Yokogawa Differential Pressure Flow Meters Calibration & Repair UAE
Types of Differential Pressure Flow Meters
• Orifice plate: Simple to use, no moving parts, sturdy, and available in various models.
• Venture tube: Used for turbulent flow conditions.
• Elbow: Used for pressure measurements in pipes less than 50mm diameter.
• Pitot tube: Measures the permanent loss of pressure across an orifice.
Advantages and Disadvantages of Differential Pressure Flow Meters
• Simple to use, no moving parts, sturdy, and available in a wide range of models.
• Low accuracy due to wear of primary element and high permanent pressure loss.
Orifice Plates
• Widely used primary elements consisting of a flat metal with a hole bored in.
• Increased fluid velocity causes pressure drop and increased turbulence.
• Pressure recovery can be up to 50% of the total pressure drop across the orifice plate.
Components of an Orifice Plate Installation
• Orifice plate and holder.
• Orifice taps.
• Differential pressure transmitter.
• Flow indicator/recorder.
Orifice Plates and Holders
• Installed between special flanges in a horizontal pipe run.
• Flange taps for precise control of distance from the orifice plate.
• Vena Contracta taps for maximum differential pressure across the orifice.
• Corner taps for pressure measurements in pipes less than 50mm diameter.