eFunda: Introduction to Pitot Static Tubes




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Pitot Static Tubes: Introduction


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Overview






A Pitot-static Tube is a flow
velocity meter which is capable of measuring fluid velocities as a
localized point (as opposed to an averaged velocity across a larger
section). A schematic of a Pitot tube is shown below.



Typical Pitot Static Tube
The Pitot tube yields a pressure measurement which is typically
measured with a differential manometer. The fluid velocity can
obtained from the pressure value in accordance with incompressible
(or compressble) fluid
theory.




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Pros and Cons










  •
Pros:

 
-
Simple construction.

 
-
Relatively inexpensive.

 
-
Almost no calibration required.


 
-
Induces minimal pressure drops
in the flow.

 
-
Requires only a few access
holes into the flow conduit; no wide open cut needed.



  •
Cons:

 
-
Accuracy and spatial resolution
may not be high enough for some applications.

 
-
Tube must be aligned with the
flow velocity to obtain good results. Any misalignment in yaw
should not exceed Ä…5°.

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