Orifice Plate Flow Meter Systems
Orifice Plate Flow Meter Systems
Flowell manufactures components for orifice plate flow meter systems used in standards-based differential pressure (DP) flow measurement across gas, liquid, and steam service. An orifice plate system creates a controlled pressure drop across a precision-machined plate, then a DP transmitter converts that differential into a flow rate for operations, custody-related reporting, and process control.
This page is your commercial hub to understand how orifice plate systems are built, compare common configuration paths, and select the Flowell components that support repeatable, reliable measurement. If you already know your service conditions, start with sizing support or request a quote.
How an Orifice Plate Flow Meter System Works
An orifice plate is installed in the flow path to create a repeatable restriction. The pressure upstream and downstream of the plate is measured through taps, impulse lines, and a DP transmitter. As flow increases, the differential pressure increases in a predictable way. System performance is driven by correct plate selection, stable installation geometry, and dependable flow profile conditions.
Core Components in an Orifice Plate System
- Primary element: universal orifice plates or paddle-type orifice plates.
- Plate holder or assembly: orifice flange union or RTJ plate holders.
- Meter run support: meter tubes and straightening vanes when straight-run constraints or flow disturbances exist.
- Protection and system safety: strainers, condensate chambers (steam), and bleed rings.
Orifice Plate Options
Orifice plate systems are popular because they are standards-based, widely understood, and practical to maintain. The plate style you choose depends on how the system is installed, how often plates are changed, and what handling method fits your plant workflow.
System Stability and Repeatability
In the real world, measurement repeatability depends heavily on upstream and downstream conditions. Flow disturbances from elbows, valves, reducers, and pumps can affect profile and stability. When straight-run constraints exist, a properly designed meter run and flow conditioning approach can help stabilize performance.
- Need a stable meter run? Start with meter tubes.
- Dealing with swirl or turbulence? Use straightening vanes where design conditions call for it.
- Protect the primary element and instrumentation: add strainers and consider condensate chambers in steam service.
Flowell Products Used in Orifice Plate Systems
Flowell supports complete orifice plate system builds by manufacturing the components that drive repeatability and long-term reliability. Use the links below to view configurations, specifications, and options.
When to Consider Alternatives
Orifice plate systems are a strong fit in many applications. If your process is highly sensitive to pressure loss or you need an element known for reduced permanent pressure drop, you may want to compare against a venturi system. If your service is higher velocity or especially severe, a flow nozzle may be a better fit.
Standards Reference
Orifice plate DP systems are often designed and installed using recognized industry standards and accepted practices for differential pressure devices. For a widely recognized reference on orifice plates and DP devices, see ISO 5167.
Sizing and Quote Checklist
Send these basics and we can recommend the right orifice plate system configuration.
- Line size (NPS and schedule or ID)
- Media (gas, liquid, steam) and composition if relevant
- Operating pressure and temperature
- Flow range (minimum, normal, maximum)
- Allowable pressure drop and measurement expectations
- Straight-run availability and upstream disturbances
- Material requirements and pressure class