What Factors Affect the Performance of PE100 Water Supply Pipes?

The core factors affecting the performance of HDPE Water Supply Pipes (PE Pipe for Water Supply)can be divided into four categories: raw material properties, production processes, construction and installation conditions, and operating environments, detailed as follows:

PE100 is a grade designation for polyethylene resin dedicated to pipe manufacturing, with a Minimum Required Strength (MRS) of 10.0 MPa. Insufficient raw material purity, incorporation of recycled materials, or failure to meet the grade standard will directly reduce the pipe's pressure resistance, creep resistance, and Environmental Stress Crack Resistance (ESCR).

The types and dosages of additives such as antioxidants, light stabilizers, and ultraviolet absorbers affect the pipe's aging resistance (especially for outdoor applications), corrosion resistance, and service life. For instance, an inadequate amount of antioxidants will cause the pipe to undergo oxidative degradation under high temperatures or long-term pressure.

The coordination of extrusion temperature, screw speed, and traction speed determines the pipe's wall thickness uniformity, dimensional deviation, and internal structural compactness. Uneven wall thickness leads to local stress concentration, which is prone to pipe bursting; excessively high extrusion temperature will cause resin degradation and reduce mechanical properties.

Excessively fast or uneven cooling speed will generate residual stress inside the pipe, affecting its ring stiffness and impact resistance; insufficient cooling will cause pipe deformation and poor dimensional stability.

The quality of butt fusion welding or electrofusion welding between pipes and fittings directly affects the system's tightness and pressure resistance. Improper control of welding temperature, time, and pressure will result in incomplete fusion or false welding, leading to water leakage or bursting at the joints.

For direct burial laying, backfill containing sharp stones or hard objects will scratch the pipe's outer wall and form stress concentration points; insufficient compaction of backfill will cause pipe deformation under external loads. For overhead laying, excessively large support spacing or improper fixing methods will lead to pipe sagging and local stress overload.

Exposure of pipes to direct sunlight or rolling during construction, or the presence of impurities and moisture at joints, will damage the pipe structure and joint tightness. When constructing in low-temperature environments, the toughness of PE100 pipes will decrease, making them susceptible to brittle cracking.

Water containing corrosive ions (e.g., chloride ions), acids, alkalis, or impurity particles will accelerate the wear or aging of the pipe's inner wall; excessively high medium temperature (exceeding the design temperature of PE100 pipes（PE water pipe）, typically ≤40℃) will significantly reduce the pipe's pressure resistance and creep resistance.

Long-term exposure to over-limit internal pressure (exceeding the pipe's nominal pressure) or external loads (e.g., vehicle rolling, soil settlement) will cause plastic deformation or bursting of the pipe; frequent pressure fluctuations in the water supply system will exacerbate fatigue damage to the pipe.

Pipes exposed outdoors will be affected by ultraviolet radiation, temperature alternations, and humidity changes, accelerating oxidative degradation; microorganisms or chemical substances in the soil may also cause environmental stress cracking of the pipe.