ABSTRACT
In Figure 24.2(a) corner pressure tappings are shown at A and B. Alternatively, with an orifice plate inserted into a pipeline of diameter d, pressure tappings are often located at distances of d and d/2 from the plate respectively upstream and downstream. At distance d upstream the flow pattern is not influenced by the presence of the orifice plate, and distance d/2 coincides with the vena contracta.
