English
Pressure vessels and LPG cylinders require strict surface treatment before use to ensure the adhesion and service life of anti-corrosion coatings. Shot blasting is the most widely used surface cleaning process in this field, efficiently removing mill scale, rust, and welding residues from the cylinder surface, providing an ideal surface foundation for subsequent coating.
During the manufacturing process of LPG cylinders, pressure vessels, fire extinguisher bottles, and industrial gas cylinders, surfaces develop mill scale, welding slag, and rolling scales. These contaminants must be thoroughly removed before coating, otherwise they will cause blistering and peeling of the coating, shortening the product service life. Shot blasting is an indispensable process before cylinder coating.
Removal of Mill Scale
The mill scale layer formed during hot rolling and welding of cylinders is dense, brittle, and has weak adhesion to the base material. Shot blasting uses high-speed abrasive impact to completely remove the mill scale layer.
Removal of Welding Slag
Welded cylinders have welding slag and spatter at the weld seam. Shot blasting effectively removes these residues, leaving the weld smooth and flat.
Improvement of Coating Adhesion
After shot blasting, the cylinder surface develops a uniform roughness, increasing the contact area between the coating and the base material, significantly enhancing adhesion and extending corrosion protection life.
Stress Relief
The impact of shot blasting creates compressive stress on the cylinder surface layer, helping to relieve residual stress generated during welding and forming processes.
Surface treatment for LPG cylinders and pressure vessels has strict standard requirements:
Cleanliness
After treatment, the surface cleanliness must reach Sa2.5, with no visible mill scale, rust, or welding slag.
Roughness
Surface roughness must be moderate, ensuring coating adhesion without excessive paint consumption.
No Residue
After treatment, the surface must be free of dust, oil, or other contaminants to ensure defect-free coating.
After shot blasting, cylinders and pressure vessels achieve a surface cleanliness of Sa2.5, displaying a uniform metallic luster. The surface roughness is moderate, providing an excellent adhesion base for anti-corrosion coatings. The cleaned products can proceed directly to the painting process.
Zhiling Machinery provides customized shot blasting solutions for the pressure vessel and LPG cylinder industry. Hanging chain shot blasting machines can be configured with chain speed, blast wheel arrangement, and chamber dimensions based on cylinder specifications and production requirements. The equipment features wear-resistant liners, high-efficiency dust collection systems, and PLC intelligent control to ensure long-term stable operation. We have supplied equipment to numerous cylinder manufacturing enterprises both domestically and internationally.
Different pressure vessels, cylinders, and tubular products require different shot blasting solutions depending on their dimensions, production volume, and surface treatment requirements.
For LPG cylinders, fire extinguisher bottles, industrial gas cylinders, and similar products, a liquefied gas cylinder shot blasting machine is specifically designed to provide complete surface cleaning before coating. The equipment ensures uniform treatment of the entire cylinder surface while maintaining high production efficiency.
For pressure vessel components, steel pipes, tubular sections, and other cylindrical workpieces, a dedicated pipe shot blasting machine can effectively remove mill scale, rust, and welding residues from the outer surface. This solution is suitable for manufacturers handling a variety of cylindrical products with different diameters and lengths.
For production environments requiring continuous material flow and integration with downstream coating operations, pass-through shot blasting systems can be incorporated into automated manufacturing lines. These systems help improve throughput and reduce manual handling while maintaining consistent cleaning quality.
The most suitable solution depends on workpiece dimensions, production capacity, coating specifications, and automation requirements. Zhiling Machinery can customize equipment configurations to meet the needs of cylinder manufacturers, pressure vessel fabricators, and industrial equipment producers.
