Consumption control of polyethylene material in 3PE application of steel pipe

In order to decrease the consumption control of raw materials in 3PE coating application of steel pipe and based on the experiences in 3PE coating application of steel pipe, the thickness distribution of 3PE coating is analyzed. The results show that the main factor affecting the consumption of polyethylene material is the uneven thickness of 3PE coating. Common situations in 3PE coating application are as follows: (1) the thickness of polyethylene coating at overlap position is higher than that of the pipe body, and (2) the thickness of polyethylene coating at welding joints is lower than that of the pipe body. The main methods to decrease the consumption of polyethylene material are introduced, including reducing overlap width, adjusting heating temperature and pressure of roller, increasing coating thickness at welding joints and reducing the reject ratio of pipes.