Abstract: A process to access a plate carrier having an orifice plate and carrier plate seal and an orifice fitting. The process includes moving the plate carrier from a pressurized orifice body lower chamber to an orifice body upper chamber. A seal ring is sealed in the upper chamber against the plate carrier to create a fluid type seal between the upper body chamber and the plate carrier. Pressure is bled off in the upper chamber to the atmospheric pressure. An entry plug threadably connected to a retainer is unscrewed and a crank removed to allow access to the orifice plate and to the carrier plate seal. The crank and entry plug are replaced and the upper chamber is repressurized. The seal ring may then be loosened from the plate carrier before returning the plate carrier to the lower body chamber.

Abstract: An orifice fitting for measuring fluid flow therethrough which can be used for either single or dual chamber fittings. The orifice fitting includes a plate carrier having an orifice plate receivable in the plate carrier. The orifice plate has a single preferred fluid flow direction. A double circular shoulder in the plate carrier includes a first shoulder and a concentric second shoulder having a larger diameter than the first shoulder. The double shoulder mates with a circular recess on the orifice plate to properly orient the plate for the preferred fluid flow direction.

Abstract: An orifice fitting for measurement of fluid flow therethrough. The orifice fitting includes a plate carrier having an orifice plate and carrier plate seals. The plate carrier may be moved between an upper chamber and a lower chamber. The upper chamber includes a pair of opposed seal rings, each of which is independently tightenable against the plate carrier. At least one removable entry plug in the upper chamber allows access to the plate carrier, the plate and the seals without the necessity of interrupting or disabling fluid flow through said lower chamber.

Abstract: An adjustable orifice fitting carrier assembly for an orifice fitting having a receptacle and being interposed in a pipeline. The carrier assembly includes a carrier body receivable in the receptacle of the fitting to hold a flat, circular orifice disc having a center orifice therethrough, the orifice disc being perpendicular to the flow through the pipeline. A carrier holding plate is receivable in the receptacle and is in communication with the carrier body. An adjustment mechanism is provided to move the carrier body and the orifice disc in a first direction across the diameter of the pipeline while within the orifice fitting. An adjustment mechanism is also provided to move the carrier body and the orifice disc in a second direction across the diameter of the pipeline, perpendicular to the first direction, in order to concentrically align the center orifice with the axis of the pipeline.