Processing Machinery
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Linear low-density polyethylene pipe failing pressure test (variant: strengthened measures)
Problem Phenomenon
The pipe ruptures or leaks in the hydraulic test, and pressure resistance does not meet standards.
Failing the pressure test directly threatens the safety of pipe use and is a fatal defect in water supply and gas pipelines.
Especially, additional attention is needed on top of the original basis; this problem is more prominent and requires focused attention.
Cause Analysis
(1) Pipe wall thickness is insufficient or uneven
(2) Material degradation causes molecular weight reduction
(3) There are bubbles or impurities inside the pipe
(4) Inappropriate crystallinity results in poor mechanical properties
(5) Insufficient melt plasticization results in poor welding
(6) On top of the original basis, additional attention is needed as process parameter fluctuations or equipment condition changes aggravate this problem
Solution
(1) Check and adjust pipe wall thickness to ensure uniform wall thickness at all parts meets standards
(2) Control extrusion temperature within the 190-250°C range to avoid material degradation
(3) Fully dry the raw material to ensure it is clean
(4) Optimize cooling conditions to ensure appropriate crystallinity of linear low-density polyethylene
(5) Optimize screw design to ensure full plasticization
(6) And strengthen process monitoring; on top of the original basis, additional attention is needed to pay special attention to parameter stability
Key Takeaway
Pressure test failure is caused by insufficient wall thickness, material degradation or internal defects and needs to be systematically solved from process and material quality.
In different production scenarios, targeted preventive measures need to be taken.
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