1. Compared with other conventional pipes, the supply of
seamless steel pipes is lighter in raw materials, high in strength, well tolerated, able to withstand high internal pressures, sensitive to production, and can be used in messy or harsh geological conditions.
2. However, there is a large tip rate during the operation of the steel pipe, which is mainly the trouble of internal and external corrosion treatment. The main problem of external corrosion is very important, and its external corrosion quality directly affects its service life. The main external steel pipe corrosion is now a concealed method, which requires strengthening or particularly strengthening external corrosion of the steel pipe, and promotes cathodic protection in some areas. The method of externally etching the concealed type is usually lacquer such as petroleum pitch, epoxy coal tar pitch, which is not easily curable at lower temperatures, and more problems during on-site welding construction, initially using chlorosulfonated poly. Ethylene, because of most of the solvents, is easy to pinhole and resist breakdown failure and is no longer clear in some areas. Cathodic protection has good anti-corrosion effect, but due to the selection method of sacrificial anodes, anodes must be periodically replaced during operation to increase operating costs and operations.
In addition to the inner wall treatment, the supply of seamless steel tubes usually uses three methods: anti-corrosion coatings, resin mortars, and cement mortars. There are two problems with the three methods: First, the cohesive strength of the coating and the steel bar. The foregoing is cement mortar. The two methods of anti-corrosion coating and resin mortar require that the appearance of the steel pipe be completed with anti-rust construction, but it is difficult to do without. Therefore, the formation of rust layer is the root cause of exfoliation corrosion and dirt in each layer in the future; the second is the majority of steel pipe welding construction site, corrosion after welding. Can only be performed manually. The quality is not easy to control, and, on pipelines with smaller diameters, because workers cannot enter the construction, it is no longer corrosion. In the future, it will also pose a hidden danger to the weld. According to the analysis of several pipe explosion accidents, the main type is the corrosion of the type weld with low weld quality.
3, the supply of seamless steel tubes is at a high cost.
4, poor hydraulic performance, high energy consumption. In the 0.013-0.014 tube pipe roughness coefficient, so in the same amount of water, the diameter of the pipeline, the resistance along it, the demand of the pump head is increasing, more and more upfront investment and operating costs, due to the power consumption also Greatly increased, but.
5, water hammer has the disadvantage of poor carrying capacity.
