Steel-reinforced plastic pipeThe connection method is identical to that of hot-dipped galvanized pipes. Threads are cut at both ends of the pipes, and the connecting fittings are made of Ma steel pipes with an inner composite plastic layer and zinc coating. Sealant is applied at the joints and threads during connection. For large-diameter pipes, couplings or flanges are used for connection. The connection method for steel-plastic composite pressure pipes is similar to that of aluminum-plastic pipes. These pipes can be bent at small angles in one direction, so no fittings are needed for small-angle turns. For large-angle turns, mechanical expansion and flanging are used, and the connecting fittings are internally sealed.