ISA 1932 Flow Nozzle
± 0.80% to 1.20% Uncalibrated Uncertainty
Liquids & Gases, Lower Uncertainty
- Line Size: 2” to 20”
- Head Loss % of Differential: 30% to 85% beta dependent
- Recommended Minimum Pipe Reynolds Number: Must be greater than 20,000
ISA 1932 Flow Nozzle for High-Velocity, Long-Life Differential Pressure Measurement
The ISA 1932 flow nozzle is a differential pressure primary element designed for accurate measurement of liquids, gases, and steam, especially in high-velocity and erosive services. Unlike an orifice plate, the ISA 1932 nozzle does not rely on a sharp edge to maintain performance, which helps reduce wear-related accuracy drift and supports more stable long-term results in demanding applications.
The ISA 1932 nozzle can often measure higher flow rates than an equivalent orifice plate at the same differential pressure, making it a strong fit for power and process systems where capacity, durability, and repeatability matter. It is available in multiple installation configurations, including mechanically clamped between flanges or permanently welded into the pipeline, depending on project requirements.
Key Benefits & Features:
- Improved Uncalibrated Uncertainty: Lower uncalibrated uncertainty compared to an equivalent ASME long radius nozzle.
- Long Service Life: No moving parts and a robust geometry support medium to long service life.
- Erosion Resistance: Lower susceptibility to erosion compared to sharp-edged devices.
- High-Velocity Capability: Well-suited for high-velocity flow measurement in steam, gas, and clean liquid service.
- High-Temperature and High-Pressure Utility Fit: Widely used in steam and water service for power and utility systems.
- Strong Repeatability: Repeatability of ±0.1% supports stable measurement and control.
- Broad Operating Range: Turndown of 10:1, 20:1, 50:1 and higher depending on meter design and secondary instrumentation.
- Flexible Installation Options: Available as between-flange or welded-in configurations to match piping and project constraints.
The ISA 1932 flow nozzle is commonly applied in power generation and steam systems, oil production and refining, chemical and petrochemical processing, water treatment and distribution, and other high-velocity process services involving clean liquids, gases, steam, or erosive media.
Cast Iron/Ductile Iron Venturi Flow Meter Specifications
Uncalibrated: β≤0.6 = ±0.80%, β<0.6 = ± (2β-0.4)%
Greater can be achieved depending on the specific model and design of the meter as well as the type of secondary instrumentation system utilized
ISA 1932 Flow Nozzle Model Types
Model Types
- NZF – Nozzle Flanged
- NZFFR – Flanged Nozzle, Flanged Run
- NZW – Nozzle Weld-In
- NZWWR – Nozzle Weld-In, Welded Run
ISA 1932 Flow Nozzle Materials
Typical material selections for standard applications:
- Carbon Steel
- 304/316 Stainless Steel
- Chrome Moly
Other options for material selection:
- Aluminum
- Zirconium
- Hastelloy B&C
- Monel
- Duplex SS
- Titanium
- Tantalum
ISA 1932 Flow Nozzle Certifications
PFS is a contributor to various international standards committees, fully supporting our staff’s memberships to these commissions.
Individual products follow relevant industry regulations, including requirements specific to the oil and gas, water/wastewater, and power generation industries.
Flow nozzle design and application are governed by several international standards, including ASME and ISO. While these standards cover similar nozzle configurations, specific design requirements and stated performance criteria can vary by standard.
PFS maintains the following certifications, standards & compliances:
- ISO 9001
- AGA
- ASME S & U
- API
- ANSI
- European Pressure Equipment Directive (PED)
Applications
Power Generation & Steam Systems
ISA 1932 flow nozzles are widely used in power plants for steam and water measurement in high-pressure, high-temperature service. Their durable profile supports reliable performance in boiler feedwater, turbine steam, and other demanding energy applications.
Oil, Gas, & Refining
In upstream production and refining environments, ISA 1932 flow nozzles measure hydrocarbons, liquids, and gases under high-velocity conditions. Their robust design performs well in services where erosion and sustained flow rates are concerns.
Water Treatment & Distribution
ISA 1932 flow nozzles are used in municipal and industrial water systems where clean liquids and consistent measurement are required. Their repeatable performance supports stable process control in treatment and distribution applications.
Chemical & Petrochemical Processing
Chemical and petrochemical facilities apply ISA 1932 flow nozzles for accurate measurement of clean liquids and gases in process systems. Their ability to handle high Reynolds number flow makes them well-suited for high-rate industrial operations.
ISA 1932 Flow Nozzle Expertise From PFS Since 1983
Four Decades of Flow Measurement Experience
PFS has over 40 years of experience designing and supporting differential pressure flow elements for demanding steam, gas, and clean liquid service. Our ISA 1932 flow nozzles are trusted in high-velocity and erosive applications where durability and repeatable performance matter.
Engineering Support for High-Velocity and Severe Service
From nozzle sizing and beta selection to tapping details and installation guidance, PFS helps ensure your ISA 1932 nozzle performs as intended. Our team supports power, hydrocarbon, and process facilities that require stable results under high-pressure, high-temperature, and high-flow conditions.
In-House Fabrication and Calibration Support
PFS provides end-to-end manufacturing and quality control, with calibration support available when tighter uncertainty or defensible documentation is required. We deliver jobsite-ready nozzle solutions, along with technical support, to reduce installation risk and measurement uncertainty.
