Industries
Oil & Gas
Line pipe, OCTG, fittings, flanges, valves, structural steel and process chemicals for upstream operators, midstream pipeline projects and downstream refining and petrochemical facilities.
Upstream, Midstream, Downstream
Oil and gas projects demand a sourcing partner who speaks the specification language. From API 5L line pipe through ASME B16.5 flanges to NACE MR0175 sour service compliance, Olfa supplies material with full documentation — mill test certificates, material traceability, and third-party inspection coordinated on request.
The categories below cover the six lines we ship most often into upstream operators, midstream pipeline projects, and downstream refining and petrochemical facilities.
Our Offerings
Line Pipe
API 5L B through X70, PSL1 and PSL2, ERW / SAWL / SAWH, 2–48 inch. Sour service NACE MR0175. 3LPE / FBE / concrete weight coat on request.
OCTG
API 5CT casing and tubing, H40 through P110. Premium and API connections. CRA and sour grades on request.
Fittings & Flanges
ASME B16.9 buttweld fittings, ASME B16.5 and B16.47 flanges. WN, SO, BL in carbon steel, LTCS, stainless and duplex. 150# through 2500#.
Valves
Gate, globe, check, ball and butterfly. API 6D, 6A, 600 and 602 compliant. Fire-safe and low-emission options.
Structural Steel
Plate (A516-70, A537, A572), beams, angles and channels for skids, platforms and process structures.
Process Chemicals
Caustic soda, methanol, monoethylene glycol, amines, corrosion inhibitors, biocides, sulphur for captive acid plants.
Line Pipe — A Rough Guide
Line pipe specification is driven by service environment. Sweet service allows PSL1 in common grades. Sour service triggers PSL2 with NACE MR0175 compliance. Offshore adds DNV-OS-F101 and typically concrete weight coating.
Our team confirms final spec against your project datasheet.
One Enquiry, Full Documentation
Every order ships with mill test certificates (EN 10204 3.1 or 3.2), NACE compliance where applicable, and full material traceability. Third-party inspection (SGS, BV, TÜV) is coordinated on request.