Gas Solutions

Wärtsilä Gas Solutions offers innovative and energy efficient systems and solutions related to a number of oil & gas segments. The scope includes marine LNG and LPG cargo systems, fuel gas systems for marine vessels, onshore gas terminals, biogas systems, flare gas ignition, oil separation and tank control systems. The business unit has end-to-end responsibility from sales to commissioning of complete systems.

LNG Reliquefaction Systems

Wärtsilä is a leading designer, developer and supplier of energy efficient LNG Boil-Off Gas (BOG) reliquefaction plants. These systems are designed to be efficient, reliable, safe, robust and flexible.

With more than 50 systems in operation, Wärtsilä has the highest number of BOG reliquefaction plants installed in the global LNG carrier fleet.
We work closely with our customers to develop technological solutions that meet their needs for increased fuel flexibility, energy efficiency, and environmental performance in today’s fast changing LNG market.
BOG Reliquefaction site

LNG Regasification Systems

Our portfolio of LNG regasification technologies represents an industry benchmark in terms of energy efficiency, robustness, and operational flexibility.

Wärtsilä has delivered and commissioned numerous floating LNG regasification plants based on either closed loop regasification technology, using steam with water/glycol as the intermediate heating medium, or open loop regasification technology using sea water with propane as the intermediate heating medium. An open seawater solution using glycol as intermediate medium is also under development.

We have also delivered modularised regasification plants for jetty installations. These facilitate a much shorter construction time compared to conventional land based LNG regasification terminal projects.

Wärtsilä LNG Regasification Systems Site

VOC Recovery

Our field proven system is self supplied with energy and results in zero volatile organic compounds (VOC) emissions.

These emissions from the global sea transportation of crude oil and associated products, account for a total of more than 5 million tonnes per year. The Wärtsilä VOC plant ensures that cargo tank pressures are maintained low enough to keep the vent valve closed. This prevents VOC from being emitted to the atmosphere, and the gas is instead fed to the VOC recovery module, where it is treated by compression and condensation. The liquefied gas is then fed to the VOC fuel tank.

We have also developed a system for VOC recovery in offshore oil loading applications. It exceeds the Norwegian authorities’ requirements for Non-Methane Volatile Organic Compounds (NMVOCs) by reducing VOC emissions by 100 per cent, including methane, which is not currently specified in the regulatory requirements.

Wärtsilä Voyage Emissions Reduction system Site

Cargo Handling for small LNG Carriers

There is a growing demand for small-scale transportation of LNG to end users that are located in areas where pipelines are not feasible or economically viable. Typically, such end users are power generation plants, land based industries, and suppliers of LNG as fuel for vehicles or ships. Wärtsilä has developed a Cargo Handling System, the design of which is based on the extensive experience that Wärtsilä Gas Solutions has accumulated in delivering such systems for LPG, LEG and LNG carriers. The available scope includes:

  • Cargo handling system
  • Boil-off gas handling
  • Cargo tank design and complete tank delivery
  • Ship design
  • LNG fuel supply system

We provide designs for small size LNG Carriers carrying LNG only, or Multi Gas Carriers able to carry all types of gas cargo. Typically these ships are between 4 000 and 40 000 m3.

Cargo Handling for Small Scale LNG

Useful Downloads

LNG Systems Brochure


Voyage Emission Reduction System Brochure 


Cargo Handling Systems Brochure