High Air Flow Test Stand SystemProduct Summary

The High Flow Air Test Stand is an air flow measurement system specially designed for highly accurate and repeatable measurement at a wide range of flowrates. It measures air flow for large aircraft and land-based, gas turbine parts, and meets a wide range of component flow range air testing needs of OEMs and their suppliers.

Key Features
  •  Low Uncertainty (±0.29%)
  • Highly repeatable results (±0.15%)
  • Wide range of part test pressures and mass flow rates
  • Highly customizable controller software for test automation and data management
  • Up to 2 outlet ports
Related Products for Measuring Different Flow Ranges

The High Flow Air Test Stand is one in a series of air flow test stands designed for the aircraft, aeroderivative and IGT turbine engine-based component industries. These test stands are designed to provide complete, automated solutions for flow measurement.

For information on related products, read the Air Flow Test Stand Product Comparison.

Complies with OEM Test Specifications

OEMs and their suppliers worldwide require quality airflow measurement of passages in both aircraft and land-based turbine engine components. Each OEM has a unique testing specification and their suppliers must be flexible with the test procedures in order to comply with each OEM test specification. Accuracy, repeatability, throughput and availability are critical elements in the design of these test systems. These air flow test systems currently comply with the in-house testing procedures of ABB/Alstom Power, ABB Gas Turbines, Pratt & Whitney America, Pratt & Whitney Canada, General Electric Aircraft Engines (General Electric Infra, Aviation), General Electric Power Systems (General Electric Infra, Energy), Honeywell, Mitsubishi Power Systems, Mitsubishi Heavy Industries, Allison Engine, Rolls-Royce, Solar Turbines, Siemens, Siemens-Westinghouse, Snecma, and many others.

Traceable to NIST

All Flow Systems air test stand sonic nozzles and instruments (P&T) are traceable to National Institute of Standards and Technology (NIST).

System Specifications

The High Flow Air Test Stand is available three configurations:

ConfigurationAir Mass Flow RangeSonic Nozzle Diameter Range# of Sonic NozzlesTurndown

Standard 0.0005 – 0.9 lbm/sec 0.031″ – 0.707″ 10 1800:1
Option 1 0.001 – 0.9 lbm/sec 0.044″ – 0.707″ 9 900:1
Option 2 0.0005 – 2.0 lbm/sec 0.031″ – 1.000″ 11 4000:1

Additional Specifications

Specification Value(s)
Part Pressure Range 1.0 – 20.0 psig, 0.25 – 30 psig optional, custom range available
Part Pressure Ratio Range 1.07 – 2.36, 1.02 – 3.0.4 optional, custom range available
Uncertainty ±0.29% of reading, NIST traceable
Repeatability Less than ±0.15%, as defined as 2 standard deviations divided by the mean of 20 identical samples.  Included in uncertainty above and may encompass effects from air supply, flow bench, plenum and connecting volume and part.
Cycle Time 20 – 60 seconds, capacity dependent
Flow Ports Connections – Low Flow 2.5″ Sanitary Flange
Flow Ports Connections – High Flow 6.0″ Sanitary Flange
Pressure Connections 1/4″ (-4) Swagelok Instrumentation Female Quick Connectors QC series, color keyed
Dimensions 65″ H x 62″ W x 36″ D
Weight 1,000 pounds

For additional information on system specifications, refer to the Test Stand Capabilities.

Uncertainty Analysis

Per the ISO Guide to Uncertainty in Measurement (GUM).  Contact Flow Systems for more detailed information.

Built with Commercial Off-The-Shelf (COTS) Components

All Flow Systems air flow test system designs, the test system controller, data acquisition and control subsystems, and all instrumentation are standard and readily available Commercial Off-The-Shelf (COTS) items. This ensures that service or replacement of any item can be achieved in a timely manner, providing for high availability of our products. When applicable, this includes all of the Unit Under Test related instrumentation specified by the customer.


National Instruments LabVIEW Logo
Control System Operator Interface

The system controller software handles the opening and closing of sonic nozzle flow paths, sets the proper pressure at the inlet of the Unit Under Test and calculates the mass flow through the sonic nozzle manifold. The controller also monitors the airflow conditions to ensure the sonic nozzles are in a “choked” state and that the flow is stable within ±0.1% of the pressure ratio set point. Controller software is written using National Instruments LabVIEW™.

