Abstract: The present invention is directed to a venturi arrangement for use in measuring the flow rate of a fluid passed through a pipe bearing a venturi wherein the drawbacks associated with prior configurations have been ameliorated. The novel venturi arrangement comprises a pipe having a diameter, D, supplied in two sections, an upstream section and a downstream section, each of which preferably is flanged. Each of these pipe sections is fitted with a pair of pressure taps. A venturi comprising an annulus of diameter, D, has edges which are welded to said pipe sections to form an integral, fluid-conveying unit. A curvilinear conveying inlet section is integrally formed with the annulus. A throat section is integrally formed with the curvilinear conveying inlet section and contains a pair of pressure take-off apertures, each of which is connected by a flexible line to the downstream pipe pressure taps. Finally, a diverging diffuser section is integrally formed with the throat section.