What is Flange Taps

 Flange Taps 

Flange taps are the most widely used pressure tapping location for orifices. They are holes bored through the flanges, located one inch upstream and one inch downstream from the respective faces of the orifice plate. A typical flange tap installation is shown in below Figure.

The upstream and downstream sides of the orifice plate are connected to the high pressure and low-pressure sides of a DP transmitter. A pressure transmitter, when installed to measure flow, can be called a flow transmitter. As in the case of level measurement, the static pressure in the pipe-work could be many times higher than the differential pressure created by the orifice plate. In order to use a capsule that is sensitive to low differential pressure, a three valve manifoldhas to be used to protect the DP capsule from being over ranged. The three valve manifold is discussed in more detail in the  level measurement.

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