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Failure Analysis for Slipping of φ177.8 mm × 10.36 mm N80Q LC Casing
Author(s): 
Pages: 209-211+214
Year: Issue:  4
Journal: Hot Working Technology

Keyword:  casingfailure analysisconnection strengthgalling;
Abstract: A slipping accident of 准177.8 × 10.36 mm N80Q EU casing was investigated. The failure analysis indicates that the coupling yield strength, yield strength and the tensile strength of the tube body can not meet the standard requirements. Because the casing pipe body strength is lower and the coupling tensile strength is higher, the material can not match appropriately. The lower plastic pipe body can cause yield, which can result in thread connection parts proning to galling, so the jointing strength reduces. Not qualified screw thread parameters and the poor anti-galling performance are the reasons for the failure of casing screw thread.
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