Solving the Partially Filled Pipe Dilemma: Advanced Electromagnetic Measurement Without Flumes

In municipal sewage networks, rainwater drainage, and industrial gravity discharge lines, fluid flows naturally without external pressure. As a result, pipes are rarely 100% full. 

RBEF-P Series Partially Filled Pipe
Magnetic Flow Meter

For plant engineers and environmental managers, measuring volumetric flow under these conditions has historically been a major challenge:

  • Standard Magnetic Flow Meters require a completely full pipe (100% liquid volume) to maintain a stable magnetic field and signal. When air is present, standard magmeters generate extreme errors or fail entirely.
  • Open Channel Weirs and Flumes (like Parshall flumes) require extensive site construction, take up large footprints, and tend to trap solids, sludges, and debris—demanding frequent cleaning.

The RBEF-P Series Partially Filled Pipe Magnetic Flow Meter from R&B Instrument Inc. overcomes these limitations by measuring flow velocity and liquid level simultaneously inside an enclosed pipe section.

1. How It Works: 

  • The Velocity-Area MethodInstead of assuming a constant cross-sectional area, the RBEF-P Series continuously measures two critical variables:Liquid Level (h): Built-in level sensors accurately determine the instantaneous height of the liquid inside the pipe.
  • Flow Velocity (v): Electromagnetic coils and multi-pair electrodes calculate average fluid velocity using Faraday's Law of Electromagnetic Induction.

By multiplying the real-time cross-sectional wetted area A(h) by the flow velocity v, the integrated transmitter calculates accurate volumetric flow:  Q = A(h) in real time, even when the liquid level fluctuates significantly.

2. Key Operational Benefits for Wastewater & Gravity SystemsMassive Infrastructure Savings: 

  • Eliminates the need to construct concrete drop structures, weir boxes, or flume channels.
  • Zero Maintenance & Self-Cleaning: The smooth, obstruction-free lining prevents rags, grit, and solids from catching or accumulating.
  • Continuous Measurement Across Flow States: Seamlessly transitions between partially filled gravity flow and full-pipe pressurized conditions without loss of data or calibration errors.

3. RBEF-P Series Technical Specifications: 

RBEF-P Series Partially Filled Pipe Magnetic Flow Meter 

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