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Deepwater installs RetroPods™ and V-Strings™ in the Erawan gas field, Gulf of Thailand
Thirty-six RetroPods™ and two V-String™ monitoring systems installed on two platforms in the Gulf of Thailand
The entire project was completed in 60 hours using a team of saturation divers, and also marks the greatest depth yet at which RetroPods™ have been deployed on a platform.
Installation time: 60 hours
The RetroPods™ were shipped in kit form and assembled dockside by local crews provided by CUEL. Both platforms sit in 200 feet of seawater, making this the deepest RetroPod™ installation yet. When divers checked CP readings after installation, the results confirmed that both structures are well-protected, including areas farthest from the RetroPods™ resting on the seabed.
This confirms the RetroPods’ ability to sufficiently protect structures at greater depths without need for supplemental CP. The minimum pre-retrofit CP reading at -20 feet was -0.950mV; post-retrofit, it was -0.985mV. The minimum pre-retrofit CP reading at -200 feet was -0.959mV; post-retrofit, it was -1.009mV. V-String™ zinc reference electrodes were attached at a depth of 150 feet using RetroClamps™. The leads were run to monitoring devices mounted topside.
NOTE: Video from a similar project
Gallery
Retropod is lifted overboard
After the protectors for the booster anodes are removed, the crane hooks up to the slings provided with each Retropod.
Awaiting deployment
Retropods on back deck with pre-installed spacers to keep booster anodes upright.
Monitoring the cp levels
Deepwater installed V-String electrodes and ran them topside to a simple monitoring panel where the levels read can be tested with a multi-meter.
More information
Spotlight
CP simulation on North Sea platform
CP modeling was used to provide depolarization timeline
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