Circulating water pipeline loose-fitting limit compensation joint type and specification
The heat treatment of circulating water pipeline loose set limit compensation joint is generally accepted as solution heat treatment, or "annealing", the temperature range of the process is 1040~1120℃. The circulating water pipeline loose-fitting compensating joint can also be inspected in the annealing furnace inspection hole, and the circulating water pipeline loose-fitting compensating joint in the annealing zone should be in incandescent form, and no softening sagging phenomenon. In the unloading strain can automatically recover the phenomenon. That is, in the pipeline state, due to the action of the applied stress, resulting in stress-induced martensitic phase change occurs.
The standard of loose set limit expansion joint is GB/T12465-2007 pipeline loose set compensation joint. Before processing the joint, we should plan the circulating water pipeline loose set limit compensation joint to see how to use the circulating water pipeline loose set limit compensation joint to reduce the use of waste. The planned joint should be cut into blocks by professionals, and the curtain should be wound and circulating water pipeline loose set limit compensation joint pressed in layers. Carbon black and vulcanizing agent are applied to the mold for high temperature vulcanization molding, which becomes our circulating water pipeline loose sleeve limit compensation joint.
The models of limit loose sleeve pipeline compensation joint are: VSSJA-2 and B2F, VSSJA-2 is the factory standard model and B2F is the model in the national standard. The method of inspection will be wiped in the annealing furnace at each joint gap, observe whether there is air leakage, which is more likely to leak is the annealing furnace in and out of the tube place, where the seal is very easy to wear, need to check and replace frequently. To avoid air leakage, the maintenance gas in the bright furnace should be maintained at a certain positive air pressure, and if the maintenance gas is hydrogen, it should generally reach more than 20kBar.
All circulating water pipeline loose-fitting limit compensation joints are subject to surface treatment. The iron oxide on the inner and outer surfaces should be sprayed out by shot blasting treatment and then coated with anti-corrosion paint. This is necessary for export. In addition, we do this in order to facilitate transportation and prevent corrosion and oxidation of circulating water pipeline loose set limit compensation joints.
The cold resistance of circulating water pipeline loose set limit compensation joint can be as low as -60℃ to -80℃ and the heat resistance can be as high as +180℃ to +350℃. Due to the small hysteresis loss, circulating water pipeline loose set limit compensating joints can also withstand various bending and flexural deformations. The third feature of circulating water pipeline loose set limit compensation joint seal is that it can be used, mixed and compounded with various materials, thus modified to obtain good comprehensive performance.
