What is the bimetallic clad pipe?
The performance of lined high chromium double metal composite pipe is at least 50 times that of ordinary steel pipe. The double metal composite steel pipe has inner lining made of wear resistant cast iron. The product has inner and outer double layers of metal. The inner lining material has good wear resistance and corrosion resistance. The material also has high mechanical strength and high impact resistance. Directly adopts the lost foam compounding process, casting and forming metallurgical compound, which is safe and reliable to use.
Lined with high-chromium bimetal composite straight pipe lined with high-chromium double-metal composite elbow lined with high-chromium bimetal composite tee lined with high-chromium bimetal composite four-way lined with high-chromium bimetal composite multi-pass, Lined with a high-chromium bimetallic composite reducer lined with a high-chromium bimetallic flash buffer.
How to use bimetallic clad pipe?
Because oil and natural gas contains a large amount of corrosive media such as hydrogen sulfide, carbon dioxide and chloride ions, especially the content of corrosive components in the oil and gas medium before pipeline purification in the seabed oil and gas field is high, and some even require heat transfer, and internal corrosion problems are very prominent. The use of stainless steel or corrosion-resistant alloys in large quantities is not economical. Double metal clad pipes are a good choice.
The bimetal clad pipe structure uses a corrosion-resistant alloy tube (stainless steel or corrosion-resistant alloy) as the inner liner (wall thickness 0.5-3mm) to contact the corrosive medium and carbon steel or low-alloy steel as the outer base pipe to withstand the pressure. low. Generally, the double-metal clad pipe contains 316L austenite stainless steel as the inner liner in the case of containing CO2 medium, and 2205 and 2505 duplex stainless steel can be used as the medium containing CO2 + small amount of chloride, when H2S+CO2 is contained. + Chloride, the inner liner should be 028, G3, INCONEL625 and Inconel825 nickel-base or iron-nickel alloy, in order to ensure the corrosion resistance of the pipeline, but also can choose the titanium alloy and other materials with excellent corrosion resistance as lining. The outer layer material is usually API 5L X42, X50, X60, X70, ASTM-A106GB and A335-P22 and other materials, so as to ensure the strength of the pipeline.
Double metal clad pipe can be divided into mechanical composite pipe and metallurgical composite pipe according to the manufacturing process. Foreign countries generally believe that the performance of metallurgical clad pipes is better than that of mechanical composite pipes, but it is also possible to make mechanical clad pipes reach the performance of metallurgical composite pipes through pipe end welding and other methods while maintaining low costs.
The bimetallic clad pipe was put into use abroad in 1991 and its usage increased year by year. The application of bimetallic composite pipes in domestic submarine pipelines has progressed relatively late. The Yacheng 13-4 gas field project is the first time that domestic double metal clad pipes are used in the marine environment. At that time, the material was an API 5LDX65 + S316L bimetal mechanical clad tube, which had a good effect.
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