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Process Flow Measurement
Measurement of liquid, gas and steam flows across process systems using appropriate Differential Pressure technologies.
Key Applications
Your Application. The Right Measurement.
Explore measurement options for your process and the factors that help determine the right solution.
Application navigation
Start with the duty
Jump to the application that best matches your process. Product suggestions are a starting point for discussion, not a final technical selection.
Application 01
Oil & Gas Flow & Temperature Applications
Measurement solutions for demanding process, utility, sampling and analyser duties across upstream, midstream and downstream operations.
Start with the duty
Application-led selection
Oil & Gas installations can combine primary process measurement with smaller auxiliary, purge, seal and analyser-system duties. McMenon supports flow and temperature measurement requirements across that range, with the product choice matched to the process data and installation.
Application areas
Six duties. One clear route to selection.
Start with what the installation needs to measure, then follow the relevant technology and product links.
02
Purge & Seal Flows
Low-flow measurement for purge gas, seal gas and other controlled auxiliary flows, highlighting Variable Area flowmeters where technically appropriate.
03
Sampling & Analyser Systems
Compact flow measurement for sample conditioning, analyser panels and instrumentation systems. Variable Area flowmeters should be clearly represented here for suitable smaller duties.
04
Cooling Water & Utilities
Flow measurement for cooling water, service water, utility gases and supporting plant systems.
05
Gas & Liquid Monitoring
Variable Area and Differential Pressure solutions for local indication and process monitoring where appropriate.
06
Temperature Monitoring
Temperature measurement for process equipment, pipelines and supporting systems using relevant McMenon temperature products.
Product technologies
Solutions for Oil & Gas Applications
Use the application duty to narrow the technology first, then open the existing product pages for technical detail.
Differential Pressure Flow Measurement
Differential Pressure Flow Measurement
DP technologies for liquid, gas and steam process duties, selected around the fluid, flow range, pressure loss and installation conditions.
DP measurement
QBar™ Averaging Pitot Tube
Suitable for liquid, gas and steam flow measurement, with published applications including oil production and refining and gas processing and transmission.
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DP measurement
Venturi Flow Meter — FPD300
A long-service-life DP meter for liquid, gas and steam measurement, with published oil and gas and LNG applications.
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Variable Area Flow Measurement
Variable Area Flow Measurement
VA flowmeters are a clear starting point for suitable purge, seal, sampling, analyser, utility-gas, cooling-water and local-indication duties.
VA measurement
A6 Glass Tube Variable Area Flowmeter
Low-capacity liquid and gas measurement for instrument purging, fluid sampling and similar services.
View productVA measurement
FAM3200 Metal Tube Variable Area Purgemeter
Armoured small-flow measurement for gases and liquids where cloudy, opaque or aggressive media may make a glass tube unsuitable.
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VA measurement
FAM540 Metal Cone Variable Area Flowmeter
A configurable metal-tube VA flowmeter for process liquid and gas duties within the selected meter’s operating limits.
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VA measurement
FGM1190 Glass Tube Variable Area Flowmeter
Direct visual indication for clear liquids and gases, including suitable cooling-water and utility duties.
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Temperature Measurement
Temperature Measurement
Temperature products for process equipment, pipelines and vessels, with the sensor, thermowell and installation matched to the duty.
Temperature measurement
TAI Temperature Sensor Assemblies
Modular assemblies with connection head, sensor and transmitter options, engineered with the Oil & Gas industry in mind.
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Temperature measurement
Multipoint Temperature Sensors
Multiple temperature measurements through a single process vessel entry for engineered-to-requirement applications.
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Temperature measurement
Surface Mount Temperature Sensors
A surface-mounted approach where penetrating the pipeline is not desirable, with the final arrangement matched to the application.
View productApplication selection considerations
Selecting for Your Application
Bring these details together before choosing the measurement technology or requesting a quotation.
- 01
Process fluid or gas
- 02
Flow rate and required measurement range
- 03
Operating pressure
- 04
Operating temperature
- 05
Line size and connection
- 06
Wetted material compatibility
- 07
Required accuracy
- 08
Local indication or transmitted output
- 09
Hazardous-area requirements
- 10
Installation conditions
Related content
Technical resources for the next step
Review the approved case study, selection guides and product datasheets, then share the relevant process details with the McMenon team.
Related process case study
SRU tail-gas incinerator at extreme temperature
A specialised high-temperature probe addressed a demanding stack flow measurement duty downstream of a Sulphur Recovery Unit incinerator.
Read the case studySelection guideVariable Area Flowmeter Selection GuideOpen resourceSelection guideQBar Selection & Practice GuideOpen resourceProduct datasheetQBar™ Averaging Pitot Tube DatasheetOpen resourceProduct datasheetA6 Variable Area Flowmeter DatasheetOpen resourceProduct datasheetFAM3200 Variable Area Purgemeter DatasheetOpen resourceProduct datasheetFGM1190 Variable Area Flowmeter DatasheetOpen resource
Application 02
Cooling Water
Cooling circuits need a clear check that the branch or auxiliary loop is receiving the intended flow, from equipment cooling to secondary loops in data-centre systems.
What to consider
- Fluid and operating temperature range
- Required local indication, alarm or signal
- Connection type and available installation position
Explore suitable products
VA measurement
FGM1190 Glass Tube Variable Area Flowmeter
Clear visual indication for suitable clear-water cooling circuits and equipment.
