As this is a tight fitted PE which was temporarily reduced by 10% of its original OD through a special die before lined into the old system, which the PE pipes resumed the original OD after release of tensile force.

• 由于这是紧配合的聚乙烯衬管，在放入原来管道之前，原外径暂时用专用模头减少10%25；当拉伸力释放后，聚乙烯管道恢复原有的外径尺寸。