Experience you can rely on

At OSS, our goal is to provide long-term value. With 2 decades of experience, we’ve built a strong team of skilled professionals who handle complex projects in international markets. We’re ready to share our knowledge and help you succeed.

More than

decades of experience

Over

projects Implemented

And more than

millions euro turnover in 2025

Who we are

Crafting Ideas Backed by Diverse Practical Expertise

AREAS OF COMPETENCE

OSS specialises in the prefabrication, installation, maintenance and repair of technological pipelines, storage tanks, pressure vessels, skids and industrial equipment.
We deliver complex industrial solutions with a strong focus on quality, safety and compliance with international standards.

AREAS OF ACTIVITY

OSS operates across a broad spectrum of industrial sectors, with experience gained in virtually all major industries.
Our teams are used to working in diverse and demanding environments – from refineries and energy facilities to complex industrial plants and infrastructure projects.
This wide-ranging experience enables us to quickly adapt to different project requirements, standards and working conditions, regardless of location or industry.

WHY CHOOSE OSS?

With over two decades of experience, OSS has built a strong reputation as a reliable international partner.
More than 90% of our projects are executed abroad, demonstrating our ability to adapt to different regulatory environments and meet country-specific requirements.
Our main asset is our people – highly qualified professionals who can work both as cohesive teams and as individual specialists, ensuring flexibility and consistent performance across projects of any scale.
We focus on open and transparent cooperation, delivering high-quality services on time and creating long-term value for our clients.

OUR PARTNERS AND IMPLEMENTED PROJECTS

OSS has successfully delivered projects across refineries, industrial plants and construction sites worldwide, earning the trust of international partners.
Our track record includes major refinery turnarounds in Sweden. The largest project to date – PREEM Lysekil 2025 – where we managed a team of 450 professionals and delivered complex work within strict deadlines.
These projects reflect our capability to execute large-scale, high-complexity work and consistently meet client expectations.

WHY US

The Core Principles Fueling Our Every Endeavor

2 decades in the Market

Over its development period, OSS has accumulated extensive knowledge and experience. The company seeks open and fair partnerships with clients.

Highly Qualified Specialists

OSS’s main asset is its qualified personnel who can work both in teams and individually as professionals in their fields. The priority is timely delivery of high-quality services according to international standards.

90% of Services Delivered Abroad

The company has deep knowledge of work safety and quality requirements, enabling compliance with each country’s standards. OSS has all necessary personnel, equipment, permits, and licenses to perform the mentioned types of work.

Certificates and Awards

Certified by

HSE

Health, Safety and Environment

OSS safety culture

At Oil ship service we particularly focus on reducing sickness absence, the frequency of strain injuries, as well as accidents and incidents on our projects.

Trainings and Certificates

ISO 45001:2018, SSG, Hot works, Work at heights & fall protection, Rigging & signalperson, Working with mobile platforms, Fire, entry and supervision of hot works, Self-contained breathing apparatus, Gas detector & radio usage, CPR & first aid, VCA.

6 lifesaving rules

Work authorization, Hot works, Works at heights, Confined space, Line of fire, Energy isolation.