Flow Nozzle Specifications

Flanged Flow Nozzles
Flanged flow nozzles are constructed with a mounting flange in line with the contoured upstream face. The mounting flange is sandwiched between the end-user’s pipe flanges to hold and seal the flow nozzle inside of the process piping. The mounting flange can be provided with a raised gasket face or RTJ groove, as required. Every flanged flow nozzle has a precision-machined shoulder to help assure its concentricity with the adjacent pipe.

The Wyatt Engineering Flanged Flow Nozzle is installed between pipe flanges when the customer/end-user is providing the taps for the upstream and downstream pressure sensation. The flow contour is machined to ASME
or ISO specifications and a shoulder is provided on the downstream side of the mounting flange to center the nozzle within required tolerances.

Note that the high pressure tap is nominally placed one pipe inside diameter (D) upstream from the nozzle face and the low pressure tap is located one-half a pipe diameter (D/2) downstream from the nozzle face. Given this tapping
configuration, several combinations of line size and flange geometry may preclude proper tap placement or violate certain piping and pressure vessel codes. Inform your Wyatt Engineering representative if this is the case, and we will provide special designs to solve the problem.

The Wyatt Flanged Flow Nozzle with Integral Low Pressure Tap is provided with the downstream tap integral to the nozzle’s mounting flange. This design
provides the same ASME or ISO flow contour, but can be used in smaller pipe sizes where the low pressure tap may interfere with the pipe weld, flange, and/or flange bolting. The low pressure connection is typically 1/4" NPT (6 mm)
unless specified otherwise.

Weld-In Flow Nozzles
Wyatt Engineering’s Weld-In Flow Nozzle is used where pipe flanges are not or cannot be used, such as in high pressure and/or high temperature applications in power plant installations. This flow nozzle design has a small mounting

flange designed to fit between beveled ends of the inlet and outlet pipe section. The pipe sections are then welded together with the nozzle in place.

The weld-in flow nozzle design can be provided as a special Mounting Ring Flow Nozzle that eliminates the need for welding dissimilar metals in the field. Note that pipe wall pressure taps are used with this nozzle design and
that it is available in complete flow metering section.

For special applications and in smaller line sizes, Wyatt Engineering provides a Weld-In Flow Nozzle with Integral Metering Taps. This design may include a short section of upstream and downstream pipe with flanged, beveled, or socket-weld ends.

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