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Why Does ERW Steel Pipe Have Long Service Life?
Oct 19, 2020
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Why did you know the high frequency straight seam welded steel pipe (ERW steel pipe) has long service life ?
According to different welding methods, spiral welded steel pipe (SSAW steel pipe) can be divided into arc welded pipe, high frequency or low frequency resistance welded pipe, gas welding pipe, furnace welded pipe, and Bondi pipe, etc. Electric welded steel pipe can be used in oil drilling and mechanical manufacturing industry. Furnace welded pipe can be used in water gas pipe, large diameter straight welded pipe for high pressure oil and gas transmission, spiral welded pipe for oil and gas transportation, pipe pile, pier, etc.
According to the weld shape classification, it can be divided into straight welded pipe (LSAW steel pipe) and spiral welded pipe (SSAW steel pipe). The production process of straight welded pipe (LSAW steel pipe) is simple, the production efficiency is high, the cost is low, and the development is fast. Generally, the strength of spiral welded pipe (SSAW steel pipe) is higher than that of longitudinal welded pipe. It can produce welded pipe with larger diameter by using narrow blank and welded pipe with different pipe diameter from blank with the same width. However, compared with the straight seam pipe with the same length, the weld length increases by 30 ~ 100%.
What’s more, the production speed is low. Therefore, the small diameter welded pipe mostly adopts longitudinal welding, while the large diameter welded pipe mostly adopts spiral welding.
The spiral seam welded steel pipe (SSAW steel pipe) is divided into automatic submerged arc welding steel pipe and high frequency welding steel pipe (ERW steel pipr). The spiral seam automatic submerged arc welding steel pipe (SSAW steel pipe) is divided into class a pipe and class B pipe according to the pressure of transmission medium. Class A pipe is generally welded with ordinary carbon steel Q235, Q235F and ordinary low alloy structural steel 16Mn, while class B pipe is welded with Q235, Q235F, Q195 and other steels for low pressure fluid transportation. spiral seam high-frequency welded steel pipe (SSAW steel pipe) has no unified product standard, and is generally made of ordinary carbon steel Q235, Q235F and other steels.
According to the use classification, it can be divided into general welded pipe, galvanized welded pipe, oxygen blown welded pipe, wire sleeve, metric welded pipe, idler pipe, deep well pump pipe, automobile pipe, transformer pipe, electric welding thin wall pipe, electric welding special-shaped pipe and spiral welded pipe. According to different welding methods, spiral welded steel pipe (SSAW steel pipe) can be divided into arc welded pipe, high-frequency or low-frequency resistance welded pipe, gas welded pipe and furnace welded pipe.
Generally speaking, it is expected that in the short term, there will be no corrosion of oil and gas pipelines after 20 years of service with epoxy coal tar pitch plus cathode. After the completion of construction, improper maintenance usually causes the thick cement mortar layer to harden and shrink and produce cracks.
The cost of electro galvanizing is low. The surface is not very smooth, and its corrosion resistance is much worse than that of hot-dip galvanized pipe. In order to enhance the binding force between the mortar layer and the pipe wall, improve the overall mechanical performance of the lining layer and prevent falling, the high-frequency straight seam welded steel pipe (ERW steel pipe) is applied to the pipeline with additional steel wire mesh, and spot welding with short steel bars to make the mesh and pipe wall firmly adhere. In practice, the binding force between the lining layer and the pipe wall is indeed enhanced, because its support and stability to the mortar layer is obvious. In the destructive treatment test, the adhesive force is obviously improved compared with that without net hanging, and it is more difficult to destroy with steel chisel, which has made great progress in the stability of thicker lining layer. However, compared with the conventional internal coating construction, the construction technology of cement mortar lining with hanging mesh needs to be discussed. The high frequency straight seam welded steel pipe can be used as anticorrosion and thermal treatment for the outer wall of underground oil pipeline. It can also be used as anti-corrosion topcoat for sewage treatment tank, water storage tank, coal mine shaft derrick, etc.
In the painting of pipeline outer wall, it is used in combination with glass fiber cloth binding to become a reinforced or extra strengthened coating with excellent anti-corrosion performance. High frequency straight seam welded steel pipe (ERW steel pipe) has hollow cross-section, which is widely used for conveying fluid, such as oil, natural gas, gas, water and some solid materials, and so on, which then has a longer service life.That's why the ERW steel pipe has long service life.
