Measuring and testing – Volume or rate of flow – Using differential pressure
Patent
1996-05-23
1998-04-07
Chilcot, Richard
Measuring and testing
Volume or rate of flow
Using differential pressure
G01F 146
Patent
active
057366519
ABSTRACT:
A high temperature gas flow sensing element is disclosed having a housing with similar internal dimensions as the fluid conduit, whether round or rectangular. An interior flow conditioner is affixed at the inlet of the flow element. A total pressure sensing pitot tube array is affixed traversing the interior cross sectional area of flow element for sensing the total pressure of fluid flowing into the flow element, and a static pressure sensing pitot tube array is also affixed traversing the interior cross sectional area of the flow element for sensing the average static pressure within the flow element. The pitot tubes and pressure sensing tubes are affixed at four places, two shell penetrations and two places at the manifolds, regardless of manifold design or the element shape. To prevent material stress and fatigue and leakage that can result from the different expansion rates of differing materials under high gradient temperature cycling, a high temperature packing, such as a ribbon packing or packing ring made of pliable material resistant to high temperatures, is used in place of the ferrule portion of a compression nut and fitting arrangement. Exterior first and second instrument taps are provide for connection of each array respectively to a differential pressure instrument for indicating flow rate and/or transmitting a flow rate signal. Further, exterior array access ports are provided to permit cleaning of each pitot arrays should they become plugged with particulates.
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Artis Jewel
Chilcot Richard
Guguotta John D.
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