Pressure Test and Water Tightness Test for Polyethylene Pipes

Section 1: Pressure Test

During pressure testing, the PE pipe should be securely fastened in place. The flange connection should be exposed for inspection of any leaks. The test pressure for pressure testing should not exceed 1.5 times the pressure rating of the pipe material or the component with the lowest pressure rating in the system. Initially, the pressure should be raised to the specified test pressure and held for a sufficient duration to ensure the pipe fully expands. Once the system stabilizes, increase the pressure to 1.5 times the working pressure, maintain it for 1 hour, closely observe the pressure gauge, and inspect along the pipeline.

Section II: Watertightness Test

Polyethylene (PE) pipes offer superior water-tightness compared to traditional piping materials. The test pressure for water-tightness tests should not exceed 1.5 times the pressure rating of the piping components or the lowest pressure rating in the system. After the pipeline pressure reaches the test pressure, it should be maintained for a certain period to ensure that the temperature of the test medium inside the pipeline is consistent with the ambient temperature of the pipeline. Once the temperature and pressure are stable, timing begins. Generally, water-tightness tests should be conducted at a constant pressure for 24 hours. Upon completion, if there are no obvious leaks or pressure drops, the test is considered passed.