Wyatt - Model BVT -Venturi Tubes

The cast iron series is often used in municipal water and wastewater applications. Known for longevity of service with minimal maintenance, BVT meters are ideal for metering potable water, sludge, slurries, as well as gases and clean fluids. The Model BVT-C is uniquely designed for rate-of-flow control applications, while the BVT-S is designed to prevent clog-ging of the pressure taps for appli-cations with solids-bearing fluids.

Flow Measurement Accuracy
For pipe Reynolds numbers greater than 75 000 and with a normalized piping configuration, the Wyatt Venturi Tube provides a flow measurement accuracy of ± 0.50% without flow calibration. With independent flow calibration, Wyatt’s BVTs provide the user with ± 0.25% accuracy.

Accuracy
For pipe Reynolds numbers greater than 75 000 and a normalized piping configuration, the Wyatt-Badger Venturi Tube provides a flow measurement uncertainty of:

•  0.50% for standard meters and
•  0.25% for flow calibrated meters.

Pressure Loss
    The permanent pressure loss of the Wyatt-Badger Venturi Tube is shown in Figure 1.

Beta Ratio
         Wyatt-Badger Venturi Tubes are available with a wide range of diameter ratios (d/D). This provides users with accurate flow measurement over a broad range of flow rates for a given line size.

Temperature Range
         Cast iron BVTs can handle process temperatures between -20 °F and +350 °F (-30 °C and +175 °C).

Pressure Range/End Connections
         Flanged end connections per ANSI B16.1 for 125 PSIG and 250 PSIG service are available. A variety of other end connections is also available including: Mechanical joint flanges per AWWA C110 or C111, as well as plain-end designs.

Piping Requirements
         Designed for full-pipe flow, BVT flow meters may be mounted either horizontally or vertically. For recommended upstream piping, refer to Wyatt Engineering Technical Manual for the BVT.

Energy Considerations
          Figure 1 compares the headloss of the BVT design with that of other primary flow elements. The pressure recovery of the Wyatt-Badger Venturi Tube means reduced pumping costs. The Wyatt-Badger Venturi has a shorter laying length and exhibits better recovery than typical classical and modified venturi meters.

Design Concepts
           The Wyatt-Badger Venturi is designed to provide a high degree of accuracy with unquestionable and predictable performance. Key to this design is the following:

Accuracy: Static inlet and throat pressure sensation provides a highly accurate, stable, and predictable flow measurement signal for flow rates with pipe Reynolds numbers as low as 75 000.

Reliability: The Wyatt-Badger Venturi Tube is free of protrusions and sharp-edged, debris-collecting annuli. Static pressure taps reduce flow noise. The internal contour is designed to minimize the buildup of solids and deter erosion, corrosion, and scaling.

Energy Savings: Wyatt-Badger Venturi Tubes operate with minimal headloss. This results in less energy consumption, lower operational costs, and a lower cost of ownership

• High Accuracy
• Reliable Operation
• Energy Efficient
• Different Options for a Variety of Applications