ZR-LNG can be economically deployed in the capacity range of 0.05 – 2.5 million tonnes/year per train covering both the bulk and “end of pipe” distributed production markets. Smaller plants suited to biogas liquefaction and jointly developed with Osomo Projects BV are also marketed as the ZR-iLNG process; a combination of Gasconsult and Osomo technologies.


ZR-LNG finds application in on-shore, near-shore and off-shore mid-scale bulk LNG production. The superior energy efficiency of ZR-LNG over conventional nitrogen processes has widened the envelope of economically viable applications for expander based processes. Single train capacities are feasible in excess of 2 million tonnes/year for land based plants and 1.5 million tonnes per year for FLNG schemes based on aero-derivative gas turbine drivers. Single train capacities of this magnitude facilitate phased increase of capacity to significant production levels to meet market growth or match clients cash constraints.

Its simplicity, low equipment count, low footprint and absence of external refrigerants makes ZR-LNG particularly applicable for remote operations or FLNG.

The low capital cost introduces a game changing ‘size fit’ making ZR-LNG suitable for deployment on gas fields with limited reserves and which cannot sustain the production or capital requirements of high capacity multiple refrigerant base-load plants.

End of Pipe Applications

The absence of a protected refrigerant storage and road/rail transfer infrastructure required for nitrogen and SMR schemes provides ZR-LNG an immediate capital saving on cost sensitive smaller schemes used for distributed production of LNG transportation fuel for the trucking, railroad and marine markets.

Operation of SMR and nitrogen schemes also require ongoing top-up of refrigerant lost through machine seals and plant upsets, providing ZR-LNG an operating cost saving over and above that arising from its low power demand.

For certain End of Pipe applications Gasconsult would offer, depending on plant capacity and gas composition, the ZR-iLNG process jointly developed with Osomo Projects BV of the Netherlands. The integrated ZR-iLNG system substantially reduces the equipment count, eliminates all make-up refrigerants and chemicals, eliminates all aqueous waste streams, eliminates all regenerative processes and required heat sources. It provides a fully continuous process which has been successfully piloted in the Netherlands.

This scheme was developed to overcome the negative economy of scale factors associated with the smaller capacity plants associated with biogas arisings. The system specifically eliminates the amine unit, dehydration system and refrigerant storage infrastructure used in conventional schemes, saving substantial capital cost. Further details on ZR-iLNG can be found in DOWNLOADS