Processing Machinery
2 views
Cross-linked polyethylene pipe pressure resistance test unqualified
Problem Phenomenon
The pipe ruptures or leaks in the hydraulic test, and the pressure resistance performance is not up to standard.
Unqualified pressure resistance directly threatens the safety of pipe use and is a fatal defect in water supply and gas pipelines.
Cause Analysis
（1）The pipe wall thickness is insufficient or uneven
（2）Material degradation causes the molecular weight to decrease
（3）There are bubbles or impurities in the pipe
（4）The crystallinity is inappropriate and the mechanical properties are poor
（5）The melt plasticization is insufficient and the welding is poor
Solution
（1）Check and adjust the pipe wall thickness to ensure the wall thickness of each part is uniform and up to standard
（2）Control the extrusion temperature within the range of 170-220°C to avoid material degradation
（3）Fully dry the raw material to ensure the raw material is clean
（4）Optimize the cooling conditions to ensure the crystallinity of the cross-linked polyethylene is appropriate
（5）Optimize the screw design to ensure sufficient plasticization
Key Takeaway
Unqualified pressure resistance is caused by insufficient wall thickness, material degradation, or internal defects, and needs to be solved systematically from process and material quality.
Was this helpful?
0 people found this helpful
Thank you for your feedback!