The effect of using mortar for anti-corrosion in water supply pipes

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This post was last edited by Wang Wei2 on 2024-11-18 at 10:16. There are already industry standards in China regarding the use of mortar as a lining for buried water supply pipes; for example, the \"Technical Standards for Cement Mortar Lining of Buried Water Supply Pipes\" issued by the China Engineering Construction Standard Association. Standards previously issued by the Ministry of Petroleum Industry, such as the \"Design Code for Anti-corrosion Engineering of Steel Pipelines and Storage Tanks\", etc. There are design specifications and acceptance criteria for mortar linings. In recent years, cement mortar lining has been used as a protective layer on the inner walls of many buried water supply pipelines in China, achieving good results. Such as the 14.5-kilometer-long (Φ2500) water conveyance pipeline installed in the Tianjin Yinluan Project. The 3.3-kilometer-long water conveyance pipeline (Φ2400-Φ3000) installed for the upstream water diversion project of the Huangpu River in Shanghai. The first phase of Beijing Water Source No. 9 Plant features 54 kilometers of water transmission pipelines (Φ2200) and 29 kilometers of water distribution pipelines (Φ1000-Φ2200). The 11-kilometer-long water supply pipes (Φ700-Φ1600) laid by Nanjing Water Supply Company, and the 25-kilometer-long water supply pipeline (Φ1400) installed as part of the Dalian Bi Shui Project. The 27-kilometer water supply pipeline from Longhupao to the water purification plant (Φ1600) owned by Daqing Petroleum and Natural Gas Corporation, etc. Therefore, using a mortar lining for the anti-corrosion protection of the inner wall of water supply pipes is a method with good overall benefits, and it is the preferred approach for such anti-corrosion protection. Anticorrosion effect of mortar: Most of the buried water supply pipes in oil refineries are over 20 years old, and their inner walls are protected with mortar for anticorrosion purposes. Due to corrosion on the outer wall of the pipes, some of them need to be replaced. Upon inspection of the old pipes that were removed, it was found that the mortar used for protection had good anti-corrosion properties; the mortar layer on the inner surface was hard and smooth, with no signs of bulging or peeling. Conclusion: The advantages of using mortar as an anti-corrosion lining for the inner wall of buried pipes are as follows: (1) It requires minimal treatment of the metal surface, making it easy to ensure the quality of the surface preparation. (2) The mortar lining is simple to construct, easy to master, efficient, and ensures high construction quality; it is also non-toxic and harmless. (3) Low unit cost and long service life. Therefore, this method is the preferred approach for anti-corrosion treatment of the inner walls of buried water supply pipes, and its overall benefits are unmatched by other methods.