Pressure tapping method for orifice plate flow meters

This is called flange pressure tapping; the flange is a special type of flange (thicker) provided by the instrument manufacturer, not an ordinary flange with holes drilled in it

There are four types of pressure tapping for orifice plates: pipe tapping, flange tapping, corner tapping, and annular chamber tapping. (The standard statement is: three types, namely D and D/2, flange, or corner pressure taps.) Pressure tapping at the ring chamber is equivalent to corner tapping; each method of pressure tapping has its own advantages and disadvantages in terms of installation and use, though the differences are not significant. Flange drilling may be for pressure tapping on the flange, or it could actually be for corner tapping (the two are easily confused as both involve drilling holes in the flange). Since the way holes are made can affect measurements, there are specific requirements for drilling holes in flanges; it’s not possible to simply drill holes and use them as is. ↓ Pressure tapping on pipes and flanges ↓ Two forms of pressure tapping at corners ↓ Various illustrations of pressure tapping using orifice plates; pay attention to the pipeline structure on the flanges.

Pressure is taken from the flange, and that’s how the finished orifice plate is formed

This is flange-type pressure tapping; the manufacturer supplies it as a complete set when selling orifice plate flow meters. There is a short pipe provided on the flange, and during installation, the pressure tapping pipe simply needs to be connected to the transmitter, as shown in the diagram

Was this provided by the instrument manufacturer?