Pipe fittings for refineries and offshore facilities
Nirotec supplies pipe fittings for refineries, offshore platforms and subsea systems – in duplex, Super Duplex, high-alloy stainless steels and nickel alloys, with complete inspection and certification documentation.
Requirements in refineries and offshore facilities
In the oil, gas and offshore industry, the highest requirements apply to materials, manufacturing and documentation. Piping components must comply with international codes and standards, which set different priorities depending on the application.
For offshore applications, NORSOK M-001 and M-630 are particularly relevant, while in H₂S-containing environments standards such as ISO 15156 (NACE MR0175) or NACE MR0103 define material selection. In pipelines and refineries, standards such as API 5L and the ASME B31 series (B31.3, B31.4 and B31.8) are used, supplemented by DNV-ST-F101 for subsea systems.
In the European context, EN 13480 and the Pressure Equipment Directive 2014/68/EU form the regulatory framework for design, manufacturing and testing.
What Nirotec supplies for refineries and offshore facilities
With our own production and targeted sourcing, we supply pipe fittings across the full range of requirements – from standard components to special solutions made to drawing.
Our components are used in:
Process and transport pipelines in refineries
Crude oil and gas processing plants
Offshore platforms (topside and subsea)
FPSO units (Floating Production Storage and Offloading)
Amine treatment plants (sweet gas)
Sour-service systems with H₂S exposure
Seawater desalination plants (chloride corrosion)
LNG plants and low-temperature applications
Materials & versions
For applications in refineries and offshore facilities, Nirotec processes materials suitable for extreme conditions:
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Duplex & Super Duplex (focus for offshore): 1.4462 (UNS S31803/S32205) · 1.4410 (UNS S32750) · 1.4501 (UNS S32760) PREN > 40 for Super Duplex – maximum resistance to pitting corrosion in chloride environments
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Austenitic stainless steels: 1.4404 (316L) · 1.4435 · 1.4571 – for less aggressive applications
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6Mo & high-alloy steels: 1.4547 (UNS S31254) · 1.4529 (UNS N08926) – for chloride-rich environments and seawater systems
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Nickel alloys: Alloy 625 (2.4856) · Alloy 825 (2.4858) · Alloy C-276 (2.4819) – for extreme applications with H₂S, CO₂, chlorides
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Carbon and low-alloy steels: L245 · L360 · L415 (to API 5L / ISO 3183) – for pipelines and less corrosive process piping, also HIC-tested on request
Material selection is project-specific, taking into account NORSOK M-001, ISO 15156 and customer-specific specifications.
Quality and documentation
Nirotec is certified to ISO 9001 and AD 2000. Typical services for offshore and refinery projects:
- Inspection certificates to EN 10204 (3.1 / 3.2)
- Positive Material Identification (PMI) – 100% on request
- Hardness testing (HV10, HRC) to NACE/ISO 15156
- Non-destructive testing (UT, RT, PT, MT)
- HIC testing (Hydrogen Induced Cracking) on request
- SSCC tests (Sulfide Stress Corrosion Cracking) on request
- Ferrite measurement for duplex materials
- Grain size determination and IK testing
- Third-party inspections by TÜV, Bureau Veritas, DNV, SGS or customer inspectors
- Project-specific ITPs with hold and witness points
Applications & industries
Discover our other industries
At Nirotec, we offer solutions worldwide for industrial piping systems.
Energy and Power Plant Facilities
Nuclear Technology
Hydrogen and Energy Infrastructure
Chemical and Process Industry
Refineries and Offshore Facilities
Apparatus and Mechanical Engineering
Planning a refinery or offshore project?
Nirotec supplies duplex and sour-service pipe fittings with the required documentation – NORSOK-compliant, PMI-tested, on time.