Extrusion & Post
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HDPE pipe ovality out of tolerance
Problem Phenomenon
The pipe cross-section is elliptical, affecting welding and laying.
Cause Analysis
Insufficient vacuum sizing, uneven cooling, or mismatch between haul-off speed and extrusion speed; the self-weight sag of large-diameter pipes also aggravates the ovality.
Solution
①Adjust the vacuum degree of the vacuum tank; ②ensure uniform circumferential cooling of the pipe (uniform spraying/immersion); ③synchronize extrusion and haul-off speeds; ④calibrate the sizing sleeve dimensions.
Key Takeaway
Ovality = a synchronization problem of sizing + cooling + haul-off.
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