... with spool thread.PassedQualified2Crosslinking degree, %≥65(silane crosslinked HDPE)71.4Qualified3Longitudinal reversion, %≤31.1Qualified4Hydraulic Test1)20,12.0 MPa of ... of hoop stress,22h no seepage, no brokenPassedQualified4)95,4.6 MPa of hoop stress,165h no seepage, no ... brokenPassedQualified5)95,4.4 MPa of hoop stress,1000h no seepage, no brokenPassedQualified ...