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A steel pipe flange is a method of connecting pipes, valves, pumps and other equipment to form a piping system. It also provides easy access for cleaning, inspection or modification. Flanges are usually welded or screwed. Flanged joints are made by bolting together two flanges with a gasket between them to provide a seal.
Common Flange Types and Characteristics:
1. Blind Flanges
Used for terminating or isolating piping systems, blind flanges are essentially boltable blank discs. When installed properly and combined with the correct gaskets, they can achieve an outstanding seal which is easy to remove when needed.
2. Threaded Flanges
Also known as a screwed flange, this style has a thread inside the flange bore which fits with the matching male thread on the pipe or fitting. The threaded connection means you can avoid welding in many use cases. Simply match the threading to the pipes you wish to connect.
3. Weld Neck Flanges
Like lap joint flanges, weld neck flanges require butt welding for installation. However, their integrity, performance in systems with multiple repeat bends, and the ability to use them in high-pressure and high-temperature systems make them a leading choice for process piping.
As the core component of connecting pipelines and equipment, flanges are widely used in industrial and civil fields that require sealing, pressure bearing or easy disassembly and assembly. The following are its main application scenarios:
Oil and gas transmission pipelines: Butt-welded flanges (Class 300 and above) connect high-pressure oil and gas pipelines to ensure sealing (such as API 6A standard).
Thermal power plants: High-pressure steam pipelines use ring joint (RTJ) flanges with a temperature resistance of ≥540℃ (such as ASTM A105 material).
Steel structures: Flanges splice bridge trusses and building support columns (Q235B flat welding flanges).
Hull pipes: 316 stainless steel flanges resistant to salt spray corrosion are used to connect the ballast water system.
Shandong Ruitong New Materials Co., Ltd. is a leading supplier of steel and other metal products in China. As an ISO9001:2015 certified company, our products comply with ASTM, AISI, BS, DIN, JIS and other standards.
