Connection Of Forged Flange

1. The flange connection should be kept on the same axis, the center deviation of the bolt hole should not exceed 5% of the hole diameter, and the bolt should be perforated freely. The connecting bolts of the flange should have the same specifications, the installation direction should be the same, and the bolts should be tightened symmetrically and evenly.

2. Diagonal washers of different thicknesses should not be used to compensate for the non-parallelism of the flanges. Do not use double washers. When the large diameter gasket needs to be spliced, it should not be butted with the flat port, but should be in the form of a diagonal lap or labyrinth.

3. In order to facilitate the installation and disassembly of the flange, the fastening bolts and the flange surface shall not be less than 200 mm.

4. When tightening the bolts, it should be symmetrical and intersecting to ensure uniform stress on the washer.

5. Bolts and nuts should be coated with molybdenum disulfide, graphite oil or graphite powder for subsequent removal: stainless steel, alloy steel bolts and nuts; piping design temperature below 100°C or 0°C; open air facilities; atmospheric corrosion or corrosive media .

6. Metal washers such as copper, aluminum and mild steel should be annealed before installation.

7. It is not allowed to directly bury the flange connection. Flange connections of buried pipelines shall have inspection wells. If it must be buried, anti-corrosion measures should be taken.