Processing Machinery
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Cross-linked polyethylene pipe pressure resistance test failure (Variant: strengthened measures)
Problem Phenomenon
The pipe ruptures or leaks in the hydraulic test, and the pressure resistance does not meet the standard.
Failure of pressure resistance directly threatens the safety of pipe use and is a fatal defect in water supply and gas pipelines.
Especially on the original basis, additional attention is needed, and this problem is more prominent and requires key attention.
Cause Analysis
(1) Pipe wall thickness insufficient or uneven
(2) Material degradation causes molecular weight reduction
(3) Bubbles or impurities in the pipe
(4) Unsuitable crystallinity, poor mechanical properties
(5) Melt plasticization insufficient, poor welding
(6) On the original basis, additional attention is needed: process parameter fluctuations or equipment state changes aggravate this problem
Solution
(1) Check and adjust pipe wall thickness to ensure uniform wall thickness at all parts meets the standard
(2) Control extrusion temperature within 170-220°C to avoid material degradation
(3) Fully dry raw materials, ensure raw materials are clean
(4) Optimize cooling conditions to ensure suitable cross-linked polyethylene crystallinity
(5) Optimize screw design to ensure full plasticization
(6) And strengthen process monitoring; on the original basis, additional attention is needed, paying special attention to parameter stability
Key Takeaway
Pressure resistance failure is caused by insufficient wall thickness, material degradation or internal defects, and needs to be systematically solved from process and material quality.
Targeted preventive measures need to be taken in different production scenarios.
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