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Accuracy
For pipe Reynolds numbers greater than 75 000 and a normalized
piping configuration, the Wyatt 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 Venturi Tube
is shown in Figure 1.
Beta Ratio
Wyatt 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
Venturi Tube means reduced pumping costs. The Wyatt Venturi
has a shorter laying length and exhibits better recovery than typical
classical and modified venturi meters.
Design Concepts: The Wyatt 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 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 Venturi Tubes operate with
minimal headloss. This results in less energy consumption, lower
operational costs, and a lower cost of ownership.
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