Differential Pressure Flow Measurement

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DP Flow Products

EMI offer an extensive range of differential pressure flow measurement products. Precision components are manufactured from a main central CNC Hub offering faster, precise and high quality finished products.

 

Differential pressure flow meters work by introducing a restriction to the pipe and measuring the difference in pressure via 2 pressure transmitters. The first stage requires a pressure drop across the flow meter by introducing some form of restriction. This restriction enables Bernoulli’s equation to be used for a flow rate calculation. The differential pressure drop is then measured by a dp transmitter and combine to work alongside other flow solutions within the system, such as flow conditioners and venturi tubes.

Differential Pressure Flow Solutions by EMI

Differential Pressure Orifice Plates

  • Orifice Plates
    • Square Edge
    • Conical Entrance
    • Quadrant
    • Eccentric
    • Segmental
    • Restrictions
  • Integral Orifice Carriers
  • Meter Run Sections
Differential Pressure Valves, Nozzles and Tubes by EMI

Other DP Flow Products

  • Venturi Tubes (ISO 5167-4)
  • Flow Nozzles (ISO 5167-3):
    • Long Radius
    • ISA 1932
    • Venturi Nozzles
  • Wedge Meters
  • Flow Conditioners / Straighteners (ISO 5167-2)
    • 19-Tube Bundle (1998)
    • Zanker Flow Conditioner Plate
Venturi Tube DP Flow Meter by EMI
Orifice Plate Meter Run Flanges by EMI
Venturi Tubes with Tri Clamp for DP Flow by EMI
Specifications
Differential Pressure Elements can be designed to suit all applications:
  • Measurement of gases, steam, liquids and slurries
  • Many options for materials of construction*
  • 3.1 or 3.2 Materials Traceability & NACE Compliance
  • ¼”NB 48″NB [DN8 to DN1200]
  • ASME, API, PN Rated Process connection to suit all requirements
  • Design Pressures & Temperature to customer requirement
  • Non-Destructive Testing
  • Calibration
  • PED Compliance
Materials
  • Carbon Steel grades
  • ChromeMoly Steels (F9, F11, F22, F91 etc.)
  • Austenitic Stainless Steel Grades (300 Series: 316, 304, 310 etc.)
  • Duplex/Super Duplex Grades (F51, F53, F55 & F60)
  • High Moly Stainless Steel (F44)
  • Hastelloys (C22 / C276 / B3)
  • Inconel® Grades (Alloy 600 / Alloy 625 / Alloy 718)
  • Incoloy® Grades (Alloy 800 / Alloy 825)
  • Monel® (Alloy 400)
  • Cupronickel
  • Titanium
  • Tantalum, Zirconium
Differential Pressure Bored Venturi Tube by EMI
Differential Pressure Orifice Plates by EMI
Differential Flow Venturi Tube by EMI
FAQs
What is Differential Pressure and How Does it Work?

Differential pressure flow meters work by introducing a restriction to the pipe and measuring the difference in pressure via 2 pressure transmitters. The first stage requires a pressure drop across the flow meter by introducing some form of restriction. This restriction enables Bernoulli’s equation to be used for a flow rate calculation. The differental pressure drop is then measured by a differential pressure transmitter and combine to work alongside other flow solutions within the system, such as flow conditioners and venturi tubes.

What are Differential Pressure Orifice Plates?

Orifice plates are used in the oil and gas industry to measure gas, liquid and fluids with a small amount of second phase. EMI’s orifice measurement solutions include the fitting, the plate and the plate carrier. The main plate sits adjacent to the pressure connections. This is a relatively simple piece of technology which can provide a high level of accuracy without the need for additional time-consuming calibration.

What are DP Flow Calculations?

The differential pressure flow is calculated as it is directly proportional to the square root of differential pressure, making pressure a critical component of DP Flow calculations. This calculation can be seen in more detail on the Instrumentation Tools website.

The mass flow rate may vary depending on the temperature, pipe diameter, density, viscosity, and fluid/gas type. Most EMI clients use a range of measurement and control devices to ensure they have the most accurate gas, liquid and steam flow rates to ensure consistency, safety, productivity and to minimise downtime.