OMV Approved Storage Tank Suppliers: What the Standard Really Requires

OMV, the Vienna-headquartered integrated oil, gas, and chemicals company, operates refineries in Austria, Germany, and Romania with a combined annual refining capacity of around 17.8 million tons. Its largest site, the Schwechat refinery near Vienna, processes roughly 9.6 million tons of crude oil a year — about 192,000–193,700 barrels per day — and sits alongside a Borealis petrochemical complex, making it one of the biggest and most technically complex inland refineries in Europe. Crude, intermediate, and finished-product storage underpins that entire operation, and OMV's ongoing investment in biofuel co-processing, sustainable aviation fuel, and renewable diesel at Schwechat is adding new storage requirements — for biogenic feedstocks and finished renewable fuels — alongside the refinery's conventional tank farm. That's why "approved supplier" status for storage tank fabrication is a specific, audited designation rather than a claim any manufacturer can make on its own. It's granted by OMV or its EPC contractor to individual fabricators after a formal qualification process.

For procurement and engineering teams in Italy sourcing storage tanks for refinery and energy-transition projects of this kind, understanding what that qualification process actually covers is far more useful than searching for a badge. This article explains what OMV-linked tank vendor approval involves, the engineering baseline behind it, and what to look for when qualifying a manufacturer for OMV-linked or OMV-grade storage tanks.

What OMV Vendor Approval Actually Means

Vendor qualification for storage tank fabrication on a European refinery project typically involves a detailed audit of a manufacturer's quality management system, plate-rolling and shell-erection practices, welding procedures, material control, foundation and settlement interface competence, and prior track record delivering tanks that pass hydrostatic and vacuum-box testing on first attempt. That audit is usually carried out by the plant owner's engineering and inspection function, or by a third-party inspection agency acting on its behalf, and the resulting approval is specific to the named manufacturer and the tank categories it covers.

Because this status is granted directly by OMV or its contractor, it isn't something a supplier can claim by general reputation. What buyers can reasonably assess before any formal audit is whether a manufacturer's design, fabrication, and testing practices already meet the standard that a major European refinery's storage infrastructure demands.

The Engineering Baseline Behind OMV-Grade Storage Tanks

A storage tank on a site like Schwechat has to meet European design and safety standards while holding a broad mix of products — crude, intermediate hydrocarbon streams, finished fuels, and increasingly biogenic feedstocks or renewable fuel components — within a large, long-established refinery footprint. The requirements behind OMV-grade tank fabrication reflect that combination:

Design Codes

EN 14015 governs the design and construction of vertical, cylindrical, above-ground welded steel tanks for the storage of liquids at ambient temperature and above, and is the standard most commonly referenced for European refinery tankage, with API 650 also used where a project specification calls for it. Foundation, wind, and seismic loading are checked against the specific site conditions, and roof type is selected against the stored product's vapour characteristics and applicable European emissions requirements.

Material Traceability

Full mill test certificates and heat-number traceability for shell plates, roof and floor plates, and structural steel, carried through rolling, cutting, and welding, and into the as-built documentation package delivered with the tank.

Shell, Roof, and Floor Design for Service Conditions

Plate thickness calculated by course for hydrostatic head and specific gravity of the stored product, corrosion allowance sized for the product and site environment, and floor design that accounts for foundation settlement and future in-service inspection access under European in-service inspection regimes such as EEMUA 159.

Welding Procedure Qualification

WPS and PQR documentation covering shell, floor, and roof welds, with welders individually qualified under EN ISO 9606 or ASME Section IX as specified, and welding sequence controls applied to manage distortion on large-diameter shells.

Non-Destructive Testing

Radiographic testing of shell butt welds, vacuum-box or magnetic-particle testing of floor and roof welds, and visual inspection of every weld against acceptance criteria before the tank is released for hydrostatic testing.

Hydrostatic Testing and Settlement Monitoring

Water-filling of the completed tank to design level with staged settlement readings, followed by tank-bottom vacuum-box retest where required, before the tank is handed over ready for product service.

Third-Party Inspection

Hold-point sign-off from an accredited inspection body such as TÜV, Bureau Veritas, Lloyd's Register, or DNV at critical stages — plate receipt, floor and shell weld completion, and final hydrotest — giving the end client independent verification that the completed tank matches its design package.

A manufacturer applying this level of control as standard practice — not only when a named end client is involved — is generally the one positioned to succeed if and when a formal OMV-linked audit takes place.

Where Notdstone Fits

Notdstone designs and fabricates storage tanks and other process equipment for process industries, serving Italy, the GCC, and international markets, with more than three decades of engineering experience across the team. Our fabrication and QA/QC processes are structured around the baseline described above — documented material traceability, code-qualified welding, comprehensive NDT, and hydrostatic testing before handover.

To be clear with buyers researching this topic: formal vendor approval with OMV is issued directly by OMV or its appointed contractor to specific manufacturers following its own audit process, and we're not claiming that status here. What we can speak to with confidence is the engineering rigor our storage tanks are built to on every project.

Equipment Built to That Standard

Storage Tanks

API 650/620-referenced tanks for liquids, gases, chemicals, and petroleum products.

Process Skids

Factory-assembled modular skids integrating vessels, pumps, piping, and instrumentation to compress site installation time.

Pressure Vessels

ASME Section VIII-compliant vessels engineered for safe containment under demanding pressure and temperature conditions.

Reactors

Custom-engineered reactors for controlled chemical processing and reaction management.

Heat Exchangers

TEMA-designed shell-and-tube units for heating, cooling, condensation, and energy recovery.

Columns

Distillation, absorption, and stripping columns engineered for process efficiency in chemical and petrochemical service.

FAQ

What does "OMV approved" mean for a storage tank supplier?

It means the manufacturer has been formally audited and accepted by OMV or its appointed contractor, covering their design, fabrication, and testing capability for storage tank packages.

What design codes apply to storage tanks on OMV-linked projects?

EN 14015 is the standard most commonly referenced for above-ground welded steel storage tanks on European refinery sites, with API 650 also used where a project specification calls for it, and in-service inspection typically following a European regime such as EEMUA 159.

How does tankage for biofuel and renewable-fuel storage differ from conventional refinery tankage?

Biogenic feedstocks and renewable fuel components can bring different corrosion, stability, and material-compatibility considerations than conventional crude and refined products, so tank material selection, internal coatings, and nitrogen blanketing or other stabilisation measures are assessed against the specific feedstock or product rather than assumed from a standard hydrocarbon tank design.

Can a manufacturer outside Austria supply OMV-linked storage tanks?

Yes, provided their code compliance, material traceability, and third-party inspection arrangements meet the project specification, and export and transport logistics support delivery of shop-fabricated components or field-erection crews to the relevant OMV site in Austria, Germany, or Romania.

How can I verify a supplier's vendor-approval claim?

Ask for written confirmation of the approval status and its exact scope — which tank types and sizes it covers — rather than relying on a general claim.

Working With Notdstone

If your project requires storage tanks engineered to European and international standards and manufactured under documented quality control, our engineering team can review your process requirements and provide a project-specific proposal. Get in touch with Notdstone to discuss your requirements.