High-pressure steam and high-velocity service
ISO 5167-3 ISA 1932 and long-radius flow nozzles engineered for steam, feedwater, gas and demanding high-pressure service.
Integrated Flow Nozzle Meter for Steam Service
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Shizhong supplies ISA 1932 and long-radius nozzle primary elements as integrated, weld-in or flanged meter runs from DN50 to DN600. DN50–DN300 is within the LG series type-approval scope; DN300–DN600 is individually flow calibrated. Each meter is sized to the selected ISO 5167-3:2022 geometry, operating Reynolds-number range, pressure-tap arrangement, pipe condition and project mechanical code.
Final specifications are confirmed against process data, piping, material, pressure class, applicable code and metrology requirements.
ISO 5167-3:2022 ENGINEERING BASIS
ISO 5167-3:2022 covers several distinct geometries. Shizhong's principal offering combines the ISA 1932 nozzle for standards-based steam, gas and liquid measurement with the long-radius nozzle for demanding power-service duties. Geometry, pressure taps, Reynolds-number limits and discharge-coefficient uncertainty must follow the selected family; they are not interchangeable.
Smooth ISO profile with corner pressure taps. Standard envelope: D 50–500 mm, β 0.30–0.80 and ReD up to 1×10⁷. The lower Reynolds-number limit is 7×10⁴ for 0.30≤β<0.44 and 2×10⁴ for 0.44≤β≤0.80.
ISO relative Cd uncertainty: 0.8% for β≤0.60; (2β−0.4)% for β>0.60.
Quarter-ellipse inlet profile with D and D/2 pressure tapping. Standard envelope: D 50–630 mm, β 0.20–0.80 and ReD 1×10⁴–1×10⁷. It is available as a welded or flanged meter run for high-pressure, high-temperature service.
ISO relative Cd uncertainty: 2.0% without individual calibration.
Full-pipe, single-phase, subsonic and non-pulsating flow is required for the ISO coefficient basis.
Straight run is selected from ISO 5167-3 Table 3 for the actual β and upstream disturbance—not from one universal D value.
Pressure class, wall thickness, welding, NDE and high-temperature material are confirmed against the project piping code.
Use a documented calibration when geometry or operation is outside the applicable ISO envelope, or when lower uncertainty is required.
A project target such as ±0.5%–1.0% of rate applies only to an engineered or calibrated meter system. It is not the universal ISO discharge-coefficient uncertainty. Total installed uncertainty also includes differential pressure, density, dimensions, pressure/temperature compensation, piping and commissioning effects. Dirty, two-phase, flashing or pulsating service requires a separate engineering and calibration review.
Request a detailed datasheet with dimensional drawings, material certificates and ordering information for Flow Nozzles.
Production and documentation schedules are confirmed in the quotation after technical review and drawing approval.
Send your process data for an engineering review and a project-specific next step.