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Instrument flanges, (sometimes called Bleed Rings or Sampling flanges), allow a means to measure pressure or obtain fluid samples from a pressurized flange connected line. The instrument flange provides a means of having threaded ports in the line without drilling and tapping the principle equipment in the line (The operator can replace the instrument flange if the threaded ports should become damaged or begin to leak). Instrument flanges commonly have 2, 3, or 4 ports.

The two common forms of instrument flanges, the drilled through type, and the double studded type, function interchangeability.

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