McMenon FPD320 flow nozzle

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The McMenon FPD320 flow nozzle is used for high-velocity flow measurement where erosion or cavitation would wear or damage an orifice plate. It does not rely on a sharp edge (that can degrade over time) for accuracy, therefore offering higher long-term accuracy, and it is often used for flow testing on steam-raising plant. The discharge coefficient of a flow nozzle is such that a nozzle can measure approximately 55% higher flow rates than an orifice plate with a similar beta ratio and design differential pressure.

The inlet profile is a quarter-ellipse with a cylindrical throat. The ellipse can have one of two aspect ratios (low or high), depending on the beta ratio. For a long radius nozzle, tappings are typically one pipe diameter (D) upstream and 1/2 D downstream of the inlet.

For a throat tap nozzle, the upstream tapping is in the pipework, 1 D from the inlet; the downstream tapping is within the cylindrical throat and the connection to it is on the circumference of the nozzle ring. The design conforms to ASME PTC-6, with the nozzle mounted within a run of pipework, the upstream section of which includes a flow straightening element. McMenon flow nozzles are available in designs for clamping between flanges (within the bolt circle), as weld-in units or mounted within pipe runs.

McMenon FPD320 flow nozzles are available in sizes from DN50 to DN600, and they are available in a wide range of materials to suit the process fluid and working conditions.