When the flange connection is in use, its main characteristics are convenient disassembly, high strength, and good sealing performance. During the installation of the flange, it is only necessary to keep the two flanges parallel. The sealing surface of the flange should not be damaged and should be cleaned. Flange gaskets should be selected according to design regulations.
The process flow of flange connection is as follows
, The connection between the flange and the pipeline must meet the following requirements:
1. The center of the pipe and the flange should be on the same horizontal line.
2. The center of the pipeline and the sealing surface of the flange form a 90-degree vertical shape.
3. The positions of the flange bolts on the pipeline should correspond to the same.
Second, the requirements for flange gaskets are as follows:
1. In the same pipeline, the gaskets selected for flanges with the same pressure should be the same, so as to facilitate future exchanges.
2. For pipelines using rubber sheets, rubber gaskets are also selected, such as water pipelines.
3. The selection principle of the gasket is: as close as possible to the small width selection, this is the principle that should be followed to ensure that the gasket will not be crushed.
Third, the connecting flange
1. Check whether the specifications of flanges, bolts and gaskets meet the requirements.
2. The sealing surface should be kept smooth and tidy without burrs.
3. The screw thread of the bolt must be complete without any defects, and the fitting must be natural.
4. The texture of the gasket should be flexible, not easy to age, and the surface should not be damaged, wrinkles, scratches and other defects.
5. Before assembling the flange, clean the flange, remove oil, dust, rust and other debris, and remove the sealing line.
Fourth, assemble the flange
1. The flange sealing surface is perpendicular to the center of the pipe.
2. The bolts of the same specification have the same installation direction.
3. The flange installation position on the branch pipe should be at least 100 mm away from the outer wall of the riser, and the distance from the wall of the building should be at least 200 mm.
4. Do not bury the flange directly in the ground because it is easy to be corroded. If it must be buried in the ground, it must be treated with anti-corrosion.
