Stainless Steel Slip on Flanges (SO Flanges) are widely-used, cost-effective flange components designed for low to medium pressure pipeline connections. Characterized by a simple slip-on structure, they are engineered with a focus on easy installation, reliable sealing, and good adaptability, making them suitable for various industrial and civil pipeline systems, such as water supply and drainage, HVAC, chemical auxiliary pipelines, and light industrial equipment connections.
The flange body is made of high-quality stainless steel, with common grades including 304, 316, and 316L to adapt to different working environments. 304 stainless steel is the most widely applied option, featuring excellent rust resistance and mechanical strength, suitable for pipelines transporting non-corrosive or weakly corrosive media like water, compressed air, and common solvents. 316 and 316L stainless steel have enhanced corrosion resistance, capable of withstanding weak acids, alkalis, and seawater erosion, making them ideal for harsh scenarios such as coastal projects and light chemical plants. All materials comply with international standards, ensuring long-term stable use without rust, deformation, or sealing failure.
A key structural feature of these flanges is their slip-on design: the flange has a circular hole slightly larger than the pipeline outer diameter, allowing it to be directly slipped onto the pipeline end. The flange disc is equipped with evenly distributed bolt holes, and the sealing surface is precision machined to be smooth and flat, ensuring tight fitting with gaskets (commonly rubber, PTFE, or asbestos gaskets) to achieve reliable sealing. The flange diameter ranges from DN15 to DN600, and the thickness varies from 6mm to 20mm, which can be customized according to actual pipeline specifications and pressure requirements.
In terms of processing technology, the flanges undergo precision forging, cutting, and polishing procedures to ensure structural integrity and surface flatness. The inner hole and sealing surface are finely processed to avoid burrs, ensuring smooth slipping onto the pipeline and tight sealing. The surface is treated with pickling and passivation, which not only improves the appearance but also enhances corrosion resistance and prevents media accumulation. The connection method is simple: slip the flange onto the pipeline end, fix it with bolts after alignment, and the gasket between the flange and pipeline ensures tight sealing, reducing installation difficulty and labor costs.
Regarding performance parameters, the maximum pressure-bearing capacity of stainless steel slip on flanges can reach PN16, and the applicable temperature range is from -20℃ to 180℃, fully meeting the requirements of most low to medium pressure pipeline systems. They are lightweight, easy to transport and store, and the slip-on design facilitates quick installation and later maintenance, making them a cost-effective choice for large-scale pipeline laying projects.
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