Engineering steel solutions
for the industries that move the world.
More than 35 years manufacturing critical welded structures for hydroelectric, offshore wind, naval and industrial clients worldwide.
Featured Projects
From hydroelectric penstocks to offshore wind jackets — explore a selection of our most representative steel fabrication projects.
Penstocks — Gorona del Viento
Fabrication of two penstocks weighing 1,686 tonnes for a hydroelectric plant with a 625-metre head and an average gradient of 40%.
Offshore Nodes — Wikinger & East Anglia One
Fabrication of structural nodes and boat landings for offshore wind jackets. Weld rejection rate below 0.25%.
Tanks & Pressure Vessels
Over 4,000 tanks installed across Galicia and northern Portugal for liquid fuels. Fabrication of pressure vessels for industrial applications.
Naval Blocks
Prefabrication of blocks for vessels and naval equipment under Classification Society (IACS) requirements.
Our clients include leading energy companies, EPC contractors, and shipyards across Europe and beyond.
Rotelu delivered exceptional quality on the Gorona del Viento penstocks. Their welding and dimensional control exceeded our expectations.
The offshore node fabrication for Wikinger achieved the lowest rejection rate we have seen across all suppliers. A truly reliable partner.
We have worked with Rotelu for over 15 years on pressure vessel supply. Their consistency and on-time delivery are unmatched.
Core Capabilities
Hydroelectric Penstocks
End-to-end engineering, fabrication, and installation of high-pressure penstocks for hydroelectric plants, including bifurcations, expansion joints, and support structures.
- Heavy plate forming (up to 75 mm thickness)
Offshore Wind Components
Fabrication of structural nodes, boat landings, transition pieces, and other critical components for offshore wind jacket foundations and topsides.
- Complex tubular joint welding (XXT grade)
Shipbuilding & Naval
Prefabrication of curved and flat block sections for commercial vessels, naval ships, and offshore units under IACS classification.
- Block assembly and pre-outfitting
Pressure Vessels & Tanks
Design and fabrication of pressure vessels, storage tanks, and process equipment for the oil & gas, chemical, and energy sectors.
- ASME VIII Div. 1 & PED 2014/68/EU
From concept to delivery — a disciplined, quality-driven workflow that ensures every project meets the highest standards.
1. Technical Review
In-depth review of specifications, drawings, and material requirements. We identify critical points and optimise the fabrication approach.
1. Technical Review
In-depth review of specifications, drawings, and material requirements. We identify critical points and optimise the fabrication approach.
2. Material Procurement
Sourcing certified steels and consumables from approved mills. All materials are traceable and tested before acceptance.
2. Material Procurement
Sourcing certified steels and consumables from approved mills. All materials are traceable and tested before acceptance.
3. Plate Preparation
CNC cutting, bevelling, and edge preparation. Plates are marked and grouped for efficient nesting and minimal waste.
3. Plate Preparation
CNC cutting, bevelling, and edge preparation. Plates are marked and grouped for efficient nesting and minimal waste.
4. Forming & Rolling
Cold and hot forming of plates into cylindrical shells, cones, and complex geometries using our heavy-duty rolling equipment.
4. Forming & Rolling
Cold and hot forming of plates into cylindrical shells, cones, and complex geometries using our heavy-duty rolling equipment.
5. Welding & Assembly
Multi-process welding (SAW, FCAW, SMAW) by qualified welders. All procedures follow approved WPS and are witnessed by inspectors.
5. Welding & Assembly
Multi-process welding (SAW, FCAW, SMAW) by qualified welders. All procedures follow approved WPS and are witnessed by inspectors.
6. Quality Control & NDT
100% inspection programme including visual, dimensional, ultrasonic, magnetic particle, and radiographic testing as required.
6. Quality Control & NDT
100% inspection programme including visual, dimensional, ultrasonic, magnetic particle, and radiographic testing as required.
7. Surface Treatment
Blast cleaning to SA 2.5, primer and final coating application in controlled conditions. Certified coating inspectors oversee all layers.
7. Surface Treatment
Blast cleaning to SA 2.5, primer and final coating application in controlled conditions. Certified coating inspectors oversee all layers.
8. Logistics & Delivery
Transport engineering, sea-fastening design, and just-in-time delivery to site or shipyard. Full traceability documentation included.
8. Logistics & Delivery
Transport engineering, sea-fastening design, and just-in-time delivery to site or shipyard. Full traceability documentation included.
Welding manuals, standards, and technical resources for professionals
Complete welding manual covering SMAW, GMAW (MIG/MAG), GTAW (TIG), FCAW, and SAW processes. Includes electrode classification (AWS), welding machine types, polarity, amperage tables, and safety. 72 pages.
Introductory welding guide covering SMAW, MIG/MAG, TIG, and oxyfuel processes. Includes basics of weldability, materials, safety equipment, and joint preparation. 21 pages.
Certifications & Standards
We hold internationally recognised certifications that attest to our quality, safety, and technical capability.
ISO 3834-2
Full quality standard for fusion welding of metallic materials. Covers all fabrication stages from design through final inspection.
EN 1090 EXC4
Execution class 4 — the highest category for the fabrication of steel structures. Required for seismic and fatigue-loaded structures.
PED 2014/68/EU
Pressure Equipment Directive for the design and manufacture of pressure vessels and assemblies above specific pressure limits.
IACS Classification
Approved by member societies of the International Association of Classification Societies for naval and offshore structural fabrication.
Facilities & Equipment
Our workshop in A Coruña, Spain is equipped to handle heavy, complex steel fabrication projects from start to finish.
Workshop Capacity
3,600 m² total facility with 2,250 m² of covered workshop space. Maximum height under hook: 6.7 m. Maximum workpiece diameter: 5.0 m. Maximum length: 75 m.
Crane & Handling
2 x 16-tonne bridge cranes and 5 x 10-tonne bridge cranes for flexible and precise heavy-component handling across the workshop floor.
Welding Equipment
9 multi-process welding machines (MIG/MAG, TIG, FCAW, SMAW) plus 2 submerged arc welding (SAW) columns for automated longitudinal and circumferential seams.
Plate Processing
CNC oxyfuel and plasma cutting tables, heavy-duty plate rolls (up to 75 mm), bevelling machines, and hydraulic press for forming complex geometries.
Management Team
Experienced professionals committed to quality, precision, and continuous improvement across every project.
José Ramón Pardo
General Manager
Over 30 years of leadership in steel fabrication and industrial project management. Drives the company's strategic vision and operational excellence.
Juan Carlos López
Technical Director
Expert in welding engineering and heavy fabrication. Oversees all technical approvals, WPS qualification, and quality assurance systems.
María Rodríguez
Quality Manager
Responsible for ISO 3834-2 and EN 1090 compliance. Leads the NDT team and ensures every product meets the strictest inspection criteria.
Ángel Fernández
Production Manager
Manages workshop operations, production planning, and resource allocation. Known for achieving on-time delivery without compromising quality.
Tell us about your project — our team will respond within 24 hours with a preliminary assessment.