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Vapour Recovery
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Vapour Recovery

Vapour Recovery Unit Ejectors


We supply Ejectors for use on Vapour Recovery Units (VRUs), also known as Vent Gas Recovery Units. Transvac Ejectorsuse Liquid or Gas driven Ejector Technology to compress vent gas for recovery. The vapour is either compressed back into the storage tanks that emitted the vapour or diverted into pipework for sale and distribution.


Transvac Ejectors are driven by high-pressure motive fluids (usually water or gas), which are used to entrain and compress low-pressure suction vapours to an intermediate discharge pressure.

Ejectors are a reliable choice for Tank Venting duties

What is Vapour Recovery?


Vapour Recovery is used in the oil & gas industry to prevent the release of harmful gases to atmosphere such as BTEX emissions. Vapour Recovery Units are normally found alongside crude oil or condensate storage tanks but can also be used for casing heads, storage tanks holding produced water or Glycol Dehydration Systems. When excess gas pressure builds in these storage applications, a Vapour Recovery Unit removes excess vapour, compressing it for discharge and fluid handling, thereby preventing release to atmosphere.


Ejector based Vapour Recovery Systems offer both economic and environmental benefits. By compressing and re-injecting usable gas into storage or distribution, oil & gas operators can turn otherwise wasted gas into a revenue stream. Recovering vapour also prevents the release of harmful, toxic gases to atmosphere preventing unnecessary damage to local wildlife and human populations and enables operators meet their Net-Zero Carbon commitments.

Why use Ejectors for Vapour Recovery?


For many of the reasons that Ejectors are an ideal solution for Flare Gas Recovery, they are also perfectly suited for use in Vapour Recovery applications. Transvac Ejectors commonly replace existing mechanical compressors as they offer more reliable service. Where mechanical compressors are prone to wear and failure, often leading to unplanned gas emissions, Ejectors do not have any moving parts and therefore do not require any maintenance. Many Transvac units have been in service for decades without any maintenance.


Our Vapour Recovery Units only require energy from a motive liquid or gas flow and in many instances, they can be driven by waste energy. If an existing source of energy is not available a complete skid mounted package can be supplied complete with associated pumps etc. similar to flare gas recovery systems.


The simple construction of Vapour Recovery Ejectors means they are not prone to gas leakage, unlike compressor seals which experience high levels of wear leading to regular leakage and failure. Transvac Vapour Recovery Ejectors are also highly tolerant to corrosive / sour gases, such as H2S, as they can be made from materials to suit the process requirements.

Transvac Liquid Driven Gas Compression



Our Vapour Recovery Unit Ejectors can be fitted to any system where an appropriate high-pressure motive flow is available for use. Specific unit applications may include:


  • Casing head gas recovery
  • Crude oil and condensate tank recovery
  • Produced water tank vapour recovery
  • BTEX emissions prevention



Transvac Vapour Recovery Unit Ejector applications include:


  • Reliable
  • Simple to retrofit
  • Long service life
  • Low OPEX costs
  • Negligible maintenance
  • Simple construction
  • Corrosion resistant
  • Fast-track solution