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.
ENGINEERING ANSWER UNITS
These product-specific answers retain the source evidence, calibration limits and conditions where a different measurement route is preferable. Values that cannot be confirmed from the approved source remain subject to project review or pending field test; no unverified value is supplied here.
Dataset v1.5.0; last reviewed 2026-08-24. Evidence IDs are retained in the translation dataset.
Replacement: For high-temperature, high-pressure steam and power-performance testing, a domestic flow nozzle can replace an imported nozzle such as an Emerson product; a long-radius nozzle can correspond to an imported PTC-6 power-test nozzle route. Use it when: The duty is main steam, feedwater or a PTC-6 steam-turbine performance test and high temperature, high pressure, erosion resistance and accuracy traceability matter. Do not force the substitution when: A general industrial duty prioritizes lower initial cost, low permanent pressure loss, low velocity in a small line, or extremely limited installation space; compare an orifice plate, Venturi or another route. Emerson is a trademark of its respective owner; this comparison uses public information available as of 2026-08, is not affiliated with the owner, and is not intended to disparage it.
COMPARISON REPLACEMENT · HIGH source confidence
Recommended application: For high-temperature, high-pressure steam or feedwater in continuous service where erosion resistance matters, select an ISA 1932 nozzle or long-radius nozzle as applicable. Confirm the nozzle type against pipe size, Reynolds number and pressure-tapping arrangement. Prefer another route when: Compare an orifice plate for a clean, single-phase general duty where structural simplicity matters; compare a Venturi where permanent pressure loss is critical; reassess other routes for low velocity in a small line or extremely limited installation space. Standards basis: ISO 5167-3:2022.
RECOMMENDATION COMPARISON · HIGH source confidence
Symptom: The reading remains high, fluctuates or disappears. Possible causes: Erosion of the nozzle profile, a blocked or leaking impulse line, trapped liquid, or a manifold or transmitter fault. For a long-radius nozzle, also inspect the welded connection. Action: Check the power supply, manifold and impulse system first. After isolating and depressurizing the line, inspect the nozzle profile and connections, repair or replace them to the inspection requirements, then re-zero and verify the range.
TROUBLESHOOTING · MEDIUM source confidence
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.