Thermal mass flow meters provide direct mass flow measurement of vent gas in the oil and gas industry. Common sources include tank batteries or vented gases at the well site. Whether the vent gas comes from well completion, maintenance, or storage, an accurate flow measurement device is critical for emissions monitoring and safety.
Help Me Choose A Flow Meter
Our mass flow meter technology allows exceptional low-flow vent gas sensitivity, providing accurate measurement over a wide range of vented gases in gas operations.
Thermal mass flow rate measurement requires no additional temperature and pressure compensation equipment or calculations.
Fox Thermal’s meters are available with a variety of built-in alarms, totalizers, and communications protocols for easy interfacing with your emissions management system.
Thermal Mass Flow Meters from Fox Thermal can be used to continuously monitor the flow of gas in the pipes between the equipment found at these oil well sites:
Vent gas can often be tricky to measure. Some gas flow meter technologies can only monitor flow accurately at high velocities, and others at lower velocities.
Thermal mass gas meter vent technology is a proven solution that is able to measure gas flows at very high and very low flow rates.
All Fox Thermal mass flow meters are rugged and accurate meters that can be used in a wide variety of applications involving both low and high-velocity gas flows. With repeatability and a low turndown, our flow meters were designed to be durable and versatile.
Rising levels of volatile organic compounds (VOCs) in the atmosphere are a subject of increasing environmental regulation by bodies such as the US EPA, and other international, state, and local governments.
To monitor and quantify emissions, VOC concentrations as well as VOC flow rates must be measured to evaluate mass emission rate. Vent gas flow meters are commonly used for this purpose.
In addition to providing information for environmental audits, VOC monitoring can also help operators:
Thermal mass flow meters provide a direct reading of mass flow rate without additional pressure and temperature instrumentation, making it ideal for measuring flow rates in flare stacks, ducts, and tank vent pipes.
See how the Model FT3 is used frequently for this purpose in this Fox Thermal case study on VOC emissions.
Oil & Gas tank batteries that generate vent gas may store gas of different compositions from time to time. When the composition changes, the Gas-SelectX® settings in certain Fox Thermal flow meter models can be accessed on site to update the gas composition. This will ensure that the flow sensors will continue to monitor the varied vent gas compositions accurately.
If you’re not sure which meter is right for your application, our Help Me Choose app walks you through a short series of questions to help you choose the ideal meter.
Next, enter your process data and flow meter requirements into our automated product configurator. Drop-down menus and Help icons will guide you to answer each question.
Save the data you entered into the configurator to create a PDF with a model code and AppID. When you're ready, submit your application to Fox Thermal for a quote.
The Model FT1 thermal flow meter is available with Gas-SelectX® and can be easily reprogrammed in the field with the help of DDC-Sensor™ for calculating accurate gas correlations. It can measure a single gas or a mixture of up to 5 specified gases. The CAL-V™ Calibration Validation test feature ensures the meter retains its original NIST calibration.
The FT3 can operate over higher temperatures and measure a wide range of dry pure gases and gas mixes. Comes with CAL-V™ and Zero CAL-CHECK®. An optional Data Logger is available.
This versatile gas flow meter is available with CAL-V™ Calibration Validation, DDC-Sensor™, and Gas-SelectX® allowing it to be programmed to measure any combination of gases in the gas mix menu in 0.1% increments to create a custom gas mix.
The Model FT4X features CAL-V™ Calibration Validation, DDC-Sensor™, and Gas-SelectX®. For oil & gas applications affected by BLM 3175 and API 14.10, the FT4X is accuracy compliant. It also comes with a built-in data logger for advanced record-keeping and data retention that maintains a 7-year history.
This field study by the Texas Commission on Environmental Quality (TCEQ) evaluated VOC emissions factors from oil and natural gas condensate storage tanks using Fox Thermal meters.
This discussion of the different types of flow meters will help you understand the best gas flow measurement technology for your application.
Download helpful whitepapers, product literature, and more, including Fox Thermal Application Guides such as Direct Mass Measurement of Vent Gas (Flash Gas) Flow Rates.
