The ten largest tank inspection companies in 2026 serve a global installed base of hundreds of thousands of aboveground storage tanks — from refinery tankage and bulk liquid terminals to LNG import facilities and chemical plant storage. Regulatory pressure under API 653 (aboveground storage tanks), API 570 (piping), and the emerging wave of digital and robotic inspection technology are reshaping how operators manage tank integrity, inspection intervals, and risk-based maintenance programmes. This ranking covers the companies with the broadest tank inspection capability, the largest field engineer networks, and the most advanced technology portfolios in the sector.
How We Ranked the Top 10 Tank Inspection Companies
Rankings are based on the breadth and scale of tank inspection services offered — including API 653 inspections, robotic and remote inspection, non-destructive testing (NDT), corrosion monitoring, fitness-for-service assessments, and risk-based inspection (RBI) programme management. Companies are assessed on geographic reach, technology investment, regulatory body accreditation, and the size of their dedicated tank inspection and integrity management practices.
Standards bodies and certification organisations are referenced separately. For the definitive US standards framework governing aboveground storage tank fabrication and inspection, see the Steel Tank Institute: US Standards Body for Fabricators 2026.
Top 10 Tank Inspection Companies in 2026
1. Bureau Veritas — France
Bureau Veritas is one of the two largest tank inspection companies globally by field engineer headcount and geographic reach. Its oil and gas division delivers API 653 inspections, risk-based inspection programmes, and fitness-for-service assessments at refineries, bulk liquid terminals, and chemical plants across more than 140 countries. Bureau Veritas operates dedicated tank integrity practices in Europe, the Middle East, Asia-Pacific, and the Americas, with long-term framework agreements in place with major integrated oil companies, independent terminal operators, and national oil companies. Its laboratory and materials testing infrastructure supports corrosion analysis, coating assessment, and weld quality evaluation at the same sites where field inspections are conducted.
2. Intertek — United Kingdom
Intertek operates one of the largest independent tank inspection and testing businesses globally, with its Industry Services division covering API 653 tank inspections, ultrasonic thickness testing, magnetic flux leakage (MFL) floor scanning, and corrosion under insulation (CUI) surveys across the refining, petrochemical, and terminal storage sectors. Intertek’s network spans more than 100 countries, with particularly strong presence in the North Sea, US Gulf Coast, Middle East, and Southeast Asia markets. Its Caleb Brett division — one of the oldest names in oil and petrochemical inspection — provides cargo quantity and quality inspection services that extend tank inspection relationships into commercial custody transfer workflows.
3. TÜV SÜD — Germany
TÜV SÜD brings statutory inspection authority to tank inspection in European markets, where its notified body status under EU pressure equipment and hazardous installation regulations gives it a compliance role that independent inspection companies cannot replicate. Its industrial services division covers aboveground storage tank inspection under both API standards and European equivalents (EN 14015, EEMUA 159), with particular depth in Germany, the UK, the Netherlands, and the broader European petrochemical corridor. TÜV SÜD’s combination of regulatory authority and technical inspection capability makes it the default choice for European terminal operators managing tanks under statutory inspection regimes.
4. Applus+ — Spain
Applus+ is a Barcelona-listed testing, inspection, and certification company with a dedicated energy division covering pipeline integrity, tank inspection, and plant turnaround services across Europe, the Americas, and the Middle East. Its RTD division — one of the leading names in industrial NDT — brings advanced ultrasonic, radiographic, and phased array inspection technology to tank floor, shell, and roof assessments. Applus+ has invested in robotic and remote inspection tooling, positioning its energy division to deliver in-service tank inspections that reduce the need for full product removal and confined space entry — a growing priority for operators managing tighter turnaround schedules.
5. Mistras Group — United States
Mistras Group is a US-listed asset protection solutions company with one of the largest dedicated tank inspection practices in North America. Its OneSource programme integrates API 653 inspection, acoustic emission monitoring, MFL floor scanning, and risk-based inspection planning into a single managed service — a model designed to reduce the total cost of tank integrity management for refinery and terminal operators running large tank populations. Mistras operates across the US Gulf Coast, Midwest, and Canada, with international capability in Europe and the Middle East through its subsidiaries. Its technology portfolio includes permanently installed sensor systems that provide continuous structural monitoring between formal inspection intervals.
6. Team Industrial Services — United States
Team Industrial Services, acquired by Crestview Partners and subsequently restructured, operates one of the largest field service networks for industrial inspection and integrity management in North America. Its tank inspection services cover API 653 assessments, leak sealing, hot tapping, and field machining — an integrated capability set that positions Team as a single-source provider for operators managing complex tank maintenance and inspection programmes simultaneously. Team’s Gulf Coast concentration aligns it directly with the US refining and terminal storage market, where large-diameter floating roof tanks and API-regulated inspection cycles generate consistent inspection demand.
7. KOKS Robotics — Netherlands
KOKS Robotics represents the technology vanguard among tank inspection companies in 2026 — its robotic tank cleaning and inspection systems are designed for no-man-entry operations, eliminating confined space entry risk during tank preparation and inspection workflows. KOKS robotic systems can clean, degas, and prepare tanks for inspection without personnel entry, with integrated camera and sensing systems providing condition data during the cleaning pass. For terminal operators managing large populations of hazardous product tanks — chemicals, crude oil, heavy fuel oil — the safety and schedule compression benefits of robotic preparation are driving adoption ahead of traditional manned entry methods.
