Manufacturing process and installation standards for lined pipes
Thread Content
Dear Haihao friends, what are the manufacturing processes and installation standards for lined pipes?
The original poster, take a look at this; it might be a bit helpful to you. The manufacturing processes include molding, loose lining, and so on
HG/T 20538-2016 \"Series for the Selection of Plastic-Lined Steel Pipes and Fittings\" HGT 2437-2006 \"Plastic Lining for Steel Pipes and Fittings\" ASTM F1545 \"Standard Specification for Plastic-Lined Ferrous Metal Pipe, Fittings, and Flanges\"
You can refer to the answer above for installation standards; the specific standards can be found online by looking up relevant manuals
The academic name for steel-lined plastic composite pipes is steel-polyolefin (PO) pipes. These pipes are made by combining a steel core with plastic (POPE) using scientific methods, thereby granting them both the mechanical properties of steel pipes and the anti-corrosion, wear-resistant, and scale-resistant characteristics of specialty plastics. They represent an ideal choice for transporting corrosive media at present. I. Steel-lined plastic composite pipes: The main production process for steel-lined polyolefin (PO) pipes; Schematic diagram of the plastic-lining pipe production process: Raw materials → Cutting and material extraction → Trimming → Straightening and alignment → Welding → Grinding and rust removal → Sending to the furnace → Automatic heating → Intelligent material transfer → Rotational rotational molding → Returning to the furnace for leveling → Surface finishing → Quality inspection → Painting → Marking → Packaging → External inspection → Storage.
II. 1. Production of shell semi-finished products: In accordance with the company’s production and procurement plans, various raw materials that meet the requirements are purchased. After chemical testing, the materials are cut to the specified dimensions using specialized cutting machines for metal pipes. The initially cut pieces are then trimmed using CNC lathes; once the dimensions are verified to be correct, flange spot welding is carried out using precision flange control devices on both straight pipes and fitting straightening and alignment machines. Finally, the semi-finished shells are welded together using automatic submerged arc welding or gas shielded welding, depending on the specifications. 2. Grinding and rust removal: The shell semi-finished products that have passed the inspection are subjected to rust removal on their inner and outer surfaces using a straight-pressure open-type sandblaster, with the rust removal level reaching Sa3. Subsequently, the inner surface of these semi-finished products is gently ground so that the inner wall of the steel tube becomes frosted in appearance; this helps to enhance the adhesion and density between the plastic and the steel tube during the rotational molding process. It also helps to remove any remaining weld slag, iron shavings, and rust, thereby ensuring the quality of the product in the subsequent rotational molding steps. 3. Heating rotational molding: The pre-treated shell semi-finished products are fed into automated heating furnaces according to different specifications and models for heating. An intelligent electronic temperature controller is used to regulate the heating process, ensuring that the shells are thoroughly heated. Once the temperature controller indicates that the shells have reached the desired temperature, an intelligent feeding controller and an automatic dosing mechanism are used to feed the specified amount of powder into the inner wall of the steel tube, where the automatic lining process is completed within a rotating device. 4. Leveling and finishing: The product obtained after the first step of rotational molding is transferred to another automated heating furnace with a relatively lower set temperature. A rotating device is used to slowly turn the product inside the furnace, thereby causing the thermoplastic powder that remains adhered to the inner surface of the steel tube to melt further. After gradual cooling, the product is taken out of the furnace, and its outer surface is shaped to give it an attractive appearance. 5. Painting and packaging: The already rotational-molded finished products are subjected to various specified type tests. Those that pass the inspections are treated with three coats of paint – primer, intermediate coat, and topcoat – and are labeled and packaged in accordance with standards (the paint, labeling, and packaging can also be arranged according to the customer’s requirements). Henan Kaishen Pipe Industry Co., Ltd., located in the Luoyang Industrial Park, is a diversified and high-tech enterprise that integrates research and development, production, and sales. The company is committed to the development, research, and application of environmentally friendly and energy-saving new products, and specializes in the production of wear-resistant and corrosion-resistant pipes and equipment. The products include anti-corrosion and wear-resistant series such as ultra-high molecular weight polyethylene series, rubber-lined series, and plastic-lined series. The company also possesses capabilities in engineering surveying, design, production, and installation, as well as a comprehensive after-sales service system. The plastic-lined steel pipe series is one of the new products developed by the company. This series includes steel-lined (rolled) pipes, steel-lined (rolled) PO pipes, steel-lined PP pipes, steel-lined PVC pipes, steel-lined polytetrafluoroethylene pipes, as well as various custom-made and complete sets of plastic-lining equipment.
II. 1. Production of shell semi-finished products: In accordance with the company’s production and procurement plans, various raw materials that meet the requirements are purchased. After chemical testing, the materials are cut to the specified dimensions using specialized cutting machines for metal pipes. The initially cut pieces are then trimmed using CNC lathes; once the dimensions are verified to be correct, flange spot welding is carried out using precision flange control devices on both straight pipes and fitting straightening and alignment machines. Finally, the semi-finished shells are welded together using automatic submerged arc welding or gas shielded welding, depending on the specifications. 2. Grinding and rust removal: The shell semi-finished products that have passed the inspection are subjected to rust removal on their inner and outer surfaces using a straight-pressure open-type sandblaster, with the rust removal level reaching Sa3. Subsequently, the inner surface of these semi-finished products is gently ground so that the inner wall of the steel tube becomes frosted in appearance; this helps to enhance the adhesion and density between the plastic and the steel tube during the rotational molding process. It also helps to remove any remaining weld slag, iron shavings, and rust, thereby ensuring the quality of the product in the subsequent rotational molding steps. 3. Heating rotational molding: The pre-treated shell semi-finished products are fed into automated heating furnaces according to different specifications and models for heating. An intelligent electronic temperature controller is used to regulate the heating process, ensuring that the shells are thoroughly heated. Once the temperature controller indicates that the shells have reached the desired temperature, an intelligent feeding controller and an automatic dosing mechanism are used to feed the specified amount of powder into the inner wall of the steel tube, where the automatic lining process is completed within a rotating device. 4. Leveling and finishing: The product obtained after the first step of rotational molding is transferred to another automated heating furnace with a relatively lower set temperature. A rotating device is used to slowly turn the product inside the furnace, thereby causing the thermoplastic powder that remains adhered to the inner surface of the steel tube to melt further. After gradual cooling, the product is taken out of the furnace, and its outer surface is shaped to give it an attractive appearance. 5. Painting and packaging: The already rotational-molded finished products are subjected to various specified type tests. Those that pass the inspections are treated with three coats of paint – primer, intermediate coat, and topcoat – and are labeled and packaged in accordance with standards (the paint, labeling, and packaging can also be arranged according to the customer’s requirements). Henan Kaishen Pipe Industry Co., Ltd., located in the Luoyang Industrial Park, is a diversified and high-tech enterprise that integrates research and development, production, and sales. The company is committed to the development, research, and application of environmentally friendly and energy-saving new products, and specializes in the production of wear-resistant and corrosion-resistant pipes and equipment. The products include anti-corrosion and wear-resistant series such as ultra-high molecular weight polyethylene series, rubber-lined series, and plastic-lined series. The company also possesses capabilities in engineering surveying, design, production, and installation, as well as a comprehensive after-sales service system. The plastic-lined steel pipe series is one of the new products developed by the company. This series includes steel-lined (rolled) pipes, steel-lined (rolled) PO pipes, steel-lined PP pipes, steel-lined PVC pipes, steel-lined polytetrafluoroethylene pipes, as well as various custom-made and complete sets of plastic-lining equipment.