Pipe Wrap® System: Leak Repair
Located in the Gulf of Mexico, an offshore Truss SPAR was experiencing significant degradation and needed an immediate repair. Three alternating stainless steel piping sections supplying seawater ballast for the SPAR were corroding in a variety of locations and had active leaks in all three lines.
There were approximately 39 leaking areas in both the pipe runs and tees on the three 10” lines (A, B, and C) that were all 14 feet above the deck. It was difficult to be sure of the exact number of leaks, as some areas were covered with a variety of clamps, tapes or screws.
The first step for the repair was to erect scaffolding and create a safe work area for the two-man crew. Alternating shutdowns were scheduled and the individual lines were depressurized one at a time. All existing repairs (clamps, tapes, screws, etc.) were then removed to enable sufficient preparation.
All three pipelines were prepared using a side grinder to remove rust and scale build up, bringing the pipe down to bare metal. Additionally, a solvent wipe was used prior to the application of epoxies.
On line A, the holes and anomalies were filled with epoxy. Then, an epoxy primer was applied circumferentially, and on an overlap repair zone axially by 3-4 inches. Next, 24 layers of Pipe Wrap® were applied. On lines B & C, after preparing the entire line, the holes and anomalies were filled with epoxy, then epoxy paste was applied from the 3 o’clock to the 9 o’clock position, as all previous leaks appeared to be in the bottom 180˚ of the piping. Finally, epoxy primer was applied to the remainder of the bare piping and finished with 24 layers of Pipe Wrap repair material.
The end user was able to successfully repair the offshore Truss SPAR and stop the active leaks, while the Pipe Wrap system helped extend the life of the pipeline.