The most commonly used venturi tubes are of the ASME classical or Herschel style (Figure…
Pitot Tubes and Annubars
These devices are used for larger pipe sizes when the fluid (gas, steam or liquid) is clean.
For a pitot tube, the difference between the total (stagnation) pressure at the tip of the pitot tube and the static pressure outside the pitot tube follows the square-root relationship. Flow rates are thus measured.
An annubar is a multiple-ported pitot tube that attempts to provide the average velocity.
A typical pitot tube is shown in Figure 500-12. Figure 500-13 is a schematic of an annubar.
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