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Flanges come in various types and are used for connecting pipes, valves, equipment, and other fittings in industrial and construction fields. There are numerous types of flanges, and here are some common types:
1. Classification by connection method:
– Forged flanges: Made from forged steel and typically used in high-pressure and high-temperature conditions.
– Cast flanges: Made from cast iron or cast steel materials and widely used in general industrial and construction sectors.
– Threaded flanges: Connected through threaded joints and suitable for low-pressure and small-diameter pipe connections.
– Weld neck flanges: Connected through welding and commonly used in high-pressure, high-temperature, and special medium pipe systems.
2. Classification by structural form:
– Flat flanges: Have flat sealing surfaces and are suitable for most applications in pipe systems.
– Raised face flanges: Raised sealing surfaces and are suitable for high-pressure and high-temperature pipe systems.
– Machined flanges: Have machined sealing surfaces, offering high connection precision and sealing performance.
– Ring flanges: These have ring-shaped sealing surfaces and are used for specific pipe connection requirements.
3. Classification by standards:
– ANSI flanges: Conform to the standards set by the American National Standards Institute (ANSI) and are commonly used in the North American market.
– DIN flanges: Conform to the standards set by the Deutsches Institut für Normung (DIN) and are commonly used in the European market.
– JIS flanges: Conform to the standards set by the Japanese Industrial Standards (JIS) and are commonly used in the Japanese market.
– BS flanges: Conform to the standards set by the British Standards (BS) and are commonly used in the UK and some other countries.
4. Other special types:
– Manifold flanges: Used for connecting pipes and valves, commonly found in the petroleum and chemical industries.
– Blind flanges: Used for sealing off pipe ends or valves, typically without a center opening.
– Stainless steel flanges: Flanges made from stainless steel material, known for their corrosion resistance and suitability for special mediums and environments.
The above are just some common types of flanges, and there are many other types and standards available to meet different engineering requirements. Choosing the appropriate flange type requires considering factors such as working conditions, medium characteristics, and installation requirements of the pipe system.