Common problems in casting flange use
During flange casting, liquid metal is filled into the mold and solidified during rotation.Flange casting has the following characteristics: liquid metal can form a mold with a freely selected hollow cylinder surface, so that the hollow casting does not have a core, thus greatly simplifying the production and management of sleeves, pipes, and casting process, with high production efficiency and low cost.
Due to the flange’s influence on force, improved filling conditions, gas and nonmetallic inclusions easily exit liquid or metal, and flange’s compact structure, defects such as shrinkage holes, air holes, and inclusions, better mechanical properties.These eliminate or greatly save the metal consumption of pouring and riser, realizing high utilization rate of metal equipment. Due to the flange force generated by the liquid on the metal under different rotation modes, the flange casting technology can improve the metal filling ability. Therefore, the flange casting method can be used to produce alloys and thin-walled castings with poor social mobility.
If the flange leakage cannot be dealt with in time, the leakage will rapidly expand under the erosion of the medium, causing material loss, destroying the production environment, causing the company to stop production, and causing huge economic losses. If the major accident is the leakage of toxic, flammable and explosive media, it can also cause poisoning, fire or explosion. In modern industry, corrosion media, temperature, pressure, vibration and other factors can inevitably lead to flange leakage. Due to dimensional error of the sealing surface, aging of sealing elements, improper installation and tightening, flange leakage is easy to occur.
In some traditional enterprises, the way to solve the flange leakage is to replace the sealing element and apply the sealant, or to replace the flange and the pipeline. However, the research of this method has great limitations. Some leaks are restricted by the safety of work and living environment, which eliminates hidden safety hazards and saves more maintenance costs for enterprises. We can now use polymer compound plugging solution, which is a very ideal method, especially in flammable and explosive environment also shows its unique advantages. Polymer composite technology has the advantages of simple construction process, safety and low cost.
The same is true for large flange connections. The real meaning of using flanges is that they have good sealing performance, and can effectively make sure whether the entire pipeline is smooth and sealed. It can not only enhance the efficient sealing performance of the pipeline, but also facilitate effective disassembly, secondary use and cleaning. Of course, flanges are an unusual product. Flanges are divided into different pressure levels, different pressures in pipelines, matching equipment or containers, and matching materials and pipeline joints. Flanges are indispensable accessories in engineering and play an unusual role.