Technology / product information

In energy projects—particularly pumped storage hydropower plants—the pressure pipeline (penstock) system requires thick plate fabrication using specialized equipment and strict technical processes.
With long-standing experience in steel structure manufacturing, Lilama 10 has gradually established an integrated production capability, meeting high-quality requirements for both domestic and international projects.

Thick Plate Fabrication Capability at Lilama 10

Integrated production process
From design, plate cutting, rolling, welding, heat treatment to surface coating, Lilama 10 operates a closed-loop manufacturing process that optimizes production time, ensures consistent quality control, and supports reliable delivery schedules.

Practical project experience
Lilama 10 has participated in numerous large-scale steel structure and thick plate fabrication projects, including high-pressure structures, accumulating stable and efficient production know-how.

Skilled technical workforce
With nearly 400 certified welders and mechanical technicians, Lilama 10 is capable of executing complex structural welding works in compliance with international standards.

Key equipment

3-roll plate bending machine (MG, Italy): Suitable for thick plate rolling and forming

Crane systems from 50 to 600 tons: Safe handling and transportation of large-diameter pipes and heavy structures

Diverse welding systems: TIG, MIG/MAG, SAW, semi-automatic and automatic welding for thick sections and load-bearing joints

Large-scale PWHT furnace: For post-weld stress relief and stabilization of mechanical properties

Surface treatment & protection: Shot blasting, anti-corrosion coating, and finishing processes to enhance durability and service life

Thick Plate Fabrication Process for Pumped Storage Hydropower Penstocks

To ensure dimensional accuracy, tightness, and long-term durability of pressure pipelines, Lilama 10 applies the following standardized process:

Step 1 – Material preparation and plate cutting

Steel plates undergo incoming inspection and are cut by CNC machines to achieve design dimensions, minimize tolerances, and improve assembly accuracy.

Step 2 – Plate rolling and pipe forming

Cut plates are rolled into cylindrical sections. Parameters are continuously monitored to ensure roundness, uniform thickness, and structural stability.

Step 3 – Edge beveling and preliminary assembly

Plate edges are beveled according to welding specifications to ensure proper penetration. Pipe sections are aligned and assembled in sequence to maintain straightness and joint consistency.

Step 4 – Structural welding

Semi-automatic and automatic welding methods are applied depending on plate thickness and joint location.
Depending on project requirements, non-destructive testing (UT, MT, RT, or TOFD) is conducted to verify weld quality.

Step 5 – Post-Weld Heat Treatment (PWHT)

After welding, pipe sections are placed in a large-scale PWHT furnace to relieve residual stress and achieve the mechanical properties specified in the design.

Step 6 – Surface cleaning

Shot blasting is performed to remove impurities and create proper surface roughness for coating adhesion.

Step 7 – Anti-corrosion coating

Industrial coating systems are applied under strict process control to ensure corrosion resistance under actual hydropower operating conditions.

Application in Pumped Storage Hydropower Penstock Manufacturing

This fabrication process has been applied in projects involving pressure penstocks for pumped storage hydropower plants, where structures must withstand high loads, maintain excellent tightness, and operate reliably for several decades.
All products undergo heat treatment, inspection, and coating before being delivered to the installation site.

Lilama 10 aims to continue partnering with large-scale energy projects in Vietnam and overseas, particularly those requiring thick plate fabrication and high-pressure steel structures.