Repsol Steel LLP is a trusted weld neck flange supplier, supplying a comprehensive range of WN flanges to industrial buyers, EPC contractors, and procurement teams across Africa, USA, Mexico, Oman, and Europe. Weld neck flanges are manufactured with a long tapered hub that transitions smoothly into the pipe wall — providing excellent stress distribution and making them the preferred choice for high-pressure, high-temperature, and cyclic-load piping systems. We supply WN flanges in A105 carbon steel, A182 stainless and alloy steel, A350 low-temperature steel, and duplex grades — with full documentation, EN 10204 3.1 certification, and international packaging standards.
With over 25 years of combined industry experience and a proven export network, we serve clients across Africa, the United States, Mexico, Oman, and Europe — including Oil & Gas, petrochemical, refinery, power generation, chemical processing, and marine facilities. Our supply operations are structured to meet the documentation, packaging, and compliance requirements of international industrial procurement — including Material Test Certificates (MTC), dimensional inspection reports, NACE compliance, PMI testing, radiography, and third-party certification where required.
Whether you require standard A105 weld neck flanges for a refinery in Oman, A182 F316 WN flanges for a petrochemical plant in Mexico, F11/F22/F91 weld neck flanges for a high-temperature power plant in Europe, or long weld neck flanges for a pressure vessel in Africa or the USA — Repsol Steel LLP delivers the right weld neck flange solution, on time, with complete export documentation.
A complete weld neck flange supply portfolio covering standard WN, long weld neck, reducing WN, and RTJ weld neck flanges — engineered for high-pressure and high-temperature piping systems across Africa, USA, Mexico, Oman, and Europe.
Standard WN flanges with a long tapered hub that provides smooth stress distribution between pipe and flange. Used in high-pressure and high-temperature piping systems where cyclic loading is a concern.
Grades: A105, A182, A350 LF2
Compliance: ASME B16.5, B16.47, EN 1092-1
Size Range: ½" to 60"
Long weld neck (LWN) flanges with an extended neck used as a nozzle on pressure vessels, columns, and reactors. The extended neck allows direct butt welding to the vessel wall.
Grades: A105, A182, A350 LF2
Compliance: ASME B16.5, B16.47
Size Range: ½" to 24"
Ring Type Joint (RTJ) weld neck flanges for high-pressure and high-temperature service. The RTJ face provides a metal-to-metal seal ideal for critical gas and hydrocarbon service.
Grades: A105, A182 F316, F11, F22, F91
Compliance: ASME B16.5, API 6A
Size Range: ½" to 36"
Reducing weld neck flanges with a bore smaller than the flange size, used to connect a smaller pipe to a larger flange. Ideal for transitions in high-pressure piping systems.
Grades: A105, A182, A350 LF2
Compliance: ASME B16.5
Size Range: ½" to 24"
Raised face weld neck flanges — the most common face type — where the gasket sits on a raised ring above the bolting surface for improved sealing in general and high-pressure service.
Grades: A105, A182, A350 LF2
Compliance: ASME B16.5, EN 1092-1
Size Range: ½" to 60"
Custom-manufactured weld neck flanges in non-standard sizes, bores, hub lengths, materials, and face types per drawings and project specifications — with quick turnaround times.
Grades: A105, A182, A350, Duplex, Exotic
Compliance: ASME B16.5, DIN, Custom Drawings
Size Range: ½" to 60"
Weld neck flanges are supplied in different materials and grades to suit specific pressure, temperature, and media conditions across Africa, USA, Mexico, Oman, and Europe. The material grade determines the mechanical strength, corrosion resistance, and temperature capability of the WN flange. We supply weld neck flanges in the following materials and grades:
All weld neck flanges we supply are accompanied by Material Test Certificates (MTC to EN 10204 3.1) confirming the exact grade, mechanical properties, and heat number — ensuring full traceability and compliance with international project specifications. PMI testing is available on request.
| Parameter | Specification |
|---|---|
| Flange Type | Weld Neck (WN), Long Weld Neck (LWN), Reducing WN, RTJ WN, RF WN, Custom WN |
| Materials | Carbon Steel (A105), Stainless Steel (F304, F316, F321), Alloy Steel (F11, F22, F91), Low-Temp (LF2), Duplex (F51, F53, F55), Exotic Alloys (Monel, Inconel, Hastelloy) |
| Size Range | ½" to 60" standard; larger sizes available on request |
| Pressure Classes | PN6, PN10, PN16, PN25, PN40 (EN 1092-1); Class 150, 300, 600, 900, 1500, 2500 (ASME B16.5) |
| Face Types | RF (Raised Face), FF (Flat Face), RTJ (Ring Type Joint) |
| Standards Compliance | ASME B16.5, ASME B16.47, ASTM A105, A182, A350, EN 1092-1, DIN, BS, API 6A |
| Export Documentation | Commercial Invoice, Packing List, Bill of Lading, Certificate of Origin, MTC (EN 10204 3.1) |
| Inspection Options | PMI testing, ultrasonic testing, radiography, third-party inspection (SGS, BV, TUV, Intertek) available on request |
| Additional Documentation | Hardness test reports, NACE compliance, H2S service documentation available on request |
Weld neck flanges are the preferred choice for high-pressure, high-temperature, and cyclic-load piping systems. Before finalizing a weld neck flange for projects in Africa, USA, Mexico, Oman, or Europe, our technical team recommends evaluating four key factors:
If you are unsure which weld neck flange specification best suits your application, our technical team is available to review your piping drawings, process data, and project specifications — and recommend the most suitable WN flange solution.
