Flanges should be inspected regularly

A flange connection means that two pipes, fittings, or equipment are first fixed on a flange plate, a gasket is added between the two flange plates, and bolts are used to fasten them together to complete the connection.

Some pipe fittings and equipment already have their own flanges, which are also flanged connections. Flanges are divided into threaded flanges and welded flanges. It is a disc-shaped part and is the most common in pipeline engineering. Flanges are used in pairs. In pipeline engineering, flanges are mainly used for the connection of pipelines. In the pipelines that need to be connected, various flanges are installed. Wire flanges can be used for low-pressure pipelines, and welded flanges can be used for pressures above 4 kg.

The low-pressure small diameter has a wire flange, and the high-pressure and low-pressure large diameter use welded flanges. The thickness of the flanges and the diameter and number of connecting bolts are different for different pressures. The flange sheet will not produce corrosion, pitting, rust, or wear, and is one of the strongest materials in metal materials for construction. Because stainless steel has good corrosion resistance, it can permanently maintain the engineering integrity of structural components.
Flanges cannot be stored for a long time and should be inspected regularly. The frequently exposed processing surfaces must be kept clean, cleaned of dirt, and neatly stored in a ventilated and dry place indoors. It is strictly forbidden to store them in the open air.

When the flanged ball valve, globe valve, and gate valve are used, they are only fully open or fully closed and are not allowed to be used to adjust the flow, so as to avoid erosion of the sealing surface and accelerated wear. Flanges are easy to obtain, simple to manufacture, low cost, and widely used. However, they have poor rigidity, so they should not be used in chemical process piping systems that require supply and demand, flammability, explosion, and high vacuum, as well as high and extremely hazardous occasions.

The sealing surface types are flat and raised.

The flange structure is simple, small in size, and light in weight; it is tight and reliable. At present, the sealing surface material of the ball valve is widely used plastic, with good sealing performance, and it has also been widely used in vacuum systems; maintenance is convenient, the ball valve structure is simple, and the sealing ring is generally movable. It is more convenient to disassemble and replace; when fully open or fully closed, the sealing surfaces of the ball and the valve seat are isolated from the medium.