Pressure Fluctuations Affecting Accuracy

  • Issue: Large pressure fluctuations at the outlet affect metering accuracy and precision instruments.
  • Solution: Install a pulsation dampener near the pump outlet, preferably with a back pressure valve. A properly sized pulsation dampener reduces over 90% of pulsations, ensuring smooth fluid flow.


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