Advantage of carbon steel pipe

With the rapid development of coastal petrochemical, electric power industry, the application of fresh seawater replace the increasingly tense as industrial cooling medium, can save a lot of fresh water resources, access to significant economic and social benefits. However, due to seawater corrosion, when the ordinary carbon steel or stainless steel tubes, tube bundles seawater as the cooling medium will produce severe corrosion, significantly reduce the life of the heat exchanger. Thus, not only increases the number of replacement equipment, but also equipment downtime due to equipment failure caused by leaving the too frequent economic decrease. Under normal circumstances, in order to solve this problem, we need to be tube material upgrade, the upgrade material commonly used mainly copper-nickel alloy and titanium tubes. Due to the high production costs of titanium tube leaving the user to accept, copper-nickel alloy may cause corrosion due to serious pollution of seawater and cause failure. Meanwhile, in the coastal and inland production plants in some corrosion conditions are harsh environmental conditions, such as heat transfer equipment through the medium of the higher wet hydrogen sulfide or chlorine ion content of ordinary carbon steel or stainless steel tubes can not meet the same anti- corrosion requirements, but also need to upgrade the pipe by the material, to address this universal problem, it has aroused great attention of customers and design department. For heat exchangers, its development has been largely adopted the performance of new materials. Since many occasions serious corrosion phenomenon, one adopts measures surface corrosion, and second is the choice of new corrosion resistant material. The corrosion current application of new materials mainly metal titanium tube, Hastelloy, super duplex stainless steel, zirconium tubes. These materials have good corrosion resistance, but their common drawback is equipment cost is too high, so that the general business difficult to accept.

    To solve the practical problems, there are business material costs are relatively low carbon steel pipe, stainless steel pipe and corrosion as a base strong performance superior thin-walled titanium pipe compound together being applied heat exchange equipment, research and development has the ideal anti-corrosion effect, the manufacturing costs are relatively low (+20 titanium steel, titanium and titanium tubes is 40% + austenitic stainless steel, titanium tubes is 60%) and using the same performance with titanium tube heat exchanger tube bundle. Compared with ordinary carbon steel pipe, it has the following outstanding advantages:

    (1) The corrosion resistance is superior. In the medium for the offshore seawater heat exchanger tube bundle corrosion resistance of titanium tube that can not be compared to any other pipe, composite pipe is the use of titanium tubes to achieve the advantages of corrosion-resistant, easy to scale, easy to plug, sea easy to attach biological effect.

    (2) Material corrosion reduce the cost of inputs. Composite pipe heat exchanger tubes thin-walled titanium pipe satisfy anti-corrosion requirements and use carbon steel or stainless steel as the strength of the body, reaching the effect of titanium tube heat exchanger, which is much lower than the cost.

    (3) reduce maintenance costs. In the heat transfer area 700m2 meter under the same conditions, a Carbon steel pipe bundle annual maintenance cost of about 40,000 yuan, while the composite tube bundle corrosion maintenance cost is almost zero.

    (4) to extend the service life. Common organic corrosion bundle the general life of 1 to 2 years, while the titanium composite tube bundle life of over 10 years.

    (5) The conservation of freshwater resources to reduce overall energy consumption. Using seawater social and economic benefits significantly higher than fresh water. Because seawater is lower than the ambient temperature 6 ~ 10 , while circulating the water temperature higher than the ambient temperature 3 ~ 5 , the temperature difference between the two integrated over 10 , and the overall costs of circulating water system is much higher than seawater. Also, due to the use of recycled water tubes surface will produce microbial adhesion and fouling, can reduce heat transfer efficiency, while titanium composite pipe can effectively avoid microbial attachment so as to avoid heat transfer efficiency.

    Conservation of freshwater resources is an important direction of development of our country, coastal industrial enterprises should make full use of the sea. The product is in coastal areas under conditions of low equipment cost, using seawater instead of fresh water resources strained as industrial cooling medium to provide a guarantee on the device.