Environmental laws and restrictions mandate the precise monitoring of flare gas in the oil and gas industry. Hydrocarbon gases are often flared in a high-temperature oxidation process, which burns combustible components of waste. Natural gas, propane, ethylene, propylene, butadiene and butane constitute over 95 percent of the waste gases flared. A flow meter is required to monitor the waste gases. Consideration must be given to abruptness of flow change, low pressures, and a wide range of velocities. Thermal dispersion flow meters are ideal for flow measurement in flare stacks and headers due to low flow sensitivity and high turndown.
Benefits of Thermal Mass Flow Meters
The Magnetrol® Thermatel® TA2 thermal dispersion mass flow meter provides reliable [flare_gas] mass flow measurement for flare gas applications to comply with monitoring requirements. No additional pressure or temperature compensation is necessary to achieve a flow rate at standard or base conditions from a single transmitter. The TA2 can measure accurately at the lowest flows and pressures in any line size. It includes hot tap options for removal under process conditions. Calibrations for mixed gases are available and the insertion probe can be supplied with a retractable device for removing the probe for cleaning.
In addition, the TA2 has a high turndown with auto-switching capability—it can hold two calibration curves and provide two current outputs. The user can enable the auto-switching feature so the transmitter automatically switches between calibration tables. Maximum resolution is provided as the current outputs are scaled for the individual curves and extended turndown is achieved. The more power changes with flow, the greater the sensitivity of the flow meter, which is crucial for accurately monitoring flare gas.
To learn more about the TA2 and other MAGNETROL flow measurement products, you can visit our flow site.