Explore productVA measurementFAM540 Metal Cone Variable Area Flowmeter
A configurable metal-tube VA meter for cooling and utility lines within its operating limits.
Explore productDP measurementVenturi Flow Meter — FPD300
A long-service-life DP meter for water treatment, distribution and suitable utility duties.
Explore productApplication 03
Purge & Seal Flows
Instrument purging and seal-water duties often depend on small, visible flow indication so operators can check that protection and support flows are present.
What to consider
- Small flow range and required scale length
- Liquid or gas properties and pressure variation
- Valve, regulator, alarm and panel-mounting requirements
Explore suitable products
VA measurement
A6 Glass Tube Variable Area Flowmeter
Low-capacity visual flow indication for instrument purging, sampling and small liquid or gas flows.
Explore productVA measurementFAM3200 Metal Tube Variable Area Purgemeter
Armoured small-flow measurement for gases and liquids where a glass tube may be unsuitable.
Explore productVA measurementFGM1190 Glass Tube Variable Area Flowmeter
Direct-reading indication for suitable clear liquid and gas lines within equipment and plant utilities.
Explore productApplication 04
Sampling & Analyser Systems
Sampling and analyser systems use controlled, visible flow to help operators understand what is reaching the sample point or analyser.
What to consider
- Sample fluid or gas and material compatibility
- Low flow range, pressure and temperature
- Panel, wall or in-line installation requirements
Explore suitable products
VA measurement
A6 Glass Tube Variable Area Flowmeter
Suitable for fluid sampling, small liquid and gas flows, and integrated instrument systems.
Explore productVA measurementFAM3200 Metal Tube Variable Area Purgemeter
A metal-tube option for small flows in gas analysis plants and process engineering.
Explore productVA measurementFGM1190 Glass Tube Variable Area Flowmeter
Easy-to-read flow indication for suitable clear liquids and gases in equipment and test rigs.
Explore productApplication 05
Dosing & Low Flows
Low and small flows need a meter selected around the process fluid, range and installation rather than a one-size-fits-all product choice.
What to consider
- Flow range, scale and required rangeability
- Fluid clarity, chemistry and wetted materials
- Needle valve, regulator, alarm or transmitter options
Explore suitable products
VA measurement
A6 Glass Tube Variable Area Flowmeter
Low-capacity measurement for small liquid and gas duties, with valve and regulator options.
Explore productVA measurementFAM3200 Metal Tube Variable Area Purgemeter
Armoured measurement for small flows of opaque, cloudy or aggressive liquids and gases.
Explore productVA measurementFGM1190 Glass Tube Variable Area Flowmeter
Direct visual indication for suitable clear-water and process equipment duties.
Explore productApplication 06
Process Liquid & Gas Flow
For main process lines, the right approach depends on the fluid, pipework, flow range and pressure-loss requirements. McMenon’s DP and metal-tube VA families cover different duties.
What to consider
- Fluid phase, density, viscosity and solids content
- Flow, pressure, temperature and allowable pressure loss
- Pipe size, straight lengths and connection arrangement
Explore suitable products
DP measurement
Read the SRU tail-gas case studyWedge Flow Meter — FPD470
A robust DP primary element for difficult applications, slurries and high-viscosity liquids.
Explore productDP measurementVenturi Flow Meter — FPD300
A low-pressure-loss DP primary element for liquid, gas and steam flow measurement.
Explore productVA measurementFAM540 Metal Cone Variable Area Flowmeter
Configurable metal-tube VA measurement for process liquid and gas duties.
Explore productApplication 07
Steam & Utilities
Steam, utility gases and plant water flows need a measurement approach that accounts for pressure, temperature, flow range and the energy cost of pressure loss.
What to consider
- Fluid state and operating pressure and temperature
- Required flow range and signal or local indication
- Pressure loss, straight lengths and access for installation
Explore suitable products
DP measurement
QBar™ Averaging Pitot Tube
A low-pressure-loss averaging pitot solution for air, gas, steam and liquid applications.
Explore productDP measurementVenturi Flow Meter — FPD300
A Venturi tube for steam, water and gas flow measurement with low net pressure loss.
Explore productVA measurementFAM540 Metal Cone Variable Area Flowmeter
A metal-cone VA flowmeter for liquid, gas and steam duties.
Explore productApplication 08
Temperature Monitoring
Temperature measurement may call for a sensor assembly, a surface-mounted sensor, multiple points from one vessel entry or a thermowell matched to the installation.
What to consider
- Process temperature, response time and sensor type
- Insertion, surface or multipoint installation
- Materials, connection head and transmitter requirements
Explore suitable products
Temperature measurement
TAI Temperature Sensor Assemblies
Modular assemblies combining a connection head, sensor and transmitter options.
Explore productTemperature measurementSurface Mount Temperature Sensors
A surface-mounted approach where penetrating the pipeline is not desirable.
Explore productTemperature measurementMultipoint Temperature Sensors
Multiple temperature measurements through a single process vessel entry.
Explore productTemperature measurementTTW Series Thermowells
Thermowells that can be supplied with TAI assemblies for a complete sensor system.
Explore productFind the Right Solution for Your Application
Talk to our team about your process conditions, flow range and installation requirements and we’ll help identify the most suitable measurement solution.