Non-standard flanges, also known as sealing and fastening connections, are disc-shaped components commonly used in pipeline engineering. Flanges are always used in pairs. In pipeline engineering, flanges are primarily used for pipe connections.法兰 disks are installed in various ways on the pipes to be connected. Soldered flanges can be used for low-pressure pipelines, while welded flanges are required for pressures above 4 kg. A sealing point is added between the two flanges, and then secured with bolts. Flanges with different pressure ratings naturally have different thicknesses, and the bolts used are also varied. The components of these devices are also made in corresponding flange shapes, known as flange joints. They are widely used in large containers in industries such as aerospace, oil, and petrochemicals.