About us


OSS was established in 2007 in Plungė, Lithuania. Since its early days, OSS has been setting high goals and implementing ambitious projects. Having started its activities in Lithuania, the company has expanded throughout 10 countries over the last 13 years. Currently, OSS has established representative offices in Sweden, Finland and Norway.

Areas of Competence

OSS specialises in the installation, repair and maintenance of technological pipelines, storage tanks and industrial containers. We also carry out metal construction and ventilation installation and welding work.

Areas of Activity

Our highly qualified staff provides top-quality services in the oil refining, gas, chemical, energy, pulp & milling, shipping and other industries.

Why choose OSS?

During its more than 13 years of development, OSS has accumulated a lot of knowledge and experience. The company seeks open and fair partnership. Our main asset is our highly-qualified personnel, which can work as a team or as individual specialists, and are professionals in their fields. The main priority of OSS is the timely provision of high-quality services according to international standards.

Currently, 90% of services are provided in foreign countries. We are well aware of work safety and quality, and therefore, we are able to meet the requirements of each country. We have the necessary personnel, equipment, permits and licenses to carry out the types of work mentioned above.

Our Partners and Implemented Projects

Please look through our accomplished work. We are pleased to announce that we were working on many construction sites, refineries and factories, which shows that you can trust our company. Our largest project was the 2015 turnaround of the Borealis cracker and 2019 turnaround of the Preem Lysekil, Sweden. To carry out our subcontractor services, we brought together an international team of 170 professionals. Our biggest challenge was the project’s management and meeting its deadlines. We are proud of having been able to manage it successfully and achieve effective results.

Looking for a reliable partner?

Contact us by phone +37064765226 or by e-mail. We will help you to install, maintain or repair facilities or equipment.