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Zero Flaring Engineering

Zero Gas Flaring

In the oil production, refining and manufacturing operations, the large amount of natural gas is flared daily around the world. Not only a valuable resource of energy is wasted, but also million tons of carbon dioxide is produced and released to the atmosphere. Thus, by considering the environmental concerns like vast emission of greenhouse gases and conserving energy oil and gas production companies/owners are encouraged or obliged to seek to minimize flaring, wherever practical. The following reports express the volume of wasting precious gases and environmentally hazardous products:

      – Flaring wastes energy equivalent to 3.5% of the world’s oil production each year

    – The flared gas emits 300 million tons of carbon dioxide into the atmosphere which is approximately equal to 1% of fossil fuel emissions

      – The wasted energy is more than the amount needed to generate electricity for the entire continent of Africa. It is equal to 20% of United States’ gas consumption and 30% of consumption in the European Union

      – NASA scientists report that emissions of nitrogen dioxide from flaring contribute heavily to the deposits of  soot on Arctic ice, which absorbs heat from the sun, melting the ice caps and raising sea levels

When the crude oil comes to the surface and it gets exposed to the surface pressure, it expands and some of its vapors are released. Since recompressing and reusing to create energy is not economically reasonable, these gases should be released or burned off. Releasing these gases which are mostly methane would be even worse than flaring, because methane greenhouse gas impact is greater than carbon dioxide.

Flaring Modes

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Continuous Flaring:

  • Purge gas
  • Leak gas from valves
  • Vast gas
  • Equipment blow-down

Non-continuous flaring:

  • Emergency depressurization
  • Compressor trip



Zero Gas Flaring System

Zero normal gas flaring arrangement consists of following three major systems:

  • Liquid seal mechanism
  • Flare ignition system
  • Flare gas recovery equipment

Liquid Seal Mechanism

1- Liquid seal after the flare KOD by ejector


2- Liquid seal after the flare KOD by low pressure gas compressors


Decision on using the ejector or low pressure compressor is made based on the availability of motive fluid, compressor capacities and its suction/discharge pressures. The liquid seals are necessary in downstream of KOD to restrict the gas in flare line and regularize the pressure between upstream of liquid seal and flare KOD. The liquid seal drum breaks in case of disturbance in the process plant and gets back to the normal operating condition automatically.

Flare Ignition System

An important issue to achieve the zero gas flaring is the flare ignition system. Using the pellet spark ignition system for zero gas flaring applications is the common practice in many companies. In the pellet spark ignition system, the ignition pellet is launched through a guide pipe and ignite when the pellet emerge from the guide pipe.

Flared Gas Recovery Equipment

Based on the available process facilities and utilities, the cost effective solution is tailored for specific production site/plant. Typical recovery packages are:

  • Cross over line
  • Ejector skid
  • Blower skid
  • Screw compressor skid
  • Liquid ring compressor skid

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Emtedad Engineering Company
EMTEDAD Engineering Company (EEC) founded in 1969 and has been working for more than 40 years with a powerful body of Management, Engineering, Procurement and Trading professionals in oil and gas and energy sector. The primary work field of EMTEDAD was limited to Design, Procurement and Construction of Power Distribution equipment, but in the recent years Oil and Gas industry and clean energy have been the main focus of EEC.
Contact Info
  • Unit 3, Floor 1, No. 1, Corner of Yas Dead End, 38th Street, Saadat Abad, Tehran, Iran
  • +98 21 88681973
  • info@emtedad.co.ir