Ceramic-lined composite steel pipe
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Ceramic-lined composite steel pipes are used in fine slag pumping systems, and such pipes are required to have excellent wear and corrosion resistance. The technical requirements are as follows: 1. They must meet the standard specifications for ceramic-lined composite steel pipes specified in YB/T176-2017. 2. The specifications for the ceramic-lined composite pipe are 168*20; this means using a 20# seamless steel pipe with dimensions of 168*12, with an 8mm thick ceramic lining applied to its interior. 3. The ceramic is a monolithic ceramic, manufactured using the thermal diffusion centrifugation process; its hardness is ≥1000 HV, density is ≥3.4 g.cm-3, and compressive strength is ≥280 MPa. 4. Ceramic-lined composite pipes are welded at both ends with necked flanges of DN150, 600LB, and RF type; each straight section of the composite pipe is 3 meters long, giving a total length of 300 meters ； The interior of the flange also requires a ceramic lining. 5. The ceramic-lined composite pipe is equipped with 6 90° elbows of R1000, 2 45° inclined tees of DN150/DN50, and flanges identical to those of the straight pipes at both ends (the interior of all these components must be fully lined with ceramic). 6. The mating flanges for ceramic-lined composite pipes must be equipped with sufficient bolts and gaskets (metal-wound gaskets), with a 10% excess amount. 7. The pipes are equipped with T-type pipe supports of appropriate size; each straight pipe and elbow is fitted with at least 3 pipe supports, and each support comes with a rubber pad and bolts. 8. The inner surface of the ceramic-lined composite pipe should be flat, smooth, and free from peeling; the outer surface requires anti-corrosion treatment, with a gray anti-corrosion coating applied to it.
The applicable standards and specifications for wear-resistant ceramic composite elbows are listed below (including but not limited to; for standards without a specified date, their latest versions apply to this project): (1) YB176 \"YB/T176-2000 Ceramic-Lined Composite Steel Pipes\", (2) DLT \"680-2015 Technical Requirements for Wear-Resistant Pipes in the Power Industry\", (3) G8163 \"GB/T 8163-2008 Seamless Steel Pipes for Transporting Fluids\"
Wear-resistant ceramic backpacks and wear-resistant elbows are generally used in coal powder transmission systems and dust removal systems in industries such as thermal power, steel, chemicals, smelting, and cement. Product features: Double-layer ultra-wear resistance: The wear-resistant ceramic elbow for backpacks features a double-layer anti-wear design; it is made from high-quality alumina corundum ceramic with a hardness of over HRA85, offering more than 10 times greater wear resistance compared to ordinary pipes ； High temperature resistance, corrosion resistance, and oxidation resistance: The wear-resistant elbows produced by the manufacturers in Liaocheng are capable of operating at temperatures up to 350°C for extended periods of time, and they resist acid and alkali corrosion as well as oxidation ； Seismic resistance and thermal expansion/contraction: The thermal expansion coefficient of adhesives lies between that of steel and ceramics, allowing them to effectively compensate for the stress on ceramics resulting from the different rates of thermal expansion between ceramics and steel ； Multiple flexible fibers are added to the adhesive to ensure that the ceramic does not fall off during long-term operation in environments subject to vibration and frequent thermal expansion and contraction ； Anti-scouring: Capable of withstanding the scouring by larger particles without breaking ； Lubrication of inner and outer walls ensures smooth air flow and prevents scaling: The smooth surface allows materials to pass through easily, without any sticking or blockages ； Simple device: 1/3 lighter than regular pipes, allows for easy transfer, saves labor; the device is simpler and more agile, enabling pipes to be installed at greater heights with ease ； Low cost: Reduces the load on support and hanger equipment, saving material costs ； Reduced maintenance: Its wear resistance **decreases the frequency of repairs**, saving costs and labor
Welding work? Should it still be combined with adhesive?
How are steel pipes connected, and how is corrosion resistance at the connection points ensured?