Flare gas systems all over the world protect the environment, people, and equipment at industrial facilities.

Flare Gas Systems

Natural Gas Flaring on Offshore Platforms and in Oil ExtractionFlare gas systems burn flammable gas rather than releasing the gas into the atmosphere, which creates hazardous conditions. Historically, flaring gas was an easy solution, and there were no incentives given to minimize emissions. Today, however, there is an increasing need for energy, making capturing and reprocessing flare gas, rather than sending it to be burned more relevant than ever.

Whether the gas is burned or captured for reprocessing, measuring the gas is likely required. Finding the correct flow meter for flare gas use requires the system engineers to understand the fundamental challenges associated with this gas.

What are the challenges?

In a recent article, Wayne Shannon of Sage Metering reveals some of the challenges of measuring flare gas and some solutions. Among the complications discussed are:

    1. Flare gas lines at refineries contain a mixture of hydrocarbon gases. Thermal mass flow meters accurately measure the gas for which the instrument was calibrated, but if the composition changes, the meter will not be accurate.
    2. Not all flow meters can accurately measure the very low velocity of the sweep gas during normal conditions.
    3. Not all flow meters have high rangeability and can accurately measure gas in both the normal low-velocity flow of sweep gas and the high-velocity flow during upset conditions.
    4. The flare header’s pressure can be very low, and the flow meter must not have pressure drop and restrict the gas flow.
    5. High flow conditions of flare gas during upset conditions may damage flow sensors.

To learn about the solutions to these difficulties, read the article, The Challenges and Solutions of Flare Gas Metering.

You may also be interested in reading The Pros and Cons of Thermal Mass Flow Meters.

Thermal Mass Flow Meter Challenges When Measuring Flare Gas

Image by Elias Sch. from Pixabay

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