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The Performance Comparison between Steel Pipes and FRP Pipes-Part 1
Aug 26, 2021
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The performance of steel pipes:
1. Compared with the materials of other traditional pipes, the material of steel pipes is light with high strength and good toughness. It can bear higher internal pressure. It also can adapt to the complex or harsh geological environment.
2. However, there is a large rate of occurrences of problems with steel pipes in the process of usage. The main trouble is the internal and external anti-corrosion treatment. First, the problem of external corrosion is very critical. The quality of external corrosion directly affects its service life.
Now, the method of external corrosion of domestic steel pipes is mainly the cover type approach. The external corrosion of steel pipes is all required to be enhanced or specially enhanced. There are some areas to implement cathodic protection. The cover type methods of external anticorrosive methods are generally the coatings such as petroleum asphalts and epoxy coal asphalts. The latter is not easy to cure at low temperature, and there are more problems in the field of welding construction. This chlorosulfonated polyethylene was originally used. However, most of the solvents are easy to produce pinholes. Moreover, the fight against wear is not up to standard. It is no longer clearly used in some parts of the regions.
For cathodic protection, its anticorrosion effect is better. However, the method of sacrificing anode is adopted. The anode must be replaced regularly in the future operation, which increases the operation cost and work. As for the treatment of inner walls, there are three ways in common: mortar of antiseptic coatings, resins and cements. There are two problems with the three methods: the first problem is the bonding strength of the anticorrosive layers and steel pipes. Regrading to the anticorrosive coating and resin mortar, they require complete rust removal of the inner surface of the steel pipe to construction, but this is difficult. Therefore, the rust point part causes the origin of later layered stripping, forming corrosion and scaling.
The second one is that the vast majority of steel pipes are on-site welding construction after welding anticorrosion. It can only be done manually. The quality is not easy to control. Moreover, as for the pipes with smaller diameters, it is no longer anticorrosive because the personnel cannot enter the construction. It will also cause the hidden danger of welding damage in the future. According to the analysis of several pipe burst accidents of steel pipes, it is mainly caused by the weld corrosion with low weld quality.
3. The overall cost is high.
4. Poor hydraulic performance and high-energy consumption. The roughness coefficient of the steel pipe is between 0.013-0.014. Thus, the resistance along the pipeline is high for the pipeline with the same water quantity and the same pipe diameter. Then, it is necessary to increase the head of the pump and increase the initial investment. At the same time, the operation cost will increase greatly due to the large power consumption.
5. The bearing capacity of pipes on water hammer is poor.
The performance of FRP pipes:
1. The corrosion resistance is good and there is no effect on water quality. FRP pipes are resistant to the erosion of acid, alkali, salt, seawater, untreated sewage, corrosive soil or groundwater, and numerous chemical fluids. It has a longer service life than that of traditional pipes. Its design service life is generally more than 50 years. For sand reinforced plastic pipes, more applications are in the municipal, urban transmissions and distribution pipe networks. It has many advantages. It is non-toxic, no rust, tasteless, no secondary pollution to water quality and no need for corrosion. What's more, the service life can be greatly extended and the installation is easy. Therefore, the water supply and drainage industry are very welcomed by the users.
2. Anti-fouling and anti-moth.
The surface of unsaturated polyester resin is clean and smooth. It will not be polluted by shellfishes, fungus and other germs in the sea or the polluted water so that the roughness increases, the water-crossing section is reduced and the maintenance cost increases. There is no pollution from FRP pipes. It can keep as clear as before after long-term use. At the same time, due to its smooth inner wall and excellent corrosion resistance, it will not produce scales and the breeding of microorganisms, effectively ensuring water quality and maintaining the stability of water resistance. However, the water resistance and surface scaling of traditional pipes will have great possibility of increase in the future.
3. Good heat resistance and frost resistance.
The FRP pipe still has good toughness and extremely high strength at 30 ℃. It can be used in the long term between 50 ℃ to 80 ℃. It can even be used and work above 110 ℃ in the use of special formula resins.