8. Eddyfi Technologies — Canada
Eddyfi Technologies is the most significant pure-play NDT technology company serving the tank inspection market, with a product portfolio spanning eddy current array, pulsed eddy current, phased array ultrasound, and magnetic flux leakage inspection systems used by field inspectors at terminals and refineries worldwide. Eddyfi’s acquisition strategy has consolidated several specialist NDT technology brands — including Silverwing (MFL tank floor scanning), Applus RTD NDT assets, and others — into a single technology group. While Eddyfi does not operate a field inspection service directly, its tooling is deployed by the majority of the top-ranked tank inspection companies on this list, making it the critical technology enabler across the sector.
9. Square Robot — United States
Square Robot has developed a fully submersible autonomous robot capable of inspecting the floors and lower shells of active storage tanks without taking them out of service — eliminating product removal, tank cleaning, and confined space entry from the inspection workflow entirely. Its in-service inspection model is validated against API 653 requirements and is being adopted by major US terminal operators and refiners seeking to compress inspection downtime and reduce safety exposure. Square Robot’s technology targets one of the highest-cost elements of the tank integrity management cycle — the planned outage required for conventional floor inspection — and has attracted significant investment from the energy sector on the strength of its operational case.
10. NACE International / AMPP — United States
AMPP (the Association for Materials Protection and Performance, formed by the merger of NACE International and SSPC) is the global standards and certification body for corrosion control and protective coatings — disciplines that sit at the core of tank inspection and integrity management. AMPP’s CIP (Coating Inspector Programme) and CP (Cathodic Protection) certifications are mandatory or strongly preferred qualifications for inspection personnel working on storage tanks at major terminal operators and refiners. Its standards — including SP0188 (immersion coatings), SP0294 (internal coatings for petroleum storage tanks), and the NACE corrosion inspection standards — define the technical baseline against which tank condition is assessed across the industry.
Tank Inspection Technology: What’s Changing in 2026
The most significant shift in the tank inspection companies market is the move from scheduled, outage-dependent inspection to continuous and in-service monitoring. Robotic systems from Square Robot and KOKS, permanently installed acoustic emission sensors from Mistras, and pulsed eddy current through-insulation scanning from Eddyfi are collectively reducing the inspection events that require tanks to be taken offline. For operators managing large tank populations — where simultaneous outages create throughput constraints — the operational value of in-service inspection technology is substantial.
Regulatory frameworks are adapting more slowly than the technology. API 653’s risk-based inspection annexes provide a pathway for extended inspection intervals where data quality supports it, but inspector certification, liability frameworks, and insurance requirements are still largely calibrated to the manned entry inspection model. The companies that bridge technology capability with regulatory compliance workflow — rather than offering technology alone — are best positioned to capture the market transition.
For the tank construction and engineering companies that work alongside inspection teams on repair and rehabilitation programmes, see the Top 10 Tank Terminal EPC Companies North America 2026. The broader infrastructure context is in the Tank Terminals: The Complete Global Guide 2026.
What qualifications do tank inspection companies need to inspect storage tanks?
API 653 inspection of aboveground storage tanks must be carried out by an API 653 Certified Inspector — a qualification administered by the American Petroleum Institute requiring demonstrated knowledge of tank design, construction, repair, and alteration standards. In European jurisdictions, inspectors may also require certification under EN 473 / ISO 9712 for non-destructive testing, or national competent authority accreditation where statutory inspection applies.
What is API 653 and why does it matter for tank inspection?
API 653 is the American Petroleum Institute standard for the inspection, repair, alteration, and reconstruction of aboveground storage tanks originally built to API 650. It sets the minimum inspection intervals, acceptance criteria for shell and floor integrity, and the basis for fitness-for-service assessments that determine whether a tank can safely remain in service. Compliance with API 653 is a contractual requirement for most major terminal operators and is referenced by insurance underwriters, environmental regulators, and lenders.
Can storage tanks be inspected without taking them out of service?
Yes, for certain inspection types. Robotic floor inspection systems — such as those developed by Square Robot — can assess tank floor condition while the tank remains in service and product-filled, eliminating the need for product removal and cleaning. Acoustic emission monitoring and pulsed eddy current through-insulation scanning can also provide integrity data without an outage. Full API 653 internal inspection still requires an out-of-service tank for a complete assessment, but risk-based inspection programmes can extend the intervals between full internal inspections where continuous monitoring data is available.
What is the difference between tank inspection and tank cleaning companies?
Tank inspection companies assess structural integrity, coating condition, corrosion rates, and fitness for service — they determine whether a tank is safe to operate and what repairs are required. Tank cleaning companies remove product residues, sludge, and contamination to prepare the tank for inspection or maintenance. The two services are typically sequential — cleaning precedes inspection — and some companies, including KOKS Robotics, offer integrated robotic systems that perform both functions in a single no-man-entry operation.
How often must aboveground storage tanks be formally inspected?
Under API 653, internal inspection intervals are determined by a risk-based assessment of corrosion rate, product service, and tank condition — typically ranging from 5 to 20 years for the internal floor inspection. External inspections are conducted more frequently, typically on an annual or biennial basis. Operators using continuous monitoring technology and risk-based inspection frameworks can qualify for extended intervals between full internal inspections where the data supports it.