We have supplied weld neck flanges to buyers across Africa, the USA, Mexico, Oman, and Europe — building a supply track record that reflects reliability, compliance, and on-time delivery.
Every weld neck flange shipment is accompanied by complete export documentation — Commercial Invoice, Packing List, Bill of Lading, Certificate of Origin, Material Test Certificates (MTC to EN 10204 3.1), and third-party inspection reports on request.
Our weld neck flanges comply with ASME B16.5, ASME B16.47, ASTM A105, A182, A350, EN 1092-1, DIN, and API 6A standards — ensuring that products meet the exact specifications of international industrial projects.
Weld neck flanges are packed in durable, moisture-resistant export-grade packaging designed for long-distance sea, air, and road transport — protecting the tapered hub, bevel end, and face finish from factory to destination.
We support a range of Incoterms — FOB, CIF, CFR, EXW, DAP — and coordinate with trusted freight partners for sea, air, and multimodal shipments to major ports across Africa, USA, Mexico, Oman, and Europe based on buyer preference.
Our support team assists buyers with grade selection, WN flange specification review, face type selection, documentation, shipping coordination, and post-delivery follow-up — ensuring a smooth experience at every stage.
Repsol Steel LLP supplies weld neck flanges to a wide range of process industries across Africa, USA, Mexico, Oman, and Europe where high-pressure containment, high-temperature service, and reliable butt-welded connections are essential for safety and operational reliability.
A105 and A350 LF2 weld neck flanges supplied for wellhead equipment, pipeline systems, process piping, and high-pressure transfer lines in upstream, midstream, and downstream operations across Africa, USA, Mexico, Oman, and Europe.
A182 F316 and duplex weld neck flanges supplied for reactors, heat exchangers, process piping, and storage systems handling hydrocarbons at high pressures and temperatures.
F11, F22, and F91 weld neck flanges supplied for high-temperature and high-pressure process piping in crude distillation, catalytic cracking, and hydroprocessing units.
High-temperature F11, F22, and F91 weld neck flanges supplied for boilers, steam systems, turbine connections, and high-pressure auxiliary piping in thermal and combined-cycle power plants.
Long weld neck (LWN) flanges supplied as nozzles for pressure vessels, columns, reactors, and heat exchangers — allowing direct butt welding to the vessel wall.
F304, F316, and F904L weld neck flanges supplied for aggressive chemical and corrosive media applications in chemical plants, storage tanks, and process equipment.
Weld neck flanges supplied to fabrication units and EPC contractors for piping spools, skids, modular systems, and industrial assemblies — with quick turnaround times and documentation support.
Repsol Steel LLP is recognized as a reliable weld neck flange supplier for procurement teams, EPC contractors, and maintenance projects across Africa, the USA, Mexico, Oman, and Europe. Our export documentation, packaging, and standard compliance are structured for smooth cross-border supply to buyers worldwide — ensuring your weld neck flanges arrive on time, in specification, and ready for installation.
Africa: Oil & Gas, mining, refinery & industrial piping projects
USA: Oil & Gas, chemical, power generation & EPC supply
Mexico: Refinery, petrochemical & process industry projects
Oman: Oil & Gas, petrochemical, desalination & refinery projects
Europe: Chemical, power, marine & industrial piping supply
All weld neck flanges are supplied with material certificates, dimensional inspection reports, PMI testing, radiography, and third-party certification as required by project specifications.
Yes. We are a leading weld neck flange supplier serving buyers across Africa, the USA, Mexico, Oman, and Europe — offering standard WN, long weld neck (LWN), reducing WN, RTJ WN, and custom WN flanges in A105, A182, A350 LF2, duplex, and exotic alloys.
A weld neck flange has a long tapered hub that transitions smoothly into the pipe wall. It is butt welded to the pipe, providing superior stress distribution and a continuous metal joint that can be radiographically (X-ray) tested. WN flanges are preferred for high-pressure, high-temperature, and cyclic-load piping systems.
We supply weld neck flanges in ASTM A105 (carbon steel), ASTM A182 F304, F316, F321 (stainless steel), ASTM A182 F11, F22, F91 (alloy steel), ASTM A350 LF2 (low-temp carbon steel), and duplex grades F51, F53, F55.
Standard WN flanges are used for pipe-to-pipe connections. Long weld neck (LWN) flanges have an extended neck and are used as nozzles on pressure vessels, columns, and reactors — allowing direct butt welding to the vessel wall with a longer hub for additional reinforcement.
Yes. We offer custom sizes, bores, hub lengths, pressure classes, materials, face types, and weld neck flange configurations based on drawings, piping specifications, and project requirements — with quick turnaround times.
Send us your weld neck flange specifications, grade requirements, or drawings. Our export team will respond within 24 hours with a tailored quotation.
Repsol Steel LLP is a leading manufacturer and stockholder of high-quality piping products, serving the Oil, Gas, Petrochemical, and Nuclear industries with reliable engineering solutions.
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