HDPE (High-Density Polyethylene) water supply pipes may leak during use. Depending on the severity of the leakage, appropriate repair methods can be selected. The following provides a detailed introduction:
Repair Materials and Tools：HDPE repair rods, hot air guns, sandpaper, and cleaning cloths.
Repair Steps
Cut the Damaged Pipe Section : Turn off the water supply. Measure and mark the position of the damaged pipe section with a tape measure. Use a pipe cutter to carefully cut off the damaged part. Ensure the cut is flat and perpendicular to the pipe axis during cutting.
Prepare the New Pipe Section : According to the length of the cut - off pipe section, cut a new HDPE pipe section of the same length with a pipe cutter.
Hot - Melt Connection : Pre - heat the hot - melt welding machine to the appropriate temperature (generally, the hot - melt temperature of HDPE pipes is between 200 - 230°C). Heat the connection ends of the new pipe section and the original pipe respectively. The heating time and depth should be determined according to the pipe specification and the instructions of the welding machine. After heating, quickly connect the new pipe section to the original pipe and maintain a certain pressure to ensure full fusion.
Cool and Inspect : Let the connection area cool naturally. Do not move or shake the pipe during this period. After cooling, check if the connection area is firm and well - sealed. Then, turn on the water supply for testing.
Precautions after Repair
Pressure Test : After the repair is completed, a pressure test is an essential step. Generally, the pressure of the pipeline system needs to be increased to 1.5 times the working pressure and maintained for a certain period (usually 30 minutes to 1 hour). Carefully check if there are any leakage phenomena in the repaired area and the entire pipeline system.
Observe the Usage Situation : During subsequent use, closely monitor the repaired area. In the first few days, increase the inspection frequency to check for any signs of leakage or other abnormal situations.
