Manufacturer of anti-corrosion steel pipes lined with cement mortar for sewage discharge

Description :

　　The application of cement mortar lining in water transmission steel pipes: 1. It has good chemical corrosion resistance; 2. Good insulation performance and compactness to prevent corrosion caused by electrochemical and stray currents; 3. 4. It is resistant to bacterial corrosion and has a certain mechanical strength to prevent mechanical damage during transportation and burial; 5. Easy and safe construction, meeting on-site construction requirements, etc. In addition, there are some special requirements in special areas, such as cold resistance. Anti corrosion and rust removal process of cement mortar lining: Advantages of cement mortar anti-corrosion steel pipes: (1) Anti corrosion performance: Cement mortar lining isolates the inner wall of the steel pipe from water or air, forming a dense protective layer, thereby inhibiting oxidation and corrosion scaling of the inner wall of the steel pipe. Compared to other anti-corrosion coatings.

　　The reasons for the adhesive force between the cement mortar and the inner wall of the steel pipe are: the hydration of A cement particles forms a gel, which produces adhesive force on the inner wall of the steel pipe; When the cement mortar hardens, its volume shrinks and it tightly adheres to the inner wall of the steel pipe, generating friction; The inner wall of the C steel pipe is uneven, and the mechanical interlocking effect between it and the cement mortar forms a squeezing force. The presence of the above three forces, coupled with a similar coefficient of thermal expansion, ensures a tight bond between the cement mortar and the inner wall of the steel pipe, making it less likely to peel off. Cement mortar lining will produce cracks in the early stage of construction, mainly due to the volume shrinkage of cement mortar when it hardens in the air. By adding additives and increasing the temperature and humidity during the curing period, the occurrence of cracks can be effectively reduced. In addition, the final contraction period of cement mortar is about 1-2 years. After the steel pipe is put into operation, the cement mortar continues to harden in water for a long time, which can automatically close the cracks without affecting the anti-corrosion effect.

　　(2) Hydraulic conditions: After actual observation, the cement mortar lining is flat and uniform, covering all the unevenness and welds on the inner wall of the steel pipe. The surface of cement mortar lining can form a layer of slippery material containing manganese, thereby reducing frictional resistance. Its roughness coefficient is about 0.012, and it tends to decrease with the extension of service life. The roughness coefficient of steel pipes and cast iron pipes is 0. Therefore, cement mortar lining is conducive to improving the conveying capacity of steel pipes. From a technical perspective, the first half of this week's trading session reached a critical point, but whether a new pattern can emerge remains to be further confirmed. At that time, it was not far from the general direction, and the establishment of a truly prosperous market was not yet ready. But from Thursday night trading, it seems that the overall direction has gradually become clear, and the bullish atmosphere in the market is beginning to grow. The channel for long-term oscillation is opening up. But from this wave of market trends, it appears that the market is moving too quickly, with no buffer zone in the middle, but rather a bullish candlestick rising straight into the sky. This has caused some doubts or panic in the market, leading to less firm long positions and temporary lack of opportunities for short positions. From the perspective of the operating trajectory, due to the unstable pace of this market trend, there is a high possibility of recurrence. It is possible that as the market continues to rise, a major bearish candlestick may appear and pull to the bottom. At this point, the market's confidence will become more firm after repeated bottoming out, and the upward path will become clearer. But at this point, it seems that the situation is exactly the opposite. Therefore, there is a significant risk brewing in the upward channel! In addition, the deep discount situation has never been broken, and as we enter the rainy season in the south at the end of May, the real estate and manufacturing industries are sluggish, and the overall market still relies on infrastructure projects to drive. Therefore, fundamentally speaking, there is also a need for a further consolidation process. Next week, there is still a possibility for the market to rise. But for those who are long, they still need to do a good job of risk control, control their positions, set stop losses, and prevent "washout" during the trading session. There is still a chance to go short, but when the upward momentum is not enough to support sustained gains, there may be a surge and a pullback, which is also a good time to buy.

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• Cement mortar anti-corrosion steel pipe