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You are here: Home / Technical / Orifice Plates

Orifice Plates

Orifice plates have long been used for measuring and metering airflow. Fixed orifices are used to measure airflow in laboratories and for balancing duct runs in industrial applications. Orifice plates are sized for a particular amount of airflow to pass through, given the upstream static pressure.

To be useful as a device for measuring airflow, an orifice plate is mounted in a tube with two pressure taps, one on the upstream side and one on the downstream side. This device is an airflow meter. The pressure tap nearest the fan is called the high pressure side, while the other tap is on the low pressure side. The difference between these two pressures is called the differential pressure and is a function of the amount of air mass flowing through the orifice. Usually, we don’t worry about air density (air mass per unit volume) for typical ambient temperatures and pressures encountered in duct leakage measurements. The error in measurement is relatively small for temperatures from 50 to 120 degrees F, and elevations up to 1200 feet.

If you are leak testing a system in high elevations such as Denver, or performing a leak test with unusually high or low air temperatures, a density correction should be made. Oriflow can supply data for your Oriflow orifice so that it is corrected for your particular environment. Oriflow has a duct test summary sheet that will automatically make those corrections for you as well as calculate duct surface area and other parameters.

Oriflow, LLC 2125 Range Rd., Suite B - Clearwater, Florida 33765

sales@oriflow.com
Tel: 727-400-4881

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MENU
  • Home
  • Products
    • Compare Models
    • Cobra Tester
    • Panther Tester
    • Rhino Tester
    • Accessories
      • Smoke Machines
      • Flexible Duct
      • Dust Covers
  • Contact Us
  • Technical
    • All Technical Topics
    • Introduction to Allowable Leakage Specification
    • Technical Calibrations
    • ANSI/ASHRAE 90.1-2010 – Leakage Specification
    • Duct Leak Testing Supply System
    • Duct Leakage Testing – RETURN SYSTEM
    • Orifice Plates
    • Manometers
  • Software
    • Online Programs
      • Allowable Leakage based on SMACNA Leakage Class
      • Allowable Leakage based on Percentage on System CFM
      • Allowable Leakage based on DW/143 Duct Pressure Class
    • Download Duct Test Sheets (calculate allowable leakage, duct surface area and more!)
      • Oriflow Duct Leakage Test Sheet: SMACNA Leakage Class
      • Oriflow Duct Leakage Test Sheet: Percent Allowable
  • Videos
  • Testimonials
  • Request a Quote