The pressure test is generally used to judge whether the water pipe connection is reliable. Fill the pipe with water, thoroughly drain the air in the pipe, increase the pressure to the test pressure with a pressurizing pump, and re-pressurize to the test pressure every 10 minutes, repeat twice. Record the last pump pressure 10min and 40min after the pressure, the pressure difference should not be about 0.06MPa. After another 2 hours after the end, the pressure drop should not exceed 0.02MPa. At this time, the ppr piping system can be used for normal water supply.
