Corner taps

Fig. 7. Orifice plate pressure tap locations. A, corner taps B, flange taps C, D taps D, 1/2 D taps and E, pena contracta taps. See text.

Corner taps. Static holes drilled one in the upstream and one in the downstream flange, with the openings as close as possible to the orifice plate. 

Figure 6.15. (a) General arrangement (b) Orifice plate with corner tappings. Upper half shows construction... 

FIG. 10-16 Coefficient of discharge for square-edged circular orifices with corner taps. [Tuve and Sprenkle, Instruments, 6, 201 (1933).]... 

Corner taps Range taps D in inches) 0.5959-t0.0312p2>-0.184P 91.7ip2 5 0.75... 

The differential pressure depends on the location of the pressure taps. Pressure taps are located in four general arrangements as illustrated in Figure 4.14 flange taps, D and D/2 taps, comer taps, and pipe taps. Flange taps are typically placed on the pipe flange and are located 1 inch upstream and 1 inch downstream from the face of the plate to centerline of the tap. The D and D/2 taps are located one pipe irmer diameter upstream and one-half downstream from the face to the flange. Corner taps are located at the face of the orifice plate. Pipe taps are located 2.5 pipe irmer diameters upstream... 

The discharge coefficient is determined from laboratory experiments and varies with tap arrangement and diameter of pipe and orifice plate. For example, the discharge coefficient, C, for an orifice plate with corner taps is... 

Can be used with corner taps, flange taps, or radius taps. 

Corner taps. Comer taps are located such that the tap holes break through the wall flush with the faces of the meter plate. The discharge coefficient for corner taps is ... 

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