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ROV Grouting Systems

ROV-Installed, Inflatable-Seal Stinger
This diverless system uses an ROV to connect a flexible-hose umbilical to subsea receptacles for grout injection and for grout packer inflation. The system eliminates fixed grout piping and packer inflation lines. To reduce ROV maneuvering and installation vessel moves, receptacles can be clustered at a convenient location on the structure. If the cluster is below the tops of the pile sleeves, non-return valves must be used to prevent grout backflow.

Inflatable-Seal Stinger
The inflatable-seal stinger has an unrestricted 2-inch bore and incorporates two replaceable rubber seal elements that are inflated via the umbilical after the stinger is stabbed. The inflated seals lock the stinger in the receptacle, permitting grout injection to proceed.

Packer Inflation
If grout packers are used, they are inflated via an umbilical inflation line that injects pressure through a port located between the two stinger seals.

Contingency Systems
Redundant receptacles are provided for packer inflation and grouting in the event of a problem with the primary system.

Advantages
   • Minimizes grout piping weight
   • Minimizes ROV and vessel movement
   • Can be used with any ROV
   • Eliminates grout lines above pile sleeves
   • Eliminates a grout packer inflation line to
     surface
   • Cuts cost of materials, fabrication

Sleeves Stinger Graphic


Stinger Receptacle Graphic

Operation
The ROV guides the stinger into the receptacle on top of the station. Compressed gas supplied from the surface through the umbilical inflates the stinger’s isolation seals, locking the stinger in place and isolating the packer-injection port. Gas pressure is then applied to inflate the grout packer; a check valve maintains the packer inflation pressure. The ROV then opens the ball valve above the stinger, and grouting commences. When grout placement is complete, the ROV closes the valve, the isolation seals are deflated, and the stinger is moved to another receptacle or retrieved to surface.

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