FABRICATION SUR MESURE

Manufacturing of Large Vertical Steel Storage Tanks

Manufacturing Capability Overview

The manufacturing of large vertical steel storage tanks requires strict control of materials, fabrication processes, welding quality, and inspection procedures.
As a professional storage tank manufacturer, we provide integrated fabrication solutions for large-capacity vertical tanks used in oil, chemical, water, and industrial applications.

Our manufacturing capability covers:

• Heavy steel plate processing
• Precision cutting, rolling, and forming
• Qualified welding procedures
• Comprehensive quality inspection and testing
• Preparation for field erection and on-site construction

Manufacturing quality is the foundation of storage tank safety and service life.

Raw Material Control and Steel Plate Processing

All steel plates used in our storage tanks are sourced from qualified mills and inspected upon arrival.

Material control includes:

• Steel grade verification (Q235B, Q345R, ASTM A36, ASTM A516, etc.)
• Plate thickness and dimensional inspection
• Material traceability and certification (MTC)

Steel plate processing capabilities include:

• CNC cutting and beveling
• Plate rolling for large-diameter shells
• Edge preparation for automatic welding

Strict material control ensures consistency between design calculations and actual fabrication.

Shell, Bottom, and Roof Fabrication

Shell Fabrication

• Rolling and forming of shell plates
• Accurate control of roundness and verticality
• Pre-assembly for dimensional verification

Bottom Fabrication

• Bottom plate layout and fit-up
• Annular plate installation
• Welding sequence control to minimize deformation

Roof Fabrication

• Fixed roof panel fabrication
• Floating roof pontoon assembly
• Structural component fitting and alignment

Each fabrication stage follows approved procedures to ensure dimensional accuracy and structural integrity.

Welding Process and Quality Control

Welding is a critical process in storage tank manufacturing.
All welding activities are carried out in accordance with approved Welding Procedure Specifications (WPS).

Our welding quality control includes:

• Qualified welders and welding operators
• Automatic and semi-automatic welding processes
• Control of welding parameters and sequence
• Visual inspection and non-destructive testing (RT, UT, MT, PT)

Dimensional Control and Pre-Assembly

Before shipment or field erection, fabricated components undergo strict dimensional checks.

Inspection items include:

• Plate dimensions and tolerances
• Nozzle orientation and elevation
• Shell roundness and alignment

Pre-assembly ensures that components can be installed smoothly during on-site construction, reducing installation risks and rework.Surface Treatment and Corrosion Protection

Surface treatment is performed according to project-specific requirements and operating conditions.

Typical processes include:

• Abrasive blasting to specified standards
• Application of internal and external coating systems
• Coating thickness measurement and inspection

Proper corrosion protection significantly extends the service life of storage tanks, especially in harsh environments.

Preparation for Field Erection and Delivery

Fabricated components are properly marked, packed, and prepared for transportation to the project site.

Our preparation includes:

• Component identification and labeling
• Protection of machined and welded surfaces
• Documentation for installation and inspection

This ensures efficient on-site assembly and construction.

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