Oil Casing pipe Thread Defects

Common defects and defects of oil casing thread


1, black top oil casing thread
2, broken wire
3, Burr
4, tremor
5, Marcos
6, the score line
7, pit, indentation
8, the standard thread height
9, flash
10, torn
11, camfered lack, cone failed
12, pitting thread
13, abnormal tube buckle