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During the annual inspection of the plastic lining equipment, the materials are first discharged, the equipment is cleaned, and then the electric spark detection is performed. This method is time consuming and laborious, and it is difficult to detect equipment that needs continuous production. Therefore, the PNTC70 anti-corrosion layer computer tester is generally used for testing after production. This testing method does not need to drop materials and cleaning equipment, and can perform online testing on the plastic lining equipment in use. The probe end of the computer tester is inserted into the liquid level, and the other end is externally connected to the computer display. From the display, you can know the new and old level of the lining layer, whether it is about to be damaged, how it has been damaged, and how damaged it is.
First, high temperature resistance, can transport hot water.
The high use temperature of polyethylene (PE) is 60 ℃. The hot water type plastic lining equipment is lined with heat-resistant polyethylene. It has excellent properties such as long-term heat resistance, pressure resistance, abrasion resistance and creep resistance. The use temperature reaches 95. ℃. The inner wall of plastic-lined malleable cast iron pipe is lined with polypropylene plastic, the Vicat softening point reaches 145 ° C, and the service temperature can reach 95 ° C. Silicone rubber seals can withstand temperatures up to 260 ° C. For conveying boiling water above 950 ℃, use stainless steel pipe fittings.
Second, no scale, no tumor, corrosion resistance.
The inner tube in contact with the fluid in the plastic lining equipment is a plastic tube, and the plastic is polyethylene. Ensure that no phase change occurs at normal and moderate temperatures. The zinc layer in the galvanized steel pipe is peeled off, the surface of the iron pipe is rusted, the iron-phagic bacteria grow, scale, and rust water is produced, which not only pollutes the water quality, but also increases the resistance to water flow and reduces the service life. The thickness of the plastic pipe in the plastic lining equipment is 1.5-2.5mm, while the thickness of the galvanized layer of the galvanized steel pipe is only 0.07mm, and the thickness difference is 21.4 and 5.7 times. The corrosion resistance and compactness of the plastic are stronger than that of the galvanized steel pipe. Floor.
Therefore, the plastic-lined equipment and stainless steel-lined composite steel pipe do not need to worry about the scaling of the inner hole due to scale and nodules due to corrosion of the inner wall during use. Plastic-lined malleable iron pipe fittings are lined with polypropylene plastic, and the polypropylene plastics are lined in malleable iron pipe fittings through an injection molding machine. The inner wall is smooth, no scale, no tumor, and corrosion resistant.