DNO Approved Process Skid Suppliers: What the Standard Really Requires
DNO ASA is a Norwegian oil and gas operator with production and development activities across the North Sea, Kurdistan region of Iraq, and other international assets. When a project's process skids are ultimately destined for DNO-operated fields or DNO-affiliated development work, "approved supplier" isn't a marketing phrase — it's a specific, audited status that DNO or its EPC contractor grants to individual manufacturers after a formal qualification process. For procurement and engineering teams in Italy sourcing process skids for this kind of work, understanding what that process actually involves is far more useful than searching for a badge.
This article explains what DNO-linked vendor approval covers, the engineering baseline it's built on, and what to look for when qualifying a process skid manufacturer for DNO-linked or DNO-grade projects.
What DNO Vendor Approval Actually Means
Vendor qualification on DNO projects typically involves a detailed audit of a manufacturer's quality management system, welding procedures, material control, instrumentation and controls integration, and documented fabrication history. That audit is usually carried out by DNO's own engineering and inspection teams, or by a third-party inspection agency acting on its behalf, and the resulting approval is specific to the manufacturer and the equipment category audited.
Because this status is granted directly by DNO to a named manufacturer, it isn't something any supplier can claim without going through that process. What buyers researching suppliers can assess independently — before any formal audit — is whether a manufacturer's engineering and quality practices are already built to the level DNO requires.
The Engineering Baseline Behind DNO-Grade Process Skids
Regardless of a skid's final destination, the technical requirements that underpin DNO-grade fabrication are largely the same requirements that govern quality process skid manufacturing generally:
Design Codes
ASME B31.3 for process piping and ASME Section VIII for any pressure-containing vessels mounted on the skid are the standard reference codes, with client engineering standards layered on top for field-development projects.
Material Traceability
Full mill test certificates and heat-number traceability carried from raw plate, pipe, and fittings through to the finished, assembled skid.
Structural and Layout Engineering
Skid frame design that accounts for lifting, transport, and installed loading, with equipment layout engineered for accessibility, maintenance, and operator safety.
Piping and Welding Procedure Qualification
WPS and PQR documentation, with welders individually qualified under ASME Section IX, and piping fabricated and tested in accordance with the governing code.
Instrumentation and Controls Integration
Factory-installed instrumentation, control panels, and wiring, with loop checks and functional testing carried out before the skid leaves the shop.
Non-Destructive Testing
Radiographic or ultrasonic testing of piping welds, and magnetic particle or dye penetrant testing on structural and pressure-critical joints where applicable.
Factory Acceptance Testing
A documented FAT covering mechanical completion, pressure testing, and functional performance of the fully assembled skid before shipment.
Third-Party Inspection
Hold-point sign-off from an accredited inspection body such as Lloyd's Register, Bureau Veritas, TÜV, or DNV at critical stages of fabrication.
A manufacturer that applies this level of control as standard practice — not only on projects with a named end client — is generally the one positioned to succeed if and when a formal DNO audit takes place.
Where Notdstone Fits
Notdstone manufactures customized process skids for the oil, gas, and 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 technical baseline described above — documented material traceability, ASME IX-qualified welding, factory-integrated instrumentation, and full factory acceptance testing before delivery.
To be clear with buyers researching this topic: formal vendor approval with DNO is issued directly by DNO 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 process skids are built to on every project.
Equipment Built to That Standard
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.
Heat Exchangers
TEMA-designed shell-and-tube units for heating, cooling, condensation, and energy recovery.
Storage Tanks
API 650/620-referenced tanks for liquids, gases, chemicals, and petroleum products.
Columns
Distillation, absorption, and stripping columns engineered for process efficiency in chemical and petrochemical service.
Reactors
Custom-engineered reactors for controlled chemical processing and reaction management.
FAQWhat does "DNO approved" mean for a process skid supplier?
It means the manufacturer has been formally audited and accepted by DNO, covering their quality system, welding and piping procedures, and testing capability for skid fabrication.
What design code applies to DNO-linked process skids?
ASME B31.3 governs the process piping, with ASME Section VIII applying to any pressure vessels mounted on the skid, often supplemented with DNO's own engineering standards for field-specific work.
Do DNO-grade process skids require special materials or coatings?
For sour service or corrosive process streams, yes — NACE-compliant materials, corrosion-resistant alloys, or specialized internal and external coatings may be specified instead of standard carbon steel.
Can a manufacturer outside Norway or Iraq supply DNO-linked process skids?
Yes, provided their code compliance, material traceability, and third-party inspection arrangements meet the project specification and export logistics support delivery of large, pre-assembled skid modules.
How can I verify a supplier's vendor-approval claim?
Ask for written confirmation of the approval status and its exact scope — which equipment categories it covers — rather than relying on a general claim.
Working With Notdstone
If your project requires process skids engineered to 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.
