Deepwater installs a mini-gateway retrofit in the Gulf of Mexico
Deepwater installs a mini-gateway retrofit in the Gulf of Mexico.
During a July 2012 survey of Gulf of Mexico subsea equipment and pipelines, it was discovered that a crucial component of an umbilical control system was electrically isolated from cathodic protection. Deepwater was asked to design and manufacture a retrofittable electrical jumper system to connect the gateway to an adjacent structure (PLET), which would allow the umbilical component to "borrow" cathodic protection from the PLET's anodes.
INSTALLATION TIME: 60 HRS
Within 2 weeks, Deepwater designed, manufactured and shipped a custom RetroClamp and cable system to accomplish this task. The objective was to connect one RetroClamp to the pad-eye of the unprotected umbilical and another RetroClamp to the PLET tubular member below it (see photos). Once the ROV removed a shackle from the pad-eye, the installation of the RetroClamp system took only 10 minutes. The umbilical's CP potential shifted from -631mV (unprotected) to -841mV (protected) versus Ag/AgCl reference electrode.
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