Vertical storage tanks are critical pressure-bearing and storage facilities widely used in petroleum, chemical engineering, water treatment, food and beverage, grain and oil, energy storage and other industrial sectors. The operational safety, corrosion resistance, service life and sealing performance of finished storage tanks are fundamentally determined by raw material selection and the precision of raw material processing and manufacturing. In strict accordance with international and industrial manufacturing standards, we carry out full-process quality control from raw material procurement to finished tank forming, ensuring each vertical storage tank operates stably and reliably under complex working conditions.

The raw material system of vertical storage tanks is dominated by high-performance metal plates, supplemented by supporting welding materials, anti-corrosion coatings and auxiliary structural sections, to match different storage media, pressure levels and service environments.

For conventional medium storage such as industrial water, diesel oil and neutral chemical solvents, carbon structural steel is the primary raw material, featuring high strength, good plasticity, convenient welding and processing, and cost-effectiveness. For corrosive media including acid, alkali, salt solutions and food-grade materials, stainless steel such as 304, 304L, 316 and 316L is the preferred option, with excellent oxidation and corrosion resistance to avoid medium contamination and tank wall erosion. For high-pressure and low-temperature working conditions, low-alloy high-strength steel is selected to improve structural bearing capacity and resist low-temperature brittleness. In addition, specialized welding electrodes or wires, high-performance anti-corrosion primers and topcoats, and reinforcing sections are strictly matched with the main materials to maintain the consistency of overall product performance.

Raw material processing is a core part of vertical storage tank manufacturing, and all processing procedures follow standardized operating rules to ensure material dimensional accuracy and mechanical properties.

The first step is incoming inspection of raw materials. Each batch of steel plates is tested for chemical composition, mechanical properties, surface quality and thickness deviation, and unqualified materials are rejected directly. After passing the inspection, the steel plates go through the cutting process. CNC plasma cutting and laser cutting technologies are adopted to cut the plates into standard blanks in line with tank design drawings, with accurate dimensions and smooth cuts free of burrs and notches.

Then comes the leveling and heat treatment process. Leveling eliminates plate deformation caused by transportation and rolling, while heat treatment including annealing and normalizing relieves internal stress of steel, improves material toughness and plasticity, and prevents cracking and deformation in the subsequent tank rolling and welding. For stainless steel and special alloy materials, passivation treatment is added to enhance surface corrosion resistance. Finally, processed semi-finished raw materials are sorted and stored with complete material traceability codes, realizing full-process traceability.

On the basis of high-standard raw material processing, vertical storage tanks enter the integrated precision manufacturing stage to convert qualified raw materials into finished storage products.

The first procedure is plate rolling. Professional plate rolling machines form the cut steel blanks into arc-shaped tank wall components, ensuring uniform radian and tight fitting to lay a solid foundation for tank assembly. Then the assembly and welding process begins. Workers assemble the tank wall, tank bottom and tank top components accurately, and adopt submerged arc welding, manual arc welding and argon arc welding suitable for raw material properties to conduct full-position welding. Welding seams are strictly controlled to prevent defects such as porosity, incomplete fusion and cracks, and the welding strength is not lower than that of the base material.

After welding, non-destructive testing including radiographic testing and ultrasonic testing is carried out to check potential hazards of welding seams and tank structure, ensuring the tightness and structural safety of the tank body. Next, anti-corrosion and thermal insulation treatment is performed. According to service environment requirements, technologies such as painting, anti-corrosion coating and thermal insulation layer laying are applied to further improve the tank’s corrosion resistance and aging resistance for adaptation to various indoor and outdoor working conditions. Finally, overall assembly, hydrostatic test and air tightness test are completed. Only vertical storage tanks that meet all design requirements and industrial standards can be delivered to customers.

We always take raw material selection and processing as the priority of production. Strict control over every link of raw material processing and manufacturing guarantees the high quality and long service life of vertical storage tanks, providing safe, reliable and efficient storage solutions for industrial users.