Railway duct is a very common ventilation and exhaust pipe infrastructure, which can effectively circulate air and reduce the concentration of harmful gases. Therefore, the material of main products such as iron pipes, sheets and profiles is very strict. The following is a detailed description of the production requirements of iron pipes by Co., Ltd.
1. Weld appearance inspection, no air hole, trachoma, slag inclusion, cracks and other defects, correct the deformation of steel plate after welding;
2. The insulation layer of iron plate air duct is made of polystyrene foam board. The density of the foam board is 40 nanometer structure /m3, the thickness is 35 nanometer structure (the surface temperature should not be lower than 5 degrees Celsius). The edge of the insulation layer adopts trapezoidal or tenon groove structure, and is made of resin paste.
3. Connect the air duct and tuyere of the iron plate air duct with the hose with insulation layer;
4. 铁管的管道应平整、笔直。主风管小于或等于1.5 mm，但小于或等于1 mm;
4. Pipes of iron pipes should be flat and straight. The main duct is less than or equal to 1.5 mm, but less than or equal to 1 mm.
5. The surface of the iron plate air duct and accessories is flat, the arc is uniform, the longitudinal joint should be staggered, the occlusion joint should be tight and the width should be uniform.
6. 制造铁管及配件，外径或外径允许偏差小于或等于300mm为- 1mm;-2mm大于300mm。风管系统中所有直角弯头均安装在消声器弯头内，消声器弯头内安装镀锌铁板导向器;
6. Making iron pipes and fittings, the allowable deviation of outer diameter or outer diameter less than or equal to 300 mm is - 1 mm; - 2 mm is more than 300 mm. All right-angle elbows in the air duct system are installed in the muffler elbow, and galvanized iron plate guide is installed in the muffler elbow.
7. The air duct of the iron plate air duct adopts mechanical bite, neat and rigorous, and the inner surface of the interface adopts glass glue.