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Relationship between Aging Wear and Corrosion of Mechanical Seal of Glass-lined Reactor

We understand the in-depth understanding of the mechanical seal for the glass-lined reactor in the production process, to bring the company the greatest use of benefits. Prolong service life, reduce failure rate, and increase production output.

     The corrosion resistance of the auxiliary seal ring of the glass-lined reactor mechanical seal differs depending on the type of corrosion rubber. Due to the corrosion and aging of the rubber, the rubber that has failed is corroded and the surface becomes rough and loses its elasticity and is easily broken. The oil resistance of rubber differs depending on the type. The rubber that is not resistant to oil swells, the friction increases, and the floatability is not good, making the seal ineffective. Rubber and F4 have poor temperature resistance, and silicone rubber has the best temperature resistance and can be used at 200°C. Corrosion of the contact area with the auxiliary seal ring, mechanical seal ring, sleeve, static ring, static ring seat, and there is no large relative movement with the rubber or F4 auxiliary seal contact, the liquid is relatively static and easy to form a dead angle, give The metal bushings, moving rings, static seats, and seals that come into contact cause special corrosion, including crevice corrosion, frictional corrosion, and contact corrosion. Three kinds of corrosion exist at the same time and alternately, so the corrosion surface is wider and deep. Observing that the depth of the surface is 1-1.5 times the diameter of the sealing ring, the leakage of the seal is serious if the etching degree is not less than 0.01 mm. Contact corrosion media, and the metal itself is not resistant to corrosion, it will produce surface corrosion, the phenomenon of leakage, early wear, damage, sound and so on. The metal surface is uniformly eroded by two forms of film formation and no film. The corrosion of the filmless metal is very dangerous, and the corrosion process proceeds at a certain speed. This is mainly due to errors in material selection. The corrosion of the film, the passivation film usually has the protective effect, but the material used in the metal seal ring, such as stainless steel, cobalt, chromium alloy, etc., on the surface of the passivation film damage in the end surface friction, in the absence of oxygen under the new film It is difficult to generate and increase galvanic corrosion. The main forms of failure of mechanical seals for tanks are failure due to corrosion, heat damage, wear, and installation and operation. After the disintegration of the mechanical seal of the kettle, there is no scratch and abrasion on the sealing surface, so the reason for the physical damage of the sealing surface can be excluded. Considering that there are many crystallized materials and scales in the sealed cavity, combined with many performances of mechanical seal failure, the primary reason for the seal failure is to determine the easy crystallization and corrosion properties of the transported medium. Changing the structure of the elastic element The mechanical seal of the kettle changes the elastic element from spring to bellows. The bellows is both an elastic element and an auxiliary seal of the moving ring. The o-ring between the moving ring and the shaft sleeve is omitted and only the moving ring is required. At the end of the seat, a seal is used to seal the material at the place. This not only solves the contradiction between the sealing and compensation of the O-ring, but also changes the original quasi-static seal to a completely static seal, which improves the reliability of the seal. The use of bellows also eliminates the mechanical pin seal of the spring mechanical seal and the mating surface between the moving ring and the moving ring seat, avoiding the malfunction of the moving ring caused by the deposition of solid particles, and further improving the overall performance of the mechanical seal. . Bellows provide both elastic compensation and torque, with better followability and compensation. The static ring compensation replaces the dynamic ring compensation: the mechanical seal of the kettle mechanical seal has a large mass of the moving ring portion in the mechanical seal assembly than the stationary ring portion, so the rotational momentum is also large during operation. Instead of the static-ring compensation, the rotational momentum is reduced, which improves the stability and reliability of the entire mechanical seal assembly. Increase the gap between the ring and the sleeve: increasing the gap can avoid the deposition of crystals and scales, and increase the inner diameter of the ring or reduce the inner diameter of the sleeve under the premise of ensuring the end face pressure ratio. According to relevant data recommendations, the gap was increased from the original 0.38mm to 0.5mm. Appropriately increase the punching line diameter: In view of the fact that there are many crystallized materials and scales, the increase in flushing volume of mechanical seals in tanks can effectively resolve the deposition of solid particles. Therefore, the aperture of the original flushing line must be increased from 12.7 mm to 19.05 mm. . However, it should be noted that increasing the pore size too much reduces the efficiency of the pump. Increase the mesh number of the inlet filter: Increasing the number of meshes of the filter can effectively prevent the solid particles from entering the sealed cavity and provide a more ideal working environment for the mechanical seal.



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