Stainless Steel Blind Flanges, also known as blank flanges, are specialized flange components designed to seal the end of pipelines or equipment openings. They are engineered with a focus on tight sealing, corrosion resistance, and easy installation, making them suitable for various industrial pipeline systems that require temporary or permanent isolation of media, such as oil, chemical, water treatment, and power industries.
The flange body is made of high-quality stainless steel, with common grades including 304, 316, and 316L to adapt to different working conditions. 304 stainless steel is widely used for general industrial scenarios, featuring excellent rust resistance and mechanical strength, suitable for sealing pipelines transporting non-corrosive or weakly corrosive media. 316 and 316L stainless steel have enhanced corrosion resistance, capable of withstanding erosion from strong acids, alkalis, seawater, and chemical reagents, making them ideal for harsh environments like chemical plants and offshore projects. All materials comply with international standards, ensuring long-term stable performance without rust, deformation, or leakage.
A key structural feature of these flanges is their solid disc design, which has no central hole, distinguishing them from other flange types. The sealing surface is precision machined to be smooth and flat, ensuring tight fitting with gaskets (commonly rubber, PTFE, or metal gaskets) to achieve reliable sealing and prevent media leakage. The disc thickness ranges from 8mm to 25mm, and the diameter varies from DN15 to DN600, which can be customized according to actual pipeline specifications. Evenly distributed bolt holes around the disc are processed by precision drilling, ensuring accurate positioning and smooth installation with matching flanges or pipeline ends.
In terms of processing technology, the flanges undergo precision forging, cutting, and polishing procedures to ensure structural integrity and surface flatness. The surface is treated with pickling and passivation, resulting in a smooth, burr-free finish that not only improves appearance but also enhances corrosion resistance and prevents media adhesion. The connection method is simple: the blind flange is aligned with the pipeline end or matching flange, fixed with bolts, and the gasket between them ensures tight sealing, no complex welding operations are required, facilitating later disassembly and maintenance.
Regarding performance parameters, the maximum pressure-bearing capacity of stainless steel blind flanges can reach PN16, and the applicable temperature range is from -20℃ to 200℃, fully meeting the sealing requirements of most industrial low to medium pressure pipeline systems. The solid structure ensures good pressure resistance and impact resistance, while the stainless steel material guarantees long service life, reducing maintenance frequency and long-term use costs for users.
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