Production & Quality
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HDPE pipe internal stress cracking
Problem Phenomenon
The pipe develops longitudinal cracks after storage or use for a period of time, especially at cut notches.
Cause Analysis
Too fast cooling causes large temperature differences between the inner and outer pipe walls and inconsistent shrinkage, producing internal stress; uneven sizing cooling also freezes orientation stress, and stress concentration at cut sharp corners induces cracking.
Solution
①Optimize the cooling gradient to avoid quenching; ②ensure uniform spraying; ③make rounded transitions at cut notches; ④anneal the pipe if necessary.; after adjustment, take consecutive samples to verify the effect, and resume mass production only after confirming stability
Key Takeaway
Pipe internal stress cracking has a lag; uniform slow cooling is the fundamental prevention, and notch treatment and annealing can be used as remedial measures.; after confirming effectiveness, fix the parameters and practices into the work instruction to prevent recurrence
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