Defect assessment

The problem
During an intelligent pig inspection, an operator had discovered a circumferential defect at a girth weld. A smaller defect was also found accompanying the main defect.
Jee was requested to assess the defects and their interaction, and determine what effect they would have on the operational capability of the line in terms of pressure and temperature.

The solution
Jee performed a complex shape Level 2 defect pressure capacity and pipeline strength calculation, according to the principles of DNV-RP-F101. The defect was found not to compromise the safety of the pipeline at the current operating temperature and pressure.
Jee also calculated at what size the defect would make the pipeline unsafe. Recommendations were made such that the operator could assess whether the defect was liable to grow and become a danger to pipeline integrity.

The benefits
Jee provided confirmation to the operator that the defect was not compromising the integrity of their pipeline, thus allowing them to continue normal operations without requiring expensive repair procedures.
Additionally Jee provided recommendations such that they would be aware when the defect became a danger to pipeline integrity.
Jee was able to respond to the client’s urgent request in the timescale required.