VSL offers a cost-effective and safe solution for the design, construction and maintenance of storage tanks, like LNG tanks, digesters and silos. Our expertise focuses on the outer containment structure; a prestressed concrete wall capable of withstanding high hydraulic pressure to provide a safeguard in case of failure of the inner tank. Our solutions can be combined to create bespoke packages or applied as standalone services for storage tank construction.

Ground improvement

The improvement of ground properties guarantees solid foundations and therefore, improved stability, durability, and increased success of storage tank and silos construction. Ground improvement also reduces the cost of foundation works. Ground improvement methods include:

  • vibro-compaction
  • stone columns
  • installation of solid concrete inclusions
  • ground bearing capacity improvements using cement grouting
  • soil mixing
  • barrettes or walls
  • jet grouted columns

Cut-off walls for storage tank and silos construction

Cut-off walls act as containment structures: they can be installed as part of a storage tank like a Liquid Natural Gas (LNG) storage project to isolate an area and prevent any migration of material, generally in liquid form, into or out of the surrounding ground.

Horizontal directional drilling

The Horizontal Directional Drilling (HDD) construction method is an innovative and effective trenchless technique for installing different types of services. This approach is becoming increasingly popular as it greatly reduces the amount of disruption at the surface, which is a vital factor for the construction of Liquid Natural Gas (LNG) storage facilities and silos.

VSoL® Retaining wall system

VSL Technologies

VSoL® is a retaining wall system combining concrete facings, soil reinforcement and granular backfill. Use of the VSoL® system makes it possible to work simultaneously at different levels on a constrained site, including in close proximity to storage tank and silos construction.

Post-tensioning for storage tank construction

VSL Technologies

Post-tensioning is an active structural reinforcement method that ensures the leak-tightness of the outer containment structure enclosing the high-nickel steel tank used to store LNG. The addition of post-tensioning to the outer structure, generally made of reinforced concrete, guarantees that it is capable of withstanding the hydraulic pressure coming from the liquefied gas in case of failure of the inner containment. Post-tensioning also allows for an optimised design by offering design flexibility and an overall improvement of durability. It can also offers significant savings through a reduction of required construction materials and shorter construction time for storage tanks and silos.

Tank construction

The construction in concrete of the outer containment structure enclosing the high-nickel steel tank used to store LNG. The outer structure is designed to withstand abnormal loads of external origin as well as retaining the liquid and vapours in case of failure of the inner containment. It is critical with regards to quality and construction schedule.


The safety requirements and extreme operating conditions of cryogenic storage, such as LNG tanks, digesters or silos, require comprehensive and reliable leak detection and monitoring solutions.

Repairs and strengthening

Storage tanks and silos have to resist the internal filling pressure while always remaining leak-tight. Safe usage of the structure can be jeopardised throughout its service life by corrosion, concrete degradation under aggressive conditions, defects and low-cycle material fatigue.

As a consequence, it might become necessary to repair and strengthen these circular structures at some stage.

As soon as your containment structure for storage tank and silos is built, it enters a long-term life cycle with evolving needs and regular preservation, repairs and upgrading requirements.
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