The report reviews the research involved with Non-Destructive Examination (NDE) of composite repairs as applied to pipelines and piping. Four pipeline samples were evaluated each containing three repairs with an ‘open’ training section and two ‘blind’ sections (total of 12 repairs). Pipe defects included external corrosion wall loss and pitting represented by partial through-wall drilled holes. Application of the composite repairs, containing interlaminar defects and steel/composite debonding, was completed by four composite repair vendors. This included one carbon fiber and three glass fiber...
The report reviews the research involved with Non-Destructive Examination (NDE) of composite repairs as applied to pipelines and piping. Four pipeline samples were evaluated each containing three repairs with an ‘open’ training section and two ‘blind’ sections (total of 12 repairs). Pipe defects included external corrosion wall loss and pitting represented by partial through-wall drilled holes. Application of the composite repairs, containing interlaminar defects and steel/composite debonding, was completed by four composite repair vendors. This included one carbon fiber and three glass fiber repair systems. The scope included an underwater repair system. Pre-hydrotest inspections were carried out between September and December 2013. Following the pre-hydrotest inspections, the samples endured static and cyclic hydrotesting. Pressure testing was done sequentially together with strain gage monitoring for three of the four samples. Acoustic emission monitoring was also performed. Static hydrotests were done to 72% and 90% SMYS with 10 minute holds in between. This was followed by cyclically testing to 10,000 cycles. Post-hydrotest inspections were done to investigate any changes that may have occurred during the hydrotests.