According to different welding methods, spiral welded steel pipe (SSAW steel pipe) can be divided into arc welded pipe, high frequency or low frequency resistance welded pipe, gas welding pipe, furnace welded pipe, and Bondi pipe, etc. Electric welded steel pipe can be used in oil drilling and mechanical manufacturing industry. Furnace welded pipe can be used in water gas pipe, large diameter straight welded pipe for high pressure oil and gas transmission, spiral welded pipe for oil and gas transportation, pipe pile, pier, etc.According to the weld shape classification, it can be divided into straight welded pipe (LSAW steel pipe) and spiral welded pipe (SSAW steel pipe). The production process of straight welded pipe (LSAW steel pipe) is simple, the production efficiency is high, the cost is low, and the development is fast. Generally, the strength of spiral welded pipe (SSAW steel pipe) is higher than that of longitudinal welded pipe. It can produce welded pipe with larger diameter by using narrow blank and welded pipe with different pipe diameter from blank with the same width. However, compared with the straight seam pipe with the same length, the weld length increases by 30 ~ 100%.
What’s more, the production speed is low. Therefore, the small diameter welded pipe mostly adopts longitudinal welding, while the large diameter welded pipe mostly adopts spiral welding.
The spiral seam welded steel pipe (SSAW steel pipe) is divided into automatic submerged arc welding steel pipe and high frequency welding steel pipe (ERW steel pipr). The spiral seam automatic submerged arc welding steel pipe (SSAW steel pipe) is divided into class a pipe and class B pipe according to the pressure of transmission medium. Class A pipe is generally welded with ordinary carbon steel Q235, Q235F and ordinary low alloy structural steel 16Mn, while class B pipe is welded with Q235, Q235F, Q195 and other steels for low pressure fluid transportation. spiral seam high-frequency welded steel pipe (SSAW steel pipe) has no unified product standard, and is generally made of ordinary carbon steel Q235, Q235F and other steels.
According to the use classification, it can be divided into general welded pipe, galvanized welded pipe, oxygen blown welded pipe, wire sleeve, metric welded pipe, idler pipe, deep well pump pipe, automobile pipe, transformer pipe, electric welding thin wall pipe, electric welding special-shaped pipe and spiral welded pipe. According to different welding methods, spiral welded steel pipe (SSAW steel pipe) can be divided into arc welded pipe, high-frequency or low-frequency resistance welded pipe, gas welded pipe and furnace welded pipe.
Generally speaking, it is expected that in the short term, there will be no corrosion of oil and gas pipelines after 20 years of service with epoxy coal tar pitch plus cathode. After the completion of construction, improper maintenance usually causes the thick cement mortar layer to harden and shrink and produce cracks.
The cost of electro galvanizing is low. The surface is not very smooth, and its corrosion resistance is much worse than that of hot-dip galvanized pipe. In order to enhance the binding force between the mortar layer and the pipe wall, improve the overall mechanical performance of the lining layer and prevent falling, the high-frequency straight seam welded steel pipe (ERW steel pipe) is applied to the pipeline with additional steel wire mesh, and spot welding with short steel bars to make the mesh and pipe wall firmly adhere. In practice, the binding force between the lining layer and the pipe wall is indeed enhanced, because its support and stability to the mortar layer is obvious. In the destructive treatment test, the adhesive force is obviously improved compared with that without net hanging, and it is more difficult to destroy with steel chisel, which has made great progress in the stability of thicker lining layer. However, compared with the conventional internal coating construction, the construction technology of cement mortar lining with hanging mesh needs to be discussed. The high frequency straight seam welded steel pipe can be used as anticorrosion and thermal treatment for the outer wall of underground oil pipeline. It can also be used as anti-corrosion topcoat for sewage treatment tank, water storage tank, coal mine shaft derrick, etc.
In the painting of pipeline outer wall, it is used in combination with glass fiber cloth binding to become a reinforced or extra strengthened coating with excellent anti-corrosion performance. High frequency straight seam welded steel pipe (ERW steel pipe) has hollow cross-section, which is widely used for conveying fluid, such as oil, natural gas, gas, water and some solid materials, and so on, which then has a longer service life.That's why the ERW steel pipe has long service life.
