Primary Flow Signal, Inc.

The ASME PTC-6 flow nozzle is a specialized differential pressure device designed to deliver the highest accuracy and repeatability required for steam turbine efficiency testing under the ASME PTC-6 Performance Test Code. Primary Flow Signal supplies PTC-6 nozzles as complete assemblies, including integrated upstream and downstream pipe spools, a flow conditioner, and an optional nozzle outlet diffuser cone to significantly reduce permanent pressure loss. PFS PTC-6 flow nozzles are always calibrated and guaranteed to meet the stringent laboratory calibration criteria necessary for turbine performance testing. Because PTC-6 applications carry high risk if calibration requirements are not met, PFS calibrates each unit independently at a leading high Reynolds number facility and provides the documentation needed to support defensible test results. PFS also specializes in the refurbishment of nozzle runs for existing installations.

The ASME PTC 19.5 throat tap flow nozzle from PFS is engineered for high-accuracy differential pressure flow measurement in demanding, high-velocity services. It is widely used for steam turbine efficiency testing in accordance with ASME PTC 6, while also supporting broader power and process applications that require precise, repeatable measurement without the full burden of formal performance test requirements. A key advantage of the throat tap nozzle is flexibility. A standard ASME throat tap nozzle can be applied outside of turbine test scenarios while still delivering high-accuracy flow measurement. It can be manufactured and processed to match PTC 6 expectations when needed, yet calibration, upstream and downstream spools, and other test-related components are optional depending on the application. This allows teams to balance accuracy targets, installation constraints, and project budgets while maintaining a code-aligned nozzle design.