Why do lng plants flare

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Last updated: April 8, 2026

Quick Answer: LNG plants flare primarily for safety during emergencies, maintenance, and process upsets to prevent dangerous pressure buildup. For example, during the 2022 Freeport LNG explosion in Texas, flaring released over 100,000 metric tons of CO2 equivalent. Routine flaring at LNG facilities can account for 1-3% of total gas throughput, with global LNG flaring estimated at 5-10 billion cubic meters annually. The practice is regulated under EPA rules like 40 CFR Part 60, requiring combustion efficiency of at least 98%.

Key Facts

LNG plants flare mainly for safety to relieve pressure during emergencies, startups, shutdowns, or maintenance
Global LNG flaring releases approximately 5-10 billion cubic meters of gas yearly, contributing to greenhouse gas emissions
Flaring at LNG facilities typically accounts for 1-3% of total natural gas throughput during normal operations
The 2022 Freeport LNG explosion in Texas resulted in flaring of over 100,000 metric tons of CO2 equivalent
EPA regulations (40 CFR Part 60) require flaring systems to achieve at least 98% combustion efficiency

Overview

Liquefied Natural Gas (LNG) plants flare excess gas as a critical safety measure to manage pressure and prevent explosions during operational disruptions. The practice dates to the mid-20th century with the growth of LNG trade, notably after the first commercial LNG plant opened in Arzew, Algeria in 1964. Flaring became standardized following incidents like the 1973 Staten Island LNG explosion, which highlighted the need for controlled gas disposal. Modern LNG facilities, such as Qatar's Ras Laffan complex (capacity 77 million tons/year) and Australia's Gorgon project, incorporate sophisticated flaring systems. The global LNG industry flared approximately 5-10 billion cubic meters of gas in 2022, representing both safety necessity and environmental concern, with regulations evolving since the 1990 Clean Air Act amendments.

How It Works

LNG plants flare through dedicated systems that safely combust excess gas. During normal operations, flaring occurs during startup, shutdown, or maintenance when process units like liquefaction trains (using technologies like AP-C3MR or Cascade) must depressurize. In emergencies like equipment failure or power loss, pressure relief valves automatically route gas to flare stacks, where it mixes with steam or air and ignites at 800-1,200°C. The combustion converts hydrocarbons primarily to CO2 and water vapor, reducing methane emissions by 98% compared to venting. Systems include knockout drums to remove liquids, pilot flames for ignition, and smokeless designs using steam injection. For instance, Cheniere's Sabine Pass facility uses elevated flares handling up to 3,000 tons/hour during major upsets, with continuous monitoring for compliance.

Why It Matters

Flaring at LNG plants matters significantly for safety, environmental, and economic reasons. Safety-wise, it prevents catastrophic explosions like the 2004 Skikda LNG plant accident in Algeria that killed 27 workers. Environmentally, while preferable to venting methane (25 times more potent than CO2), flaring still emits greenhouse gases—global LNG flaring contributes roughly 15-30 million tons of CO2 annually. Economically, flared gas represents lost revenue; at $5/MMBtu, 10 billion cubic meters wasted equals about $1.8 billion. Regulations like the World Bank's Zero Routine Flaring by 2030 initiative push for alternatives, such as gas recovery systems used at Australia's Prelude FLNG, which reduced flaring by 50%. Public scrutiny also drives innovation, as seen with electrified flares reducing noise and light pollution near communities.