Enclosed Ground Flares for Gas Gathering Stations
Enclosed ground flares that burn routine and relief gas at oil and gas gathering stations, at grade and with no visible flame.
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Relief gas burned at grade, out of sight
CRA's enclosed ground flares give gas gathering stations a safe route for routine, upset and emergency relief gas. The gas burns inside the enclosure, so the station has no visible flame and far less radiant heat at its fence.
Destruction efficiency
>98%
Visible flame
Zero
Standard
API 537
Design
CFD-validated
What does an enclosed ground flare do at a gas gathering station?
A gas gathering station receives gas from many wells and sends it on for processing. When a compressor trips, a line is depressurised or the downstream plant cannot take the gas, the station has to burn it safely. An enclosed ground flare does this at grade, inside a closed combustion chamber, so the flame stays out of sight.
How it works
The flare connects to the station's relief header through a knockout drum, which removes liquids before the gas reaches the burners.
Relief gas from the station flows through the header and the knockout drum to the flare.
Burner stages open in turn as the relief flow rises, so combustion stays clean at every load.
The gas burns inside the enclosure, which hides the flame and contains the radiant heat.
Pilots and flame detection keep the flare ready, and the burner management system watches every stage.
When the relief ends, the burner stages close and the flare returns to standby.
Key Benefits
Combustion stays inside the enclosure, which keeps flame, glare and smoke out of sight of the people living around the station.
The enclosure keeps radiant heat away from operators, equipment and the station fence.
CRA designs the burners for the station's routine, upset and emergency flows.
The flare is designed to destroy more than 98% of the hydrocarbons in the relief gas.
Pilots, ignition and the burner management system let the flare run with little operator attention.
Projects That Push Boundaries
LSTK delivery of three enclosed ground flares replacing atmospheric venting with enclosed combustion.
Single enclosed flare for HP and LP associated gas, designed to meet the site's radiation, noise and emission limits.
Low-flame, low-noise operation inside active plant boundaries, designed to API 521/537.
The CRA Edge
CRA has more than 30 years of experience in gas handling and flare engineering.
Design, R&D and manufacturing are carried out under one roof.
ISO 9001 certified through TÜV NORD, with designs aligned with ASME, API and CE.
Designs are customised to the process needs and the regulations that apply at site.
Applications
Built to help you specify.
Sizing tools, decision guides, and technical references. Use them before, during, and after your evaluation.
Frequently Asked Questions
Why do gas gathering stations use enclosed ground flares?
An enclosed ground flare burns relief gas at grade with the flame hidden inside the enclosure, which cuts glare, noise and radiant heat on stations close to communities and farmland.
Can one flare handle both routine and emergency flows?
Yes. CRA stages the burners so that the flare burns cleanly at low routine flows and still takes the full emergency relief load.
What does CRA need to size the flare?
CRA needs the relief cases with their flow rates, the gas composition range, the available pressure, the plot space and the site conditions.
Is the flare designed to a standard?
Yes. CRA designs and builds its enclosed ground flares to API 537 and to the emission norms that apply at site.
Does CRA supply the ignition and burner management system?
Yes. CRA supplies the pilots, the ignition system and the burner management system with the flare.