The pressure level, material, standard, etc. of the flange have different characteristics and characteristics. In use, they are used according to certain principles, ways and methods, and can be produced and processed according to the corresponding standards to ensure good use value and effect in use. The products of forging flange manufacturers are suitable for pipelines with large fluctuations in pressure or temperature or high-temperature, high-pressure and low-temperature pipelines, and are also used in pipelines with expensive, flammable and explosive media.
Butt-welded flanges are not easy to deform, well sealed, widely used, and the nominal pressure PN is about 16MPa. The docking size of the flange changes with the nominal pressure, resulting in the fact that the equal diameter flange often cannot be docked. The actual work such as ordering, manufacturing, storage and transportation, installation, overhaul, maintenance, etc. is very troublesome. The docking size of 1.0MPa is adopted for the MPa flange, and the thickness still adopts the original three specifications, so as to achieve docking. Simplify the size.
Production standards of carbon steel forging flanges:
Because the specific dimensions represented by the nominal diameter of the container cylinder and the nominal diameter of the tube are different, the size of container flanges and tube flanges with the same nominal diameter is also different, and the two cannot be substituted for each other. In addition to flat welding and butt welding flanges, there are also cast steel flanges, cast iron flanges, live sleeve flanges, threaded flanges, etc. Lan refers to a flange with a neck and a round tube transition and a butt-welded flange connected to the tube.
Butt-welded flange is one of the flange pipe fittings, which is widely used and promoted in different fields and industries. The scope of application in use is different, and the environment that needs to be used is also different, and it needs to be used according to certain conditions. Butt welding flanges are suitable for steel pipe connections with a nominal pressure of no more than 2.5MPa, which plays an important role and value in the connection of pipes, but it must be ensured that the nominal pressure is within a certain range in use.
Notes on the use of butt welding flange:
Material calculation and unloading can greatly improve the utilization rate of raw materials and realize one of the important links in the refinement of butt welding flange blanks. Too much raw materials not only cause blank waste, but also aggravate mold cavity wear and energy loss. There are cold rolls and hot rolls. After processing into a circle, process water lines, bolt holes, stops and other processes. This is generally a large flange, which can reach 7 meters at a time. Most of the plate-type flat welding flanges are used, and the connection method is welding. If the production process is divided into segments, it can be made of 12 meters to 15 meters or larger.
This kind of flange has good quality assurance. Because the raw material is the middle plate, the density is good. The welding process at the interface of the rolled flange is the top priority, and X-ray or ultrasonic film detection treatment should be done. If the interface is ready, there will be no problem with the material of the whole flange. Relatively speaking, the price of products with thin thickness, light weight, narrow unilateral side of the product and some sealed grooves is higher, while the price of some thick, heavy and heavy rolled flanges without very cumbersome processing technology is lower. When processing bolt holes. It is not allowed to drill bolt holes into places with welds.
Precautions for coiled carbon steel flange:
Products above 3 meters (inclusive) should pay attention to the transportation matters when signing the contract. However, it must be ensured that the nominal pressure is within a certain range during use. The sealing surface of the docking flange can be made into three types: smooth type, convex and tenon type, and the application amount of smooth type docking welding flange*. It is mostly used in relatively mild media conditions, such as low-pressure non-purified compressed air and low-pressure circulating water. Its advantage is the price ratio. Dock welding flanges are suitable for pipelines with large fluctuations in pressure or temperature or high-temperature, high-pressure and low-temperature pipelines, and are also used for pipelines with expensive, flammable and explosive media. The welding method used when connecting the flange of the docked flange and the pipe is butt welding, and the weld seam is similar to the welding of pipes and pipes. Generally, argon arc welding is used for small pipe diameter, and the cover surface is manually welded, and double-sided welding is used for large pipes.
