1, the supply of
ASTM A53 seamless steel pipe, compared with other traditional pipes, is lighter in raw material, high in strength, good in tolerance, can withstand high internal pressure, is sensitive to production, and can be used in disorderly or abominable geological conditions.
2, however, there is a great final speed in the use of steel pipe, which is difficult to treat inside and outside. The main external corrosion of this problem is very important, and the quality of its external corrosion directly affects its service life. Now the main external steel pipe corrosion is a concealed way to strengthen or enhance external corrosion for steel pipes, and promote cathodic protection in some areas. The external corrosion methods for hidden types are usually coatings, such as petroleum bitumen, epoxy coal tar and so on. It is not easy to cure at low temperature, but more problems in the field welding are used, and Chlorsulfonated polyethylene is used, because most solvents are easy to pinhole and prevent breakdown from breakdown, and some areas are no longer clear. Its cathodic protection has good corrosion protection effect, but because of the choice of sacrificial anode method, it is necessary to replace the anode regularly in the future operation, and increase the operation cost and operation.
Besides the inner wall treatment, there are usually three ways to supply seamless steel tubes: anticorrosive coatings, resin mortar and cement mortar. The three way is two problems: the first is the bond strength between the coating and the steel bar, and the cement mortar has been mentioned before. The two methods of anticorrosive coating and resin mortar require the appearance of steel pipe to complete the construction of rusting, but this is very difficult. So the rusty part will form the future peel layer, peel off the source of corrosion and dirt; two is the vast majority of the steel pipe welding site, after welding after corrosion. It can only be done manually. The quality is not easy to control, and in the case of smaller pipeline, it is no longer corrosive because the staff can not enter the construction. There will be a hidden danger to the weld in the future. According to many pipe bursting accident analysis, it is mainly the type of weld corrosion which is not high quality.
3, the cost of seamless steel pipe supply is high.
4, the hydraulic function is poor and the energy consumption is high. The roughness coefficient of the pipe in the pipe is between 0.013-0.014, so the equal amount of water and the pipe of the equal diameter pipe are higher, the demand of the pump head is increased, the demand for the pump head is increased, and the cost of the pipe is increased in advance. At the same time, the operation cost of the pipe is increased, but it is also greatly increased.
5, there are disadvantages of poor bearing capacity of water hammer pipe.