1. Compared with the materials of other traditional pipes, the material of steel pipes is light with high strength and good toughness. It can bear higher internal pressure. It also can adapt to the complex or harsh geological environment.
2. However, there is a large rate of occurrences of problems with steel pipes in the process of usage. The main trouble is the internal and external anti-corrosion treatment. First, the problem of external corrosion is very critical. The quality of external corrosion directly affects its service life.
Now, the method of external corrosion of domestic steel pipes is mainly the cover type approach. The external corrosion of steel pipes is all required to be enhanced or specially enhanced. There are some areas to implement cathodic protection. The cover type methods of external anticorrosive methods are generally the coatings such as petroleum asphalts and epoxy coal asphalts. The latter is not easy to cure at low temperature, and there are more problems in the field of welding construction. This chlorosulfonated polyethylene was originally used. However, most of the solvents are easy to produce pinholes. Moreover, the fight against wear is not up to standard. It is no longer clearly used in some parts of the regions.
For cathodic protection, its anticorrosion effect is better. However, the method of sacrificing anode is adopted. The anode must be replaced regularly in the future operation, which increases the operation cost and work. As for the treatment of inner walls, there are three ways in common: mortar of antiseptic coatings, resins and cements. There are two problems with the three methods: the first problem is the bonding strength of the anticorrosive layers and steel pipes. Regrading to the anticorrosive coating and resin mortar, they require complete rust removal of the inner surface of the steel pipe to construction, but this is difficult. Therefore, the rust point part causes the origin of later layered stripping, forming corrosion and scaling.
The second one is that the vast majority of steel pipes are on-site welding construction after welding anticorrosion. It can only be done manually. The quality is not easy to control. Moreover, as for the pipes with smaller diameters, it is no longer anticorrosive because the personnel cannot enter the construction. It will also cause the hidden danger of welding damage in the future. According to the analysis of several pipe burst accidents of steel pipes, it is mainly caused by the weld corrosion with low weld quality.
3. The overall cost is high.
4. Poor hydraulic performance and high-energy consumption. The roughness coefficient of the steel pipe is between 0.013-0.014. Thus, the resistance along the pipeline is high for the pipeline with the same water quantity and the same pipe diameter. Then, it is necessary to increase the head of the pump and increase the initial investment. At the same time, the operation cost will increase greatly due to the large power consumption.
5. The bearing capacity of pipes on water hammer is poor.
The performance of FRP pipes:
1. The corrosion resistance is good and there is no effect on water quality. FRP pipes are resistant to the erosion of acid, alkali, salt, seawater, untreated sewage, corrosive soil or groundwater, and numerous chemical fluids. It has a longer service life than that of traditional pipes. Its design service life is generally more than 50 years. For sand reinforced plastic pipes, more applications are in the municipal, urban transmissions and distribution pipe networks. It has many advantages. It is non-toxic, no rust, tasteless, no secondary pollution to water quality and no need for corrosion. What's more, the service life can be greatly extended and the installation is easy. Therefore, the water supply and drainage industry are very welcomed by the users.
2. Anti-fouling and anti-moth.
The surface of unsaturated polyester resin is clean and smooth. It will not be polluted by shellfishes, fungus and other germs in the sea or the polluted water so that the roughness increases, the water-crossing section is reduced and the maintenance cost increases. There is no pollution from FRP pipes. It can keep as clear as before after long-term use. At the same time, due to its smooth inner wall and excellent corrosion resistance, it will not produce scales and the breeding of microorganisms, effectively ensuring water quality and maintaining the stability of water resistance. However, the water resistance and surface scaling of traditional pipes will have great possibility of increase in the future.
3. Good heat resistance and frost resistance.
The FRP pipe still has good toughness and extremely high strength at 30 ℃. It can be used in the long term between 50 ℃ to 80 ℃. It can even be used and work above 110 ℃ in the use of special formula resins.
