- In petrochemical production, especially in propylene production and processing, friction, deformation and wear or heat are often caused due to excessive temperature. Specifically, radial cracks, that is, thermal cracks, will occur on the surface of the sealing ring under the condition of large thermal stress.
- This kind of thermal cracking generally occurs in a short period of time under the action of mechanical stress or thermal load, and the thermal cracking will aggravate the wear of the sealing ring and even increase the leakage. For hot cracking, it is generally caused by dry friction, blockage of the cooling system, or sudden mid-section, uneven or excessive specific pressure on the end face.
- In the actual production process, due to the failure of the water circulation system in the chemical plant, the flushing flow was insufficient, which caused the overheating failure of the sealing friction pair of the water ring compressor sealant.
- When the friction pair is made of resin-impregnated graphite ring material, once the end face is overheated and the temperature exceeds the standard temperature, the resin may be separated from the graphite ring, and its wear resistance will decrease. In the oxidizing medium, once the temperature exceeds the oxidized end face, the graphite ring will The ring may chemically react with the oxide, release carbon monoxide gas, make the end face rougher, and then reduce its wear resistance, eventually causing the seal to fail.