ISA 1932 Flow Nozzle

ISA 1932 Flow Nozzle

+/- 0.80% to 1.20% Uncalibrated Uncertainty
Liquids and Gases, Lower uncertainty

  • Line size: 2 to 20 inches
  • Head Loss % of Differential: 30 to 85, Beta Dependent
  • Recommended Minimum Pipe Reynolds Number: Must be greater than 20,000 for basic accuracy


The ISA 1932 flow nozzle is generally used for the measurement of liquid or gas flows including steam, erosive, high-velocity and non-viscous media. They do not rely on a sharp edge (which can deteriorate over time) to maintain accuracy and therefore offer excellent long-term accuracy with less wear, reducing the possibility of distortion. They are often used for high accuracy flow measurement in power plant applications.

The ISA 1932 flow nozzle is capable of measuring higher flow rates, often double, than an equivalent orifice plate at the same differential pressure. The flow nozzle is available in various designs including mechanically clamped between flanges or permanently welded directly into the pipe line.


Line Size
2 to 20 inches
Head Loss (permanent pressure loss) in % of Differential
30% to 85%, Beta Dependent
Basic Accuracy (% of Total)
[Calibrated +/- 0.25] [Uncalibrated β≤0.6= +/- 0.80%, β<0.6=+/- (2β-0.4)%]
Recommended Minimum Pipe Reynolds Number
Greater than 20,000 for basic accuracy
Required Straight Piping
Consult PFS for required US & DS piping based on your specific application
Beta Range
0.30 through 0.80
Useful Service Life
Medium to Long
Service Functional Limits
Clear Liquids, Gas and Steam
Power Generation, Hydrocarbon, Liquids, Gas Process, Water Treatment distribution, Oil production and refining, Steam Process, High Velocity Process, Erosive Fluids
Common Materials
Carbon Steel, Stainless Steel, Chrome Moly
Other Available Materials not limited to
Aluminum, Zirconium, Hastelloy, Monel, Duplex SS, Titanium, Tantalum
Several international standards govern use and design of flow nozzles, ASME, ISO and others. While they cover similar meter embodiments, design parameters and requirements, stated performance in key areas they may differ.

Support and Service

In addition to a wide range of differential producing Venturi flow meters, orifice plates, WedgeType™ flow meters, and open channel flow elements, PFS provides comprehensive, specialized services for new and existing flow meters, including rehabilitation, hydraulic analysis, and full engineering support.


ISO 9001, ASME S&U, PED Certified, CRN.

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