Separators in the Oil & Gas Industry: Maximising Performance with Accurate Measurement and Control
26 August 2026
Separators are fundamental to upstream oil and gas production, playing a critical role in separating crude oil, natural gas and produced water before each stream moves on for further processing, transportation or storage. From offshore platforms and FPSOs to onshore production facilities and refineries, efficient separator performance is essential for maintaining production efficiency, ensuring accurate measurement and meeting environmental and fiscal requirements.
While the separator vessel performs the physical separation of fluids, the instrumentation surrounding it determines how effectively the process is monitored and controlled. Accurate flow, pressure and temperature measurement provide operators with the data they need to optimise production, improve operational efficiency and maintain confidence in production reporting.
As a UK Master Representative for Daniel Measurement & Control, Process Instrument Solutions supplies industry-leading flow measurement technologies alongside a comprehensive range of Siemens process instrumentation, delivering complete measurement solutions for separator applications throughout the oil and gas industry.
What is an Oil & Gas Separator?
An oil and gas separator is a pressure vessel designed to separate the wellstream into its individual phases, typically:
- Crude oil
- Natural gas
- Produced water
- Sand or other solids where present
As production fluids enter the separator, changes in pressure and velocity, combined with gravity and internal vessel components, allow each phase to separate according to its density.
Depending on the application, facilities may utilise:
- Two-phase separators (oil and gas)
- Three-phase separators (oil, gas and water)
- Test separators for well performance monitoring
- High, medium and low-pressure separator trains
The effectiveness of this separation directly impacts downstream processing, product quality, equipment reliability and production efficiency.
Why Instrumentation is Critical
Modern separator systems rely on accurate instrumentation to provide continuous monitoring of key process variables.
Typical measurements include:
- Separator inlet flow
- Oil export flow
- Gas export flow
- Produced water flow
- Vessel pressure
- Process temperature
- Interface and vessel levels
Without reliable instrumentation, operators may experience:
- Reduced separation efficiency
- Production losses
- Inaccurate production allocation
- Custody transfer discrepancies
- Increased maintenance costs
- Process instability
High-quality measurement enables operators to optimise separator performance, reduce operational risk and make informed process decisions based on reliable data.
Daniel Measurement Technologies for Separator Applications
Daniel Measurement & Control has been trusted throughout the global oil and gas industry for decades, particularly where high-accuracy flow measurement and fiscal metering are required. As a UK Master Representative, Process Instrument Solutions provides access to the complete Daniel portfolio together with expert application support.
Daniel Liquid Turbine Meters
Daniel Liquid Turbine Meters remain one of the industry’s leading solutions for high-accuracy liquid hydrocarbon measurement.
Common separator applications include:
- Crude oil export
- Pipeline transfer
- Tank loading
- Refined petroleum products
- Custody transfer systems
Key benefits include:
- Exceptional measurement accuracy
- Outstanding repeatability
- Low pressure loss
- Proven long-term reliability
- International fiscal approvals
These meters continue to be a preferred technology wherever measurement confidence directly impacts revenue.
Daniel Cone Meters
Gas flow leaving separators often presents installation challenges due to limited straight pipe runs and varying flow profiles.
Daniel Cone Meters provide highly accurate differential pressure flow measurement while requiring significantly shorter upstream pipe lengths than traditional primary elements.
Typical applications include:
- Natural gas measurement
- Wet gas systems
- Offshore production facilities
- FPSOs
- Refinery processes
Their robust design also minimises permanent pressure loss whilst maintaining excellent accuracy.
Daniel Wedge Meters
Produced water and heavy crude applications can present difficult flow conditions due to viscosity and suspended solids.
Daniel Wedge Meters are specifically designed for these demanding duties and offer:
- Reliable measurement of viscous liquids
- Excellent performance with dirty process fluids
- No moving parts
- Low maintenance requirements
- Long operational life
Their rugged construction makes them ideal for harsh upstream environments where reliability is essential.
Daniel Senior Orifice Fittings
Orifice plate technology remains one of the most widely specified methods for natural gas measurement within the oil and gas industry.
Daniel Senior Dual Chamber Orifice Fittings allow operators to inspect or replace orifice plates without depressurising the pipeline, helping reduce downtime while maintaining safe operation.
These systems are widely used for:
- Gas production
- Allocation metering
- Custody transfer
- Pipeline measurement
- Process gas monitoring
Combined with differential pressure transmitters and flow computers, they provide highly accurate and internationally recognised flow measurement solutions.
Siemens SITRANS FC Coriolis Flowmeters
For separator applications requiring direct mass flow measurement, Process Instrument Solutions also supplies the Siemens SITRANS FC Coriolis range.
These advanced flowmeters simultaneously measure:
- Mass flow
- Density
- Process temperature
Providing multiple process variables from a single instrument allows operators to improve production reporting, optimise separator performance and support downstream processing calculations.
The Siemens SITRANS FC range offers:
- High measurement accuracy
- Excellent repeatability
- Direct mass flow measurement
- Density and temperature measurement from one device
- Compact and remote-mounted configurations
- Suitable for crude oil, condensate and refined hydrocarbon products
These flowmeters are particularly valuable on separator outlet lines where accurate production allocation and process optimisation are required.
Pressure and Temperature Measurement
Flow measurement is only one part of an effective separator control strategy.
Accurate pressure and temperature monitoring enables operators to:
- Maintain optimum separator operating conditions
- Improve production efficiency
- Support compensated flow calculations
- Detect process upsets quickly
- Protect downstream equipment
- Enhance overall process control
Process Instrument Solutions supplies a wide range of Siemens pressure instrumentation and temperature measurement solutions to complement Daniel flow technologies, providing complete instrumentation packages tailored to individual applications.
Complete Measurement Solutions from Process Instrument Solutions
Selecting the correct instrumentation is just as important as selecting the separator itself. Every installation has unique operating pressures, temperatures, fluid properties and measurement objectives.
Our experienced engineering team works closely with customers to specify the most appropriate technologies for each application, offering support from initial design through to commissioning and ongoing maintenance.
As a UK Master Representative for Daniel Measurement & Control and an authorised supplier of Siemens process instrumentation, Process Instrument Solutions delivers complete measurement solutions for upstream, midstream and downstream oil and gas facilities.
Whether you’re upgrading an existing separator system, improving production measurement or designing a new installation, we can help you select the right instrumentation to maximise performance, improve measurement confidence and support long-term operational reliability.
Speak to Our Oil & Gas Measurement Specialists
Separator performance depends on accurate, reliable measurement. By combining Daniel’s industry-leading flow technologies with Siemens instrumentation and expert engineering support, Process Instrument Solutions helps operators optimise production, improve operational efficiency and achieve dependable measurement across every stage of the separation process.
If you’re planning a new separator installation or looking to improve the performance of an existing system, contact our team to discuss the right instrumentation solution for your application.