Report Live Data and Compare to Historical Data
  • On-screen tabular and graphical results are displayed in real-time
  • Variety of user-customizable reports
  • Allows the operator to read all system sensors, read status and error messages
Schedule Single Test or Multiple Test in Series
  • Allows any number of configured tests to be executed in a sequence
  • Virtual tests can be programmed to calculate and evaluate results based on previous test values in algebraic equations
  • Programmable pause– operator can add a pause between tests for part modification or setup before starting the next test
Plenum/Fixturing Diagnostics
  • P3 static and total control
  • Fixture restriction
Customize Controller Software and Integrate Data
  • Controller software can be customized to fit a wide variety of customer needs
  • Data can be integrated with customer’s local databases and/or information systems
Data Storage Formats
  • Standard storage format is SQL database
  • Customized data storage options available
Determines Test Measure Value Ranges of a Part
  • Allows the operator determine the “test measure” or flow value without knowing anything about the part other than the test setpoint
  • Used primarily for research and development to determine the test measures of a new or test part
  • Sets an upper and lower acceptance limit based upon the measured value and a user defined tolerance
Tests and Suggests Proportional-Integral-Derivative (PID) Parameters
  • The system flows the Unit Under Test and uses the natural response of the system to calculate Proportional-Integral-Derivative (PID) parameters
Monitor Performance using Statistical Process Control (SPC)
  • SPC features provide the customer a method for monitoring the performance of the Unit Under Test in real-time and in relation to previous production parts to identify variations in the part production process
  • Develop and manage flow test configurations in conjunction with shop floor controlling information system
  • SPC features can be customized to suit customer’s quality control criteria
Determine Average Value & Repeatability of Master/System Unit Under Test
  • Measures the repeatability, average and percent difference (measured and calculated) of a series of consecutive flow tests through a master part test
  • Allows the flow results of a master part to be included in the test report for other production parts, which allows the repeatability of the test bench to be monitored over time
  • Performs test stand audits by measuring the repeatability, average and percent difference of a calibrated master sonic nozzle against the installed system nozzles
Measure Static Pressure at a Single Hole (Pressure Probing)
  • Operator can measure the internal static pressure gradient in a part
  • Allows increased resolution for the operator to understand what the static pressure ratio is at a single hole in a part
System Uncertainty Check
  • Measures the repeatability, mass flow and percent difference of a calibrated master Sonic Nozzle against one or more installed system Sonic Nozzles.
Troubleshoot & Diagnose System and Part Leaks
  • Leak Test Diagnostics: Test the system and attached customer part fixtures for leaks
  • Critical Flow Venturi (CFV) Valve Leak Check Diagnostics: Determine the seal integrity of the CFV valves
  • Manifold Leak Test Diagnostics: Determine the leakage of internal test stand pressure manifolds to ensure integrity of test stand
  • Data Acquisition Device Diagnostics: Self-check to determine status and communication with data acquisition hardware and instrumentation
Troubleshoot Issues Using Internet-based Support – Optional
  • After connecting the test stand to the internet, receive technical support from Flow Systems
Facility Requirements

The facility requirements below are to be supplied by the customer at the installation site.

Electrical Power: 100 – 240 VAC / 50 – 60Hz / 1pH, 7.5 – 15Amp
Inlet Air Connection: 2″ 150# ANSI Flange
Pressure Range: 70 – 120 psig
Temperature Range: 60° – 90°F
Particulates: < 5 microns
Oil Content: < 10 ppm
Pressure Dew Point @ >100 psig: < 39°F

Flow Rate: Equal to the lesser of the maximum capacity of the flow bench or the requirement of the largest part for a 100% duty cycle. An air receiver will allow for maximum flow at less than 100% duty cycle.

Photos & Schematics

Additional Software Screenshots

The following are pictures and schematics of the High Flow Air Test Stand.

High Flow Air Test Stand with Optional Vane Plenum Cart

High Flow Air Test Stand with Optional Vane Plenum Cart

Side Ports

Side Ports

High Flow Air Test Stand Schematic

Download / View Schematic as High Flow Air Test Stand Schematic


The following is a list of options available for this test stand:

  • Larger regulators for ultra high flow
  • Software customization including database integration, networking, SPC (Statistical Process Control) and more
  • Custom Fixturing Options
  • Compressors, dryers, filters and receivers
  • On-site installation, training, commissioning and upgrades
  • Heat exchangers and Dewpoint alarm
  • Silencers
System Check Standards

The following optional additions are available to monitor the ongoing system accuracy and can also be used to diagnose problems: