ASI Group

Remote Grout Injections

During an annual inspection of the Ponce Deep Ocean Outfall, Ponce, Puerto Rico, leaks were identified in several joints. In the deepwater section of the outfall (115 m/376 ft. deep) the leaks were inaccessible from the outside since they were covered in grout mattresses. This repair required remotely operated vehicle (ROV) deployment for reasons of safety, cost efficiency, water depth and extreme distance from the nearest manhole.
ASI was contracted to develop and implement an effective repair method to seal the leaky joint. 

ASI successfully developed a patented Underwater Self-sealing Grout after research indicated there were no off-the-shelf grouting or mechanical technologies available to seal a leaky joint in a deep ocean outfall. The grout can be readily pumped through 305 m/1000 ft. of 2 cm/0.75 in. diameter hose without plugging, unlike “standard” commercial mixes with chemical additives. In-house development and testing of novel grout mixtures was accompanied by the design, fabrication and testing of an adapted removable grout form that was fitted around an ROV to set up, deliver and monitor the application of the new grouting material. ASI completed bench, pilot and full-scale system tests prior to successfully completing the repair of the leaking outfall pipe.

Canadian Patent No. 2,553,124

United States Patent No. 7,544,241 B2

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