Orifice flange it indicates the existence of Orifice plate. Details such as Tag NO Orifice ID Pipe ID Plate Material are stamped on one side of the tag plate which faces upstream side of the pipe line. Outside diameter of the orifice plate equals to PCD-1 Bolt Dia. This ensures the concentricity with the main pipe line. The other method to maintain the concentricity is by using sleeves on the bolts or by providing dowel pins on the Orifice Flanges.
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Louis Wadi, Thane, Maharashtra