What is a flange? What are the categories? How to connect? Let me explain to you

When it comes to Flange, many people feel very unfamiliar. But for those who are engaged in mechanical or engineering installations, they should be very familiar with it. Flange is also called flange plate or flange. Its name is the transliteration of its English flange. It is the part that connects the shaft and the shaft. It is used for the connection between pipes, pipe fittings or equipment, as long as it is in two planes. The connection parts that are bolted and closed at the periphery can be collectively referred to as flanges.

Classification of flanges

1.According to chemical industry standards: integral flange, threaded flange, plate flat welding flange, neck butt welding flange, neck flat welding flange, socket welding flange, butt welding ring loose flange, Flat welding ring loose flange, lining flange cover, flange cover.

2.According to the machinery (JB) industry standard: integral flange, butt welding flange, plate flat welding flange, butt welding ring plate loose flange, flat welding ring plate loose flange, flanging ring plate loose flange Flange, flange cover, etc.

Although there are many types of flanges, each type of flange mainly consists of three parts, first the flange itself, which will be placed on the pipe, and then the gasket that fits between the two flanges, which can Provides a tighter and more effective seal.

Due to the important role and comprehensive performance of flanges in life, they are widely used in chemical, fire, petrochemical and drainage industries.

Although small parts such as flanges are inconspicuous in the entire product, their role is very important.

Flange connection

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.

Post time: Jun-29-2022