Wenzhou flange manufacturer shares what types of flanges there are.

Release time:

2020-05-03

In the 21st century, flanges have become one of the key components in the chemical industry, oil refining, and pressure vessel fields. Flanges come in different materials; one type is made from solid-forged material, typically using grades 304, 316, or 316L, while the other type has a relatively rougher surface texture. So how are flanges classified? Let’s hear from a flange cap manufacturer in Wenzhou. The classification of flanges is primarily based on the connection method between the flange and the pipe, and can be specifically divided into the following types:

　　In the 21st century, flanges have become one of the key components in the chemical industry, oil refining, and pressure vessel applications. Flanges come in different materials; one type is made from solid-forged material, using grades such as 304, 316, or 316L, while the other type features a relatively rougher surface texture. So how are flanges classified? Wenzhou flange manufacturer Let me share this with you. Flange classifications are primarily based on the connection method between the flange and the pipe, and can be specifically divided into the following types:

　　1. Integral flange.

　　These flanges are primarily used for the inlet and outlet connections of pumps, valves, and other mechanical equipment. Typically, these inlet and outlet flanges are manufactured as part of the equipment’s housing, forming an integral component of the device. Flanges are usually cast together with the equipment’s housing; only a small number are forged flanges (such as the end flanges on forged steel valves).

　　2. Spiral flange.

　　The inner bore of the flange is machined with pipe threads and paired with a helical pipe to achieve network connectivity—this is known as a non-welded flange. Compared to welded flanges, threaded flanges are easier to install and maintain, making them suitable for pipelines where welding is not permitted on-site. Wenzhou flange manufacturer Tip: Steel flanges are sufficiently robust, but they can be difficult to weld—or if welded poorly. In such cases, threaded flanges can also be used.

　　3. Relative welding flange.

　　Also known as a high-neck flange, this type of flange differs from other flanges in that it features a long, tapered high neck that is welded between the flange and the pipe. The wall thickness of the high-neck section gradually varies along its height, transitioning smoothly to the wall thickness of the pipe itself. This design helps mitigate stress discontinuities and thereby enhances the flange’s strength. Welding-neck flanges are primarily used in harsh operating conditions. Wenzhou flange manufacturer For example: Flanges experience high stress or cyclically varying stress due to thermal expansion of pipelines or other loads; pipelines operating under conditions of high pressure and temperature fluctuations, or exposed to high, elevated, or low temperatures.

　　4. Flat-welded flange

　　Also known as lap-welded flanges, these flanges are connected to pipes by first inserting the inner bore of the pipe flange into the appropriate position and then welding it in place. The advantage of this type of joint is that it’s easy to align during welding assembly and has low costs, which is why it’s widely used.

　　5. Socket-welded flange

　　The basic shape is identical to that of a flat-welded flange with a neck. The inner bore of the flange features a bearing hole. A pipe insert is welded into the bearing hole. A circular weld seam is welded onto the back side of the flange. Wenzhou flange manufacturer Reminder: Due to the gap between the flange and the pipe, corrosion can sometimes occur easily. However, if the internal area is welded, corrosion can be